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Updated: Sep 28, 2025

Low-Cost, Volume-Controlled Dipstick Urinalysis for Home-Testing

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False Negative Urine Pregnancy Test: Hook Effect Revealed.

Shista Priyadarshini¹, Fnu Manas¹, Sheela Prabhu¹

¹Internal Medicine, Guthrie Robert Packer Hospital, Sayre, USA.

|April 4, 2022

Summary

Urine pregnancy tests can rarely give false negatives due to the hook effect, potentially leading to unintended medical exposures. Understanding this antigen-antibody imbalance is crucial for accurate pregnancy detection.

Keywords:

false negative poc upt false negative test in late pregnancy false negative upt false negative urine pregnancy test hook effect

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Area of Science:

Reproductive health
Clinical diagnostics
Biochemistry

Background:

Urine pregnancy test kits are widely used for detecting pregnancy in women of childbearing age.
Accurate early pregnancy detection is vital for timely prenatal care and management.

Observation:

Pregnancy test kits can occasionally fail to detect pregnancy, resulting in false-negative results.
This failure can rarely lead to inadvertent exposure to laboratory procedures and radiation.

Findings:

The hook effect is an uncommon but significant phenomenon that causes false-negative pregnancy test results.
This occurs due to an abnormal antigen-antibody ratio within the test kit.

Implications:

False-negative results from pregnancy tests can delay crucial medical interventions.
Awareness of the hook effect is necessary for healthcare providers to ensure accurate diagnosis and patient safety.