Skip to main content

Discontinuation of rLH two days before hCG may increase the number of oocytes retrieved in IVF



Administration of recombinant luteinizing hormone (rLH) in controlled ovarian hyperstimulation may benefit a subpopulation of patients. However, late follicular phase administration of high doses of rLH may also reduce the size of the follicular cohort and promote monofollicular development.


To determine if rLH in late follicular development had a negative impact on follicular growth and oocyte yield, IVF patients in our practice who received rFSH and rLH for the entire stimulation were retrospectively compared with those that had the rLH discontinued at least two days prior to hCG trigger.


The two groups had similar baseline characteristics before stimulation with respect to age, FSH level and antral follicle count. However, the group which had the rLH discontinued at least two days prior to their hCG shot, had a significantly higher number of oocytes retrieved, including a higher number of MII oocytes and number of 2PN embryos.


When using rLH for controlled ovarian hyperstimulation, administering it from the start of stimulation and stopping it in the late follicular phase, at least two days prior to hCG trigger, may increase oocyte and embryo yield.


The precise benefit and use of recombinant luteinizing hormone (rLH) is still debated. It is unclear which subpopulation benefits the most (e.g. poor responders, extreme pituitary suppression, patients with anovulation). Routine administration of rLH in antagonist cycles may increase the peak serum E2 level but did not increase the number of oocytes retrieved or increase IVF pregnancy rates in one large randomized controlled trial [1]. A recent case-control study however did show a significant increase in implantation rates when rLH was used with antagonist cycles [2]. Adding rLH after day 6 of stimulation in a favorable prognosis population does not seem to improve stimulation or pregnancy rates either [3, 4]. However, when an undesirable response occurs after initial stimulation with FSH alone, adding rLH rather than increasing the FSH dose may increase the number of oocytes retrieved [5] and possibly the pregnancy rate per transfer [6]. The optimal dose and timing of rLH in controlled ovarian hyperstimulation is also unclear. One efficacy study showed an increased pregnancy rate with 75 IU vs. 37.5 IU daily (31% vs. 21% respectively) [7].

While the addition of rLH may increase response in COH, very high doses of rLH (660 IU/day) in anovulatory women, who are at particular risk of ovarian hyperstimulation, may promote the growth of a single dominant follicle [8], thereby reducing her risk for ovarian hyperstimulation syndrome. It has therefore been hypothesized that high dose rLH supplementation may reduce the size of the developing follicular cohort. Late follicular phase administration of rLH in doses of 225-450 IU/day has also shown to minimize the number of developing follicles in a smaller earlier study [9].

If poor responders potentially benefit from the addition of rLH but late follicular phase administration reduces the total number of growing midsize follicles, we hypothesized that stopping rLH in late follicular development would increase the number of oocytes obtained at retrieval. We performed a retrospective review of IVF patients in our practice that were stimulated with both rFSH and rLH to determine if stopping the rLH at least two days prior to hCG trigger increased the number of oocytes retrieved.


Study design

Patients who received rLH in an IVF cycle at our clinic between 2005-2007 were identified for chart review after IRB approval. The two groups were assessed for age, maximum FSH level, antral follicle count (AFC), type of stimulation (Lupron microdose co-flare versus Lupron down regulation protocol), whether cancellation occurred for poor response, length of stimulation, daily FSH and rLH dose, and peak estradiol (E2) and progesterone (P4) levels.

Patients on GnRH antagonists were excluded. At our center, a microdose co-flare is preceded by luteal estradiol patches 0.1 mg applied every other day starting on day 20 of the prior cycle. Lupron 20 units BID is then started on day 2 of the cycle, at a concentration of 40 mcg/0.2 mL, and continued until day of hCG. The down regulation protocol is started on day 21 of the preceding cycle, initially at a dose of 20 units a day (1 mg/0.2 mL) until down regulation is achieved. The dose is then lowered to 10 units a day until day of hCG. Patients are generally triggered with urinary hCG 10,000 units when the lead follicle is >20 mm, or two are greater than 18 mm, with estradiol levels at approximately 200 pg/mL per follicle, preferably on day 10 of stimulation.

Study groups

Both groups started stimulation with both rFSH and rLH. The subjects were divided into two groups: (1) those that had rLH stopped two or more days prior to hCG (with only rFSH for late follicular development), and (2) those that received rFSH and rLH until the day of hCG trigger.

Outcome variables

Outcomes of interest included the rate of midsize follicular growth (mm/day as measured by ultrasound), number of oocytes retrieved (total and MII), number of 2PNs after fertilization, number of grade 1 embryos available on day 3 of development, the number of embryos available for cryopreservation on day 3, the pregnancy rate as a measure of both positive beta hCG per cycle start and clinical pregnancy by ultrasound per cycle start. The vast majority of our cycles at our center involve a cleavage stage embryo transfer on day 2 or 3, therefore no blastocyst data is available.

Statistical analysis

The variables were assessed for distribution and considered reasonably normally distributed, therefore continuous variables were compared with a two tailed unpaired t-test, and proportions by Chi-square analysis or in cases of very small numbers, a Fisher's exact test. Statistical analysis was performed with SAS v9.1. A p-value of < 0.05 was considered statistically significant.


56 patients were included in the study. Table 1 demonstrates that the two groups were similar with respect to age, day 3 FSH level, antral follicle count (AFC), type of stimulation and cancellation rate. These characteristics were also not significant among the patients who proceeded to egg retrieval. While the two groups were similar to each other, they were both in poor prognosis categories: age = 37, FSH > 8 mIU/mL, and AFC < 12, since the majority of good prognosis patients at our clinic receive FSH alone. Consequently, nearly half of the stimulations were with short protocol co-flares, with a significant rate of cancellation (21-28%). The two groups had similar lengths of stimulation, daily FSH dose, and peak serum estradiol and progesterone levels. However, the group which received rLH throughout the entire stimulation (group 2), did have a small but significantly higher daily rLH dose (119 IU/day vs. 97 IU/day, p = 0.038).

Table 1 Subgroups baseline characteristics and outcomes

Group 1 (rLH discontinued two or more days prior to hCG trigger) had a significantly higher number of retrieved oocytes (11.4 vs. 7.6, p = 0.041), metaphase II oocytes (MIIs) (8.7 vs 4.7, p = 0.019) and pronuclear stage embryos (2PNs) after one day of culture (6.8 vs 3.5, p = 0.006). Group 1 also had a greater number of embryos for cryopreservation but this was not statistically significant. Clinical pregnancy rates were identical in the two groups.


Discontinuing rLH in late follicular development (at least two days prior to hCG) may increase the number of oocytes, MIIs and 2PNs in poor prognosis patients. While this was demonstrated in this preliminary, small, retrospective study, a larger prospective trial may determine whether this improves pregnancy rates in this subpopulation of IVF patients. It is likely that the use of rLH in an unselected population confers no benefit in live birth rates as demonstrated by a meta analysis involving 701 patients [10]. This was also demonstrated in a recent study of normal responders who received rLH in the early follicular phase [11]. However, it is possible that baseline or stimulation serum LH levels may help determine which group if any benefits from rLH supplementation (and possibly when during the stimulation). One study performed with oocyte donors found rLH was only beneficial in donors with serum LH levels < 1 IU/l at the start of stimulation [12].


When administering rLH at the beginning of controlled ovarian hyperstimulation for a poor responder, stopping the rLH and continuing FSH stimulation alone at least two days prior to hCG trigger may increase the oocyte yield at egg retrieval, possibly resulting in more MII oocytes and 2PN embryos for the patient.

Authors' information

JBS is an Assistant Professor of Reproductive Endocrinology & Infertility and the Director of the Donor Egg Program at Emory University in Atlanta, GA. ASC is an Assistant Professor of Reproductive Endocrinology & Infertility at Emory University. SDC is an Assistant Professor of Reproductive Endocrinology & Infertility and the director of the Donor Egg and Fertility Preservation Programs at Duke University in Durham, NC. DRS is an Associate Professor and Division Director of Reproductive Endocrinology & Infertility, and the IVF director at Emory University.


  1. Cedrin-Durnerin I, Grange-Dujardin D, Laffy A, Parneix I, Massin N, Galey J, Theron L, Wolf JP, Conord C, Clement P, Jayot S, Hugues JN: Recombinant human LH supplementation during GnRH antagonist administration in IVF/ICSI cycles: a prospective randomized study. Hum Reprod. 2004, 19: 1979-1984. 10.1093/humrep/deh369.

    Article  CAS  PubMed  Google Scholar 

  2. Franco JG, Baruffi RL, Oliveira JB, Mauri AL, Petersen CG, Contart P, Felipe V: Effects of recombinant LH supplementation to recombinant FSH during induced ovarian stimulation in the GnRH-agonist protocol: a matched case-control study. Reprod Biol Endocrinol. 2009, 7: 58-10.1186/1477-7827-7-58.

    Article  PubMed Central  PubMed  Google Scholar 

  3. Marrs R, Meldrum D, Muasher S, Schoolcraft W, Werlin L, Kelly E: Randomized trial to compare the effect of recombinant human FSH (follitropin alfa) with or without recombinant human LH in women undergoing assisted reproduction treatment. Reprod Biomed Online. 2004, 8: 175-182.

    Article  CAS  PubMed  Google Scholar 

  4. Nyboeandersen A, Humaidan P, Fried G, Hausken J, Antila L, Bangsbøll S, Rasmussen PE, Lindenberg S, Bredkjaer HE, Meinertz H, Nordic LH, study group: Recombinant LH supplementation to recombinant FSH during the final days of controlled ovarian stimulation for in vitro fertilization. A multicentre, prospective, randomized, controlled trial. Hum Reprod. 2008, 23 (2): 427-434. 10.1093/humrep/dem317.

    Article  CAS  PubMed  Google Scholar 

  5. DePlacido G, Alviggi C, Perino A, Strina I, Lisi F, Fasolino A, De Palo R, Ranieri A, Colacurci N, Mollo A, on behalf of the Italina Collaborative Group on Recombinant Human Luteinizing Hormone: Recombinant human LH supplementation versus recombinant human FSH (rFSH) step-up protocol during controlled ovarian stimulation in normogonadotrophic women with initial inadequate ovarian response to rFSH. A multicentre, prospective, randomized controlled trial. Hum Reprod. 2005, 20: 390-396. 10.1093/humrep/deh625.

    Article  CAS  Google Scholar 

  6. Perraretti AP, Gianaroli L, Magli MC, D'angelo A, Farfalli V, Montanaro N: Exogenous luteinizing hormone in controlled ovarian hyperstimulation for assisted reproduction techniques. Fertil Steril. 2004, 82: 1521-1526. 10.1016/j.fertnstert.2004.06.041.

    Article  Google Scholar 

  7. Lisi F, Rinaldi L, Fishel S, Caserta D, Lisi R, Campbell A: Evaluation of two doses of recombinant luteinizing hormone supplementation in an unselected group of women undergoing follicular stimulation for in vitro fertilization. Fertil Steril. 2005, 83: 309-315. 10.1016/j.fertnstert.2004.07.969.

    Article  CAS  PubMed  Google Scholar 

  8. Hugues JN, Soussis J, Calderon I, Balasch J, Anderson RA, Romeu A, on behalf of the Recombinant LH Study Group: Does the addition of recombinant LH in WHO group II anovulatory women over-responding to FSH treatment reduce the number of developing follicles? A dose-finding study. Hum Reprod. 2005, 20: 629-635. 10.1093/humrep/deh682.

    Article  CAS  PubMed  Google Scholar 

  9. Loumaye E, Engrand P, Shoham Z, Hillier SG, Baird DT, on behalf of the Recombinant LH Study Group: Clinical evidence for an LH 'ceiling' effect induced by administration of recombinant human LH during the late follicular phase of stimulated cycles in World Health Organization type I and II anovulation. Hum Reprod. 2003, 18: 314-322. 10.1093/humrep/deg066.

    Article  CAS  PubMed  Google Scholar 

  10. Kolibianakis EM, Kalogeropoulou L, Griesinger G, Papanikolaou EG, Papadimas J, Bontis J, Tarlatzis BC: Among patients treated with FSH and GnRH analogues for in vitro fertilization, is the addition of recombinant LH associated with the probability of live birth? A systematic review and meta-analysis. Hum Reprod Update. 2007, 13 (5): 445-452. 10.1093/humupd/dmm008.

    Article  CAS  PubMed  Google Scholar 

  11. Kovacs P, Kovats T, Kaali SG: Results with early follicular phase recombinant luteinizing hormone supplementation during stimulation for in vitro fertilization. Fertil Steril. 2010, 93 (2): 475-479. 10.1016/j.fertnstert.2008.12.010.

    Article  CAS  PubMed  Google Scholar 

  12. Tesarik J, Mendoza C: Effects of exogenous LH administration during ovarian stimulation of pituitary down-regulated young oocyte donors on oocyte yield and developmental competence. Hum Reprod. 2002, 17: 3129-3137. 10.1093/humrep/17.12.3129.

    Article  CAS  PubMed  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Jessica B Spencer.

Additional information

Competing interests

JBS, ASB and DRS declare they have no competing interests. SDC serves on the Future Fertility Leaders Advisory Board Meeting for Merck & Co., Inc.

Authors' contributions

JBS developed study design, analyzed data, statistical methods, and drafted the manuscript. ABS analyzed data, performed statistical analysis and reviewed the manuscript. SDC assembled the raw database, provided critical review and expertise. DRS developed hypothesis, study design and reviewed manuscript. All authors read and approved the final manuscript.

Rights and permissions

This article is published under license to BioMed Central Ltd. This is an Open Access article 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 cited.

Reprints and Permissions

About this article

Cite this article

Spencer, J.B., Browne, A.S., Copland, S.D. et al. Discontinuation of rLH two days before hCG may increase the number of oocytes retrieved in IVF. Reprod Biol Endocrinol 8, 29 (2010).

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI:


  • Control Ovarian Hyperstimulation
  • Antral Follicle Count
  • Ovarian Hyperstimulation Syndrome
  • Reproductive Endocrinology
  • Oocyte Yield