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Characterizing urinary hCGβcf patterns during pregnancy
Robert D Nerenz1, Melanie L Yarbrough2, Ulf-Håkan Stenman3
1Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, United States; Department of Pathology and Laboratory Medicine, University of Kentucky Medical Center, Lexington, KY, United States.
Clinical Biochemistry
|April 19, 2016
Summary
Urinary hCG beta core fragment (hCGβcf) is the main pregnancy marker in urine, but its unpredictable levels can cause false-negative pregnancy tests. Understanding hCGβcf patterns is crucial for accurate pregnancy test interpretation.
Area of Science:
- Reproductive Endocrinology
- Clinical Chemistry
- Biochemistry
Background:
- Elevated human chorionic gonadotropin beta core fragment (hCGβcf) can lead to false-negative results with qualitative urine pregnancy tests.
- The urinary excretion pattern of hCGβcf throughout normal pregnancy is not well-characterized.
Purpose of the Study:
- To evaluate the relationship between urinary intact hCG, hCGβcf, and hCG free beta subunit (hCGβ) during pregnancy.
- To characterize the pattern of urinary hCGβcf excretion in pregnant women.
Main Methods:
- Screened 100 second-trimester urine specimens for high hCGβcf concentrations using a point-of-care device.
- Quantified intact hCG, hCGβcf, hCGβ, and specific gravity in first, second, and third-trimester specimens from 25 women.
Main Results:
- Urinary hCGβcf concentrations consistently exceeded intact hCG concentrations.
- A strong correlation (r²=0.70) was found between intact hCG and hCGβcf.
- Highest hCGβcf levels occurred between 10-16 weeks gestation, with significant inter-individual variability.
Conclusions:
- Urinary hCGβcf is the predominant immunoreactive component during pregnancy.
- Excretion patterns of hCGβcf are unpredictable, necessitating careful interpretation of qualitative pregnancy tests.
- Manufacturers and clinicians must consider hCGβcf levels when designing and interpreting urine hCG tests.
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