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  • Title: Pitfall in the diagnosis of ectopic pregnancy: immunocytochemical evaluation in a patient with false-negative serum beta-hCG levels.
    Author: Taylor RN, Padula C, Goldsmith PC.
    Journal: Obstet Gynecol; 1988 Jun; 71(6 Pt 2):1035-8. PubMed ID: 2453820.
    Abstract:
    Tubal pregnancy specimens from a patient with undetectable serum beta-hCG levels and a control case with a low beta-hCG titer by radioimmunoassay were analyzed using peroxidase-antiperoxidase immunocytochemical localization of placental proteins. The results indicated that deficient production of beta-hCG by ectopic trophoblast was responsible for false-negative pregnancy tests in one patient.
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