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Test Code: hCG Preferred Name Human chorionic gonadotrophin

Yes
1 hour
All hours
4 hours
Medicare Item
N/A

Test Tubes

ImageSpecimen TypeSpecimen VolumeTube Type
Blood (adult)3 mLPST 4.5 mL Li Heparin Gel (Lt Green top)
Blood (paediatric)500 uLPST 500 uL Li Heparin Gel
Blood (neonatal)500 uLPST 500 uL Li Heparin Gel

COLLECTION NOTES

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.


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