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Table 5 The USA hCG Reference Service experience, 1997 – 2008 with 319 cases with persistent low positive hCG in the absence of pregnancy or history of gestational trophoblastic disease or other malignancy.

From: New discoveries on the biology and detection of human chorionic gonadotropin

Source of hCG Menopause Ages > 50 Perimenopause Ages > 40 Menstrual Ages 18 – 40
Pituitary hCG 43 60 9
Non-trophoblastic neoplasm 0 2 9
Gestational trophoblastic neoplasm 0 2 10
False positive hCG test 1 8 82