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Effect of low urine specific gravity on pregnancy testing
1University of Southern California School of Medicine, USA.
Journal of American College Health : J of ACH
|November 27, 1998
Summary
Low urine specific gravity does not affect sensitive urine pregnancy tests. Studies show that even with diluted urine, immunoassay tests for human chorionic gonadotropin (HCG) remain accurate.
Area of Science:
- Clinical Chemistry
- Diagnostic Testing
- Reproductive Health
Background:
- Urine specific gravity indicates urine concentration.
- Dilute urine may potentially affect the sensitivity of diagnostic tests.
- Accurate early pregnancy detection is crucial for timely healthcare decisions.
Purpose of the Study:
- To investigate if low urine specific gravity impacts the accuracy of urine pregnancy tests.
- To compare urine pregnancy test results with serum pregnancy tests in cases of dilute urine.
Main Methods:
- Evaluation of 410 urine specimens from a university student health center.
- Measurement of urine specific gravity for all specimens.
- Concomitant serum pregnancy testing for samples with negative urine tests and specific gravity < 1.015.
Main Results:
- Eighty women with urine specific gravity < 1.015 had negative urine pregnancy tests.
- These results were confirmed by concomitant serum pregnancy tests.
- No false negative results were observed due to low specific gravity.
Conclusions:
- Current highly sensitive immunoassays for human chorionic gonadotropin (HCG) are reliable.
- Low urine specific gravity does not appear to compromise the sensitivity or accuracy of these pregnancy tests.