Skip to main content

Rescue karyotyping: a case series of array-based comparative genomic hybridization evaluation of archival conceptual tissue



Determination of fetal aneuploidy is central to evaluation of recurrent pregnancy loss (RPL). However, obtaining this information at the time of a miscarriage is not always possible or may not have been ordered. Here we report on “rescue karyotyping”, wherein DNA extracted from archived paraffin-embedded pregnancy loss tissue from a prior dilation and curettage (D&C) is evaluated by array-based comparative genomic hybridization (aCGH).


A retrospective case series was conducted at an academic medical center. Patients included had unexplained RPL and a prior pregnancy loss for which karyotype information would be clinically informative but was unavailable. After extracting DNA from slides of archived tissue, aCGH with a reduced stringency approach was performed, allowing for analysis of partially degraded DNA. Statistics were computed using STATA v12.1 (College Station, TX).


Rescue karyotyping was attempted on 20 specimens from 17 women. DNA was successfully extracted in 16 samples (80.0%), enabling analysis at either high or low resolution. The longest interval from tissue collection to DNA extraction was 4.2 years. There was no significant difference in specimen sufficiency for analysis in the collection-to-extraction interval (p = 0.14) or gestational age at pregnancy loss (p = 0.32). Eight specimens showed copy number variants: 3 trisomies, 2 partial chromosomal deletions, 1 mosaic abnormality and 2 unclassified variants.


Rescue karyotyping using aCGH on DNA extracted from paraffin-embedded tissue provides the opportunity to obtain critical fetal cytogenetic information from a prior loss, even if it occurred years earlier. Given the ubiquitous archiving of paraffin embedded tissue obtained during a D&C and the ease of obtaining results despite long loss-to-testing intervals or early gestational age at time of fetal demise, this may provide a useful technique in the evaluation of couples with recurrent pregnancy loss.


Recurrent pregnancy loss (RPL) is a common though poorly understood condition. Defined as two or more failed clinical pregnancies, RPL affects up to 5% of couples attempting to conceive [1, 2]. In addition to the physical burdens, RPL is often an emotionally and psychologically difficult diagnosis for these women and their partners. Diagnosing the cause of a pregnancy loss is important both to determine whether further interventions are indicated, as well as to provide a sense of closure to the patient and her partner.

Chromosomal abnormalities account for up to 75% of first trimester pregnancy losses [310]. Given this high frequency, a critical initial step in the evaluation of recurrent pregnancy loss is to perform cytogenetic analysis of the products of conception (POCs) in order to determine whether aneuploidy was the cause of the loss. If the pregnancy loss was due to aneuploidy, then the likelihood of recurrence returns to the age-adjusted baseline, which increases with advancing maternal age [11]. However, if aneuploidy was not the cause, a further work-up is indicated.

Traditionally, cytogenetic evaluation following a pregnancy loss is performed via Giemsa staining of metaphase spreads. This requires culturing cells obtained from freshly collected chorionic villi, and so POCs must be promptly placed in appropriate culture media before cell death occurs. These requirements create many situations in which conventional karyotyping may not be feasible. Examples include when the pregnancy loss occurred a significant time before the POCs could be placed in appropriate culture media (e.g. patients with a lengthened interval between the demise and the time of tissue collection or when tissue is passed at home or at a location where culturing could not be started), when there may not be the necessary culture media or situational awareness required to send the material for karyotyping (e.g. in the case of emergent dilation and curettage (D&C)) or when samples are lost in transit, become infected, or fail to grow during culture.

Due to the high likelihood of aneuploidy in cases of sporadic pregnancy loss, current recommendations by the American College of Obstetrics and Gynecology as well as the American Society for Reproductive Medicine are to obtain karyotype results only after the second or third loss [12]. Recent cost-analyses have supported this recommendation [13, 14]. Thus, the POCs from a first or second loss are often not sent for karyotyping, even following a D&C. However, if the patient goes on to have subsequent losses, particularly at earlier gestations precluding successful genomic analysis, the karyotypes from the earlier miscarriage would be informative. Therefore, there is a need to establish a standardized method for retrospectively retrieving cytogenetic information from previous pregnancy losses in a robust manner that could be readily employed in a clinical laboratory.

In the context of freshly collected POCs, array-based comparative genomic hybridization (aCGH) may be equally or even more informative than conventional karyotyping [1523]. When used in prenatal diagnosis and the evaluation of children with developmental delay, aCGH allows for the detection of copy number variants (CNVs) such as deletions and insertions with a 10-fold increased resolution compared with traditional karyotyping [2427].

Unlike prior approaches that required PCR amplification of extracted genomic DNA [28], an automated approach has successfully been utilized in tumor genotyping and cytogenetic analysis in oncology. In these cases, aCGH analysis of DNA extracted from paraffin-embedded tumor samples is frequently used, demonstrating the distinct advantage that this technology does not require live cells [29]. Here we sought to extend this approach to analysis of paraffin embedded POCs.

For the purpose of retrospectively or “rescue” karyotyping, we adapted aCGH analysis of DNA extracted from paraffin embedded tissue, a technique widely used in analysis of tumor samples, to analysis of paraffin embedded POCs. This technique provides the potential to obtain detailed cytogenetic information from previously collected paraffin-embedded conceptual tissue. Based on our findings, we propose this technique as a method of obtaining useful cytogenetic information for patients who require karyotype results but have had either no attempts or failed attempts at conventional karyotyping at the time of prior losses.


Patient selection

This was a retrospective case series carried out at an academic medical center. Patients received care under the auspice of the Program for Early and Recurrent Pregnancy Loss (PEARL) at the Albert Einstein College of Medicine, Bronx NY, and were included if they had RPL and had an indication for karyotyping of a prior loss for which traditional cytogenetic evaluation was either not attempted or was unsuccessful. All patients who met these criteria during the study period were included. In each case, the cost of testing was covered by the patient’s insurance. At the time when the pregnancy loss was diagnosed, gestational age was estimated using fetal biometry. Patients underwent D&C or MVA at the discretion of the provider. The research was reviewed and exempted by the Institutional Review Board (2013-2212).

Tissue collection

In each case, DNA was extracted from twenty slides of 5 μM thickness obtained from the original paraffin embedded blocks produced for routine pathology examination to confirm POC samples at the time of the original D&C. If DNA was of sufficient quality and quantity, aCGH analysis was performed on high-resolution arrays. This approach enables the detection of CNVs as small as 1 Kb (average 7.5 Kb). However, for purposes of detecting simple aneuploidy (the most likely genetic cause for pregnancy loss), such high resolution is not necessary and so if DNA was of poorer quality or quantity (<500 ng measured by Qubit® fluorometric analysis, Life Technologies) a lower resolution analysis was performed. This low resolution analysis could detect CNVs of 17 Kb, 100-fold smaller than the range that would be needed to diagnose cases of aneuploidy.

DNA extraction

A slide from the formalin-fixed paraffin-embedded (FFPE) block was reviewed by a pathologist and the area of fetal tissue circled. Fetal or chorionic villus cells were macro-dissected from this circled area to reduce maternal cell contamination (MCC) and subjected to DNA extraction using the QIAamp FFPE DNA extraction kit (Qiagen, Valencia, CA). The gDNA concentration was measured using Nanodrop 1000 (Fisher, Waltham, Massachusetts) and requantified by Qubit 2.0 Fluorometer (Life technologies, Carlsbad, CA).


Cases were run on 2 × 400 K CGH arrays (Agilent Technologies) for high resolution testing. Where DNA was insufficient for high resolution testing, cases with less than 300 ng DNA were run on 4 × 180 K CGH array (Agilent Technologies) for low-resolution testing. Five hundred ng genomic DNA from patients and the reference were digested with AluI and RsaI (Invitrogen) for 2 hours at 37°C and labeled using Agilent enzymatic labeling kit according to manufacturer’s instructions. Patient and reference DNA were labeled with Cy5 and Cy3, respectively. Unincorporated nucleotides were removed using Amicon Ultra-0.5 30 K filter column (Millipore, Billerica, MA). Patient DNA and reference DNA were co-hybridized to arrays for 40 hours at 65°C in a rotator (Agilent Technologies) at 20 rpm. The arrays were then washed with Agilent wash buffer and scanned using an Agilent Microarray Scanner. Scanned data from aCGH was extracted using Feature Extraction (version 10.10; Agilent Technologies). Extracted data was analyzed using Agilent Genomic Workbench (version 7.0; Agilent Technologies) and Agilent CytoGenomics (version 2.0; Agilent Technologies). Genomic copy number changes were identified using Aberration Detection Method 1 (ADM-1), an algorithm implemented in Genomic Workbench (Agilent Technologies) and visual evaluation. If MCC was suspected based on results, it was reported as such. In cases where testing was performed for MCC, a rate of approximately 5% was noted, which would be unlikely to impact array results. Testing is validated in-house with known positives and negatives. These methods have been previously reported [21, 30].

Statistical analysis

Statistical evaluation was performed using STATA v12.1 (College Station, TX). It was determined a priori that to detect a 60% success rate in rescue karyotyping in our sample compared to the reported values of 85% or greater in the largest studies [24, 25], with α = 0.05 and 80% power, at least 20 specimens were needed. Descriptive statistics were computed, and are presented as mean ± SD for normally-distributed and median [inter-quartile range (IQR)] for non-normally-distributed continuous data; categorical data are presented as n (%). Bivariate analysis was performed using Mann–Whitney U and Kruskal Wallis tests for continuous data, and the Pearson’s chi-squared and Fisher’s exact tests for categorical data.



Seventeen women, providing 20 samples, met criteria over a 12-month period (Table 1). The median maternal age was 33 [30-36], while the median paternal age was 35 [30-36]. The median gravity was 7 [4-9], and the median parity was 2 [0-3]. Of these specimens, the median gestational age at the time of the pregnancy loss was 8 weeks [7-10].

Table 1 Baseline demographic and clinical background information of patients and specimens

Among the 17 women, 13 (76.5%) had multiple losses without any prior karyotype performed, while 4 (23.5%) had had cytogenetic evaluation of at least a single prior loss. Three patients in the latter category had prior traditional karyotyping attempts that had been unsuccessful, due to failed growth in culture or being lost in transport.

Of the 20 specimens, information regarding the interval between diagnosis of demise and tissue collection was available for 9 (45.0%) specimens; of these, the median interval was 2 days [0-2]. One specimen (5.0%) was passed spontaneously, while 16 (80.0%) were from a D&C and 3 (15.0%) from manual vacuum aspiration (MVA).

aCGH testing outcome

Eleven specimens (55.0%) were run at full resolution without difficulty (Table 2). If sufficient DNA for traditional analysis was not available, lower-resolution testing was performed. Five (25.0%) samples were run at low resolution; and 4 samples (20.0%) were insufficient for evaluation. In all, results were generated for the majority of cases, 16 of 20 (80.0%).

Table 2 aCGH results

The longest duration between documented loss of fetal cardiac activity and collection of tissue that resulted in a successful karyotype analysis was 14 days, though this information was not documented for many patients and is often inaccurate due to unknown time of fetal demise. The longest duration between collection of tissue and DNA extraction that resulted in a successful karyotype analysis was 4.2 years (1562 days).

Of the 16 specimens that had sufficient DNA for aCGH analysis, 8 (50.0%) were euploid, and 8 (50.0%) showed copy number variants potentially responsible for the pregnancy loss (Table 2, Figure 1). While an instance of trisomy likely explains a loss, the clinical significance of other findings, such as unclassified CNVs, remains to be determined. As a general rule, the significance will correlate with the amount of genomic material included, and the number and significance of the genes within that locus. The three non-mosaic trisomies were all from cases where the maternal age was 40 years or greater.

Figure 1
figure 1

Selected Array CGH Results. (A) Specimen 12. Red arrow shows gain of a copy of chromosome 21. (B) Specimen 11. Red arrows show mosaic gains of chromosome 13 and chromosome X, green arrow shows a mosaic loss of chromosome Y (a female reference DNA was used in this case). (C-E) Specimen 20. C shows the whole genome view of this unbalanced translocation, with the green arrow showing a partial loss of 4p and the red arrow showing a partial gain of 5q. D shows a whole chromosome view of chromosome 4 with a normal case adjacent for comparison to highlight the partial loss of 4p, seen where the DNA signal (in blue) deviates leftward. E shows a chromosome view of chromosome 5, also with a normal case adjacent for comparison, to highlight the partial gain in 5q where the DNA signal (in blue) deviates rightward.

DNA quality data

The DNA integrity, including both quality and quantity, was reflected by the array QC metrics, Distribution of Log2 Ratio Spread (DLRS) (Table 2). Three cases (18.75%) with DLRS <0.3 were listed as “good”; 10 cases (62.5%) with DLRS between 0.3 and 0.5 were listed as “poor”; and 3 (18.75%) with DLRS >0.5 as “very poor”. The mean DLRS was 0.42 ± 0.16.

Predictors of aCGH success

Comparing those samples found to be sufficient for high-resolution aCGH, sufficient for low-resolution aCGH or insufficient, there was no difference in the median gestational age at time of pregnancy loss (8 [7-16] v 9 [8-10] v 8 [7,8], respectively), p = 0.32 (Table 3). Similarly, there was no significant difference between the median interval between specimen collection and time to processing (114 days [63-264] v 313 days [229-545] v 239 days [162-1770], respectively), p = 0.14. Nor were there any significant differences in the method of obtaining the tissue (p = 0.59), the median interval between demise and collection (p = 0.33) or the percentage of abnormal findings (p > 0.99). Insufficient results were reported faster than tests generating results at low- or high-resolution (p = 0.03).

Table 3 Specimen characteristics by test outcome


Rescue karyotyping using aCGH on DNA extracted from paraffin embedded tissue provided clinically relevant fetal cytogenetic information in 80% of patients who had undergone either failed or no attempts at conventional karyotyping in prior losses. Though most of these abnormalities could be detected with conventional karyotyping, when that testing is unavailable for any reason, rescue karyotyping provides a critical alternative method to uncover the genomic information. While other technologies, such as fluorescence in situ hybridization (FISH), quantitative fluorescence polymerase chain reaction (QF-PCR), and sub-telomeric multiplex ligation-dependent probe amplification have been utilized for genetic evaluation, these methods only assay targets designated a priori, and not the entire genome. Microdissection of chorionic villi from a single slide followed by whole genome amplification (WGA) is technically challenging and not amenable to routine application in a clinical laboratory setting [28].

Our ability to attain this information relies on the critical fact that unlike conventional karyotyping, aCGH testing can be performed from paraffin embedded tissue blocks that are routinely prepared and archived following a D&C as part of standard hospital protocol. The process requires minimal effort from the provider, aside from procuring these slides and getting them sent for testing at a qualified center. As such, once protocols have been established for coordinating the movement of specimen slides from the original facility to the testing facility and for communicating the results to the ordering physician, the process is quite simple. This simplicity lends itself to the possibility of increased utilization in patients with RPL.

aCGH is also able to detect smaller copy number variants compared to traditional karyotyping, and other studies have already established a higher pickup rate with aCGH. In a recent study by Reddy et al. aCGH yielded results more often than traditional karyotyping (87.4% v 70.5%, p < 0.001) and provided better detection of aneuploidy or pathogenic copy-number variants (8.3 v 5.8%, p = 0.007) [25]. Despite the small number in this case series, our success rate at obtaining results is on par with these results, and we have been able to utilize this technology to obtain genomic information that would otherwise not have been available. More widespread use of this technology may expand our knowledge about CNV associated with unexplained RPL. This could provide insights to both patients and providers, and may also hone our precision in using pre-implantation genetic diagnosis and screening methods to assist these patients in completing euploid pregnancies. This information can be helpful in determining whether a more extensive and costly RPL evaluation is necessary and may also provide a definitive explanation for a pregnancy loss for those patients who require it. However, CNVs of undetermined clinical significance can also be discovered and these may not play a causal role in the miscarriage.

Though current institutional rates for traditional karyotyping is $820, and microarray testing $1600-1750 depending on resolution, this cost disparity only underscores the utility of it as described here, as a rescue method when traditional testing fails or is not performed. Further, we anticipate the cost for microarray testing to continue to fall as technology advances, while the cost of traditional G-band karyotyping will likely remain constant or even increase due to labor costs. Additionally, the patient’s insurance typically covers microarray testing in this context; this was the case for all of the patients in our cohort. In summary, aCGH testing holds potential for cost-effective use in rescue karyotyping by enabling cytogenetic evaluation of archived fetal tissue. This can provide physicians and patients with clinically relevant cytogenetic information on prior pregnancy losses. The results of this testing can help guide a physician’s decision to pursue a RPL evaluation and can provide sense of closure to patients.



Array-based comparative genomic hybridization


Copy number variant


Distribution of log2 ratio spread


Dilation & curettage


Formalin-fixed paraffin-embedded


Fluorescence in-situ hybridization


Inter-quartile range


Manual vacuum aspiration


Products of conception


Quantitative fluorescence polymerase chain reaction


Recurrent pregnancy loss


Whole genome amplification.


  1. Stirrat GM: Recurrent miscarriage. Lancet. 1990, 336: 673-675. 10.1016/0140-6736(90)92159-F.

    Article  CAS  PubMed  Google Scholar 

  2. Practice Committee of the American Society for Reproductive Medicine: Definitions of infertility and recurrent pregnancy loss: a committee opinion. Fertil Steril. 2013, 99: 63-

    Article  Google Scholar 

  3. Lin CC, De Braekeleer M, Jamro H: Cytogenetic studies in spontaneous abortion: the Calgary experience. Can J Genet Cytol. 1985, 27: 565-570.

    Article  CAS  PubMed  Google Scholar 

  4. Nagaishi M, Yamamoto T, Iinuma K, Shimomura K, Berend SA, Knops J: Chromosome abnormalities identified in 347 spontaneous abortions collected in Japan. J Obstet Gynaecol Res. 2004, 30: 237-241. 10.1111/j.1447-0756.2004.00191.x.

    Article  PubMed  Google Scholar 

  5. Ogasawara M, Aoki K, Okada S, Suzumori K: Embryonic karyotype of abortuses in relation to the number of previous miscarriages. Fertil Steril. 2000, 73: 300-304. 10.1016/S0015-0282(99)00495-1.

    Article  CAS  PubMed  Google Scholar 

  6. Simpson JL: Causes of fetal wastage. Clin Obstet Gynecol. 2007, 50: 10-30. 10.1097/GRF.0b013e31802f11f6.

    Article  PubMed  Google Scholar 

  7. Stern JJ, Dorfmann AD, Gutierrez-Najar AJ, Cerrillo M, Coulam CB: Frequency of abnormal karyotypes among abortuses from women with and without a history of recurrent spontaneous abortion. Fertil Steril. 1996, 65: 250-253.

    CAS  PubMed  Google Scholar 

  8. Sullivan AE, Silver RM, LaCoursiere DY, Porter TF, Branch DW: Recurrent fetal aneuploidy and recurrent miscarriage. Obstet Gynecol. 2004, 104: 784-788. 10.1097/01.AOG.0000137832.86727.e2.

    Article  PubMed  Google Scholar 

  9. Fritz B, Hallermann C, Olert J, Fuchs B, Bruns M, Aslan M, Schmidt S, Coerdt W, Muntefering H, Rehder H: Cytogenetic analyses of culture failures by comparative genomic hybridisation (CGH)-Re-evaluation of chromosome aberration rates in early spontaneous abortions. Eur J Hum Genet. 2001, 9: 539-547. 10.1038/sj.ejhg.5200669.

    Article  CAS  PubMed  Google Scholar 

  10. Philipp T, Philipp K, Reiner A, Beer F, Kalousek DK: Embryoscopic and cytogenetic analysis of 233 missed abortions: factors involved in the pathogenesis of developmental defects of early failed pregnancies. Hum Reprod. 2003, 18: 1724-1732. 10.1093/humrep/deg309.

    Article  CAS  PubMed  Google Scholar 

  11. Stephenson MD, Awartani KA, Robinson WP: Cytogenetic analysis of miscarriages from couples with recurrent miscarriage: a case–control study. Hum Reprod. 2002, 17: 446-451. 10.1093/humrep/17.2.446.

    Article  CAS  PubMed  Google Scholar 

  12. Practice Committee of the American Society for Reproductive Medicine: Evaluation and treatment of recurrent pregnancy loss: a committee opinion. Fertil Steril. 2012, 98: 1103-1111.

    Article  Google Scholar 

  13. Bernardi LA, Plunkett BA, Stephenson MD: Is chromosome testing of the second miscarriage cost saving? A decision analysis of selective versus universal recurrent pregnancy loss evaluation. Fertil Steril. 2012, 98: 156-161. 10.1016/j.fertnstert.2012.03.038.

    Article  PubMed  Google Scholar 

  14. Foyouzi N, Cedars MI, Huddleston HG: Cost-effectiveness of cytogenetic evaluation of products of conception in the patient with a second pregnancy loss. Fertil Steril. 2012, 98: 151-155. 10.1016/j.fertnstert.2012.04.007.

    Article  PubMed  Google Scholar 

  15. Gao J, Liu C, Yao F, Hao N, Zhou J, Zhou Q, Zhang L, Liu X, Bian X, Liu J: Array-based comparative genomic hybridization is more informative than conventional karyotyping and fluorescence in situ hybridization in the analysis of first-trimester spontaneous abortion. Mol Cytogenet. 2012, 5: 33-10.1186/1755-8166-5-33.

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  16. Raca G, Artzer A, Thorson L, Huber S, Modaff P, Laffin J, Pauli RM: Array-based comparative genomic hybridization (aCGH) in the genetic evaluation of stillbirth. Am J Med Genet A. 2009, 149A: 2437-2443. 10.1002/ajmg.a.33083.

    Article  CAS  PubMed  Google Scholar 

  17. Harris RA, Ferrari F, Ben-Shachar S, Wang X, Saade G, Van Den Veyver I, Facchinetti F, Aagaard-Tillery K: Genome-wide array-based copy number profiling in human placentas from unexplained stillbirths. Prenat Diagn. 2011, 31: 932-944. 10.1002/pd.2817.

    Article  PubMed Central  PubMed  Google Scholar 

  18. Benkhalifa M, Kasakyan S, Clement P, Baldi M, Tachdjian G, Demirol A, Gurgan T, Fiorentino F, Mohammed M, Qumsiyeh MB: Array comparative genomic hybridization profiling of first-trimester spontaneous abortions that fail to grow in vitro. Prenat Diagn. 2005, 25: 894-900. 10.1002/pd.1230.

    Article  CAS  PubMed  Google Scholar 

  19. Menten B, Swerts K, Delle Chiaie B, Janssens S, Buysse K, Philippe J, Speleman F: Array comparative genomic hybridization and flow cytometry analysis of spontaneous abortions and mors in utero samples. BMC Med Genet. 2009, 10: 89-

    Article  PubMed Central  PubMed  Google Scholar 

  20. Robberecht C, Schuddinck V, Fryns JP, Vermeesch JR: Diagnosis of miscarriages by molecular karyotyping: benefits and pitfalls. Genet Med. 2009, 11: 646-654. 10.1097/GIM.0b013e3181abc92a.

    Article  PubMed  Google Scholar 

  21. Schaeffer AJ, Chung J, Heretis K, Wong A, Ledbetter DH, Lese Martin C: Comparative genomic hybridization-array analysis enhances the detection of aneuploidies and submicroscopic imbalances in spontaneous miscarriages. Am J Hum Genet. 2004, 74: 1168-1174. 10.1086/421250.

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  22. Shimokawa O, Harada N, Miyake N, Satoh K, Mizuguchi T, Niikawa N, Matsumoto N: Array comparative genomic hybridization analysis in first-trimester spontaneous abortions with “normal” karyotypes. Am J Med Genet A. 2006, 140: 1931-1935.

    Article  PubMed  Google Scholar 

  23. Zhang YX, Zhang YP, Gu Y, Guan FJ, Li SL, Xie JS, Shen Y, Wu BL, Ju W, Jenkins EC, Brown WT, Zhong N: Genetic analysis of first-trimester miscarriages with a combination of cytogenetic karyotyping, microsatellite genotyping and arrayCGH. Clin Genet. 2009, 75: 133-140. 10.1111/j.1399-0004.2008.01131.x.

    Article  CAS  PubMed  Google Scholar 

  24. Wapner RJ, Martin CL, Levy B, Ballif BC, Eng CM, Zachary JM, Savage M, Platt LD, Saltzman D, Grobman WA, Klugman S, Scholl T, Simpson JL, McCall K, Aggarwal VS, Bunke B, Nahum O, Patel A, Lamb AN, Thom EA, Beaudet AL, Ledbetter DH, Shaffer LG, Jackson L: Chromosomal microarray versus karyotyping for prenatal diagnosis. N Engl J Med. 2012, 367: 2175-2184. 10.1056/NEJMoa1203382.

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  25. Reddy UM, Page GP, Saade GR, Silver RM, Thorsten VR, Parker CB, Pinar H, Willinger M, Stoll BJ, Heim-Hall J, Varner MW, Goldenberg RL, Bukowski R, Wapner RJ, Drews-Botsch CD, O'Brien BM, Dudley DJ, Levy B, NICHD Stillbirth Collaborative Research Network: Karyotype versus microarray testing for genetic abnormalities after stillbirth. N Engl J Med. 2012, 367: 2185-2193. 10.1056/NEJMoa1201569.

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  26. Hillman SC, Pretlove S, Coomarasamy A, McMullan DJ, Davison EV, Maher ER, Kilby MD: Additional information from array comparative genomic hybridization technology over conventional karyotyping in prenatal diagnosis: a systematic review and meta-analysis. Ultrasound Obstet Gynecol. 2011, 37: 6-14. 10.1002/uog.7754.

    Article  CAS  PubMed  Google Scholar 

  27. Miller DT, Adam MP, Aradhya S, Biesecker LG, Brothman AR, Carter NP, Church DM, Crolla JA, Eichler EE, Epstein CJ, Faucett WA, Feuk L, Friedman JM, Hamosh A, Jackson L, Kaminsky EB, Kok K, Krantz ID, Kuhn RM, Lee C, Ostell JM, Rosenberg C, Scherer SW, Spinner NB, Stavropoulos DJ, Tepperberg JH, Thorland EC, Vermeesch JR, Waggoner DJ, Watson MS, et al: Consensus statement: chromosomal microarray is a first-tier clinical diagnostic test for individuals with developmental disabilities or congenital anomalies. Am J Hum Genet. 2010, 86: 749-764. 10.1016/j.ajhg.2010.04.006.

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  28. Bell KA, Van Deerlin PG, Feinberg RF, du Manoir S, Haddad BR: Diagnosis of aneuploidy in archival, paraffin-embedded pregnancy-loss tissues by comparative genomic hybridization. Fertil Steril. 2001, 75: 374-379. 10.1016/S0015-0282(00)01703-9.

    Article  CAS  PubMed  Google Scholar 

  29. Tapper J, Butzow R, Wahlstrom T, Seppala M, Knuutila S: Evidence for divergence of DNA copy number changes in serous, mucinous and endometrioid ovarian carcinomas. Br J Cancer. 1997, 75: 1782-1787. 10.1038/bjc.1997.304.

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  30. Li MM, Nimmakayalu MA, Mercer D, Andersson HC, Emanuel BS: Characterization of a cryptic 3.3 Mb deletion in a patient with a ‘balanced t(15;22) translocation’ using high density oligo array CGH and gene expression arrays. Am J Med Genet A. 2008, 146: 368-375.

    Article  PubMed Central  Google Scholar 

Download references


Institutional and NIH (NICHD HD068546) support. Portions of this research were presented as an oral presentation at the Annual Meeting of the American Society for Reproductive Medicine in Boston, MA on October 16, 2013. We would like to thank Irene Forest, RN, Jessica Jordan, RN, and Laura Lodico, RN, for their invaluable efforts in managing specimen requisition and transport, as well as Jenna Friedenthal for editing assistance.

Author information

Authors and Affiliations


Corresponding author

Correspondence to Zev Williams.

Additional information

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

RK performed the data and statistical analysis and drafted the manuscript. ML, JS and AK carried out the molecular studies. ZW conceived and designed the experiments and helped to draft the manuscript. All authors read and approved the final manuscript.

Authors’ original submitted files for images

Below are the links to the authors’ original submitted files for images.

Authors’ original file for figure 1

Rights and permissions

Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver ( ) applies to the data made available in this article, unless otherwise stated.

Reprints and permissions

About this article

Cite this article

Kudesia, R., Li, M., Smith, J. et al. Rescue karyotyping: a case series of array-based comparative genomic hybridization evaluation of archival conceptual tissue. Reprod Biol Endocrinol 12, 19 (2014).

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: