We also perform this testing if a Serum/Blood Pregnancy Test is requested.
GENERAL NOTES
APPLICATION: Qualitative test: diagnosis of pregnancy, including ectopic pregnancy. Quantitative test: diagnosis of threatened abortion or ectopic pregnancy (sequential tests may be needed). Monitoring hCG-producing tumours eg, hydatidiform mole, uterine choriocarcinoma, gonadal and extragonadal germ cell tumours. For tumour monitoring, an assay that detects the beta-subunit is required. Such assays are also suitable for pregnancy-related applications.
INTERPRETATION: The test becomes positive 6-10 days following ovulation, if pregnancy occurs. The normal doubling time for the hormone in early pregnancy is 36 hours; low levels for gestational age and/or a low rate of increase may indicate threatened abortion or ectopic pregnancy. High levels for gestational age may indicate molar pregnancy. Increased levels in a patient with a history of an hCG-producing tumour indicate residual or recurrent tumour.