Skip to main content
  • Home
  • Articles
    • Archive from 2022 July
    • Archive 1960 to 2022 June
    • Accepted Articles
    • Published Ahead-of-Print
    • Supplement
  • About
  • For Authors
  • Podcasts

Molar pregnancy with false negative urine hCG: the hook effect

< Back to Listing

Share this Article

Singapore Med J 2010; 51(3): e58-e61
Molar pregnancy with false negative urine hCG: the hook effect

  • Abstract
  • PDF

Pang YP, Rajesh H, Tan LK
Correspondence: Dr Cindy Pang, cindypangyp@yahoo.com

ABSTRACT
Urine pregnancy tests are widely used in emergency departments as the first screening test for patients of reproductive age presenting with gynaecological problems in order to rule out pregnancy. Conditions, such as complete molar pregnancy, which produces large amounts of beta human chorionic gonadotropin (ß-hCG), may cause a false negative result due to an oversaturation of the assay system, known as the “hook effect”. We report a case where the exclusion of pregnancy by urine testing led to the initial misdiagnosis of a molar pregnancy as a degenerative fibroid. Physicians need to be reminded of the possibility of false negative results with this commonly used test. Negative or inconclusive results in patients with a high suspicion of pregnancy should be further evaluated by serum quantification of ß-hCG and appropriate sample dilution.

Keywords: beta-human chorionic gonadotropin, false negative, hook effect, hydatidiform mole, urine pregnancy test
Singapore Med J 2010; 51(3): e58-e61

http://smj.org.sg/sites/default/files/5103/5103cr4.pdf
×

Around the Site

Home

About SMJ

For Reviewers

Sign Up for Alerts

Issues

Current Issue

All Issues

Online First

Supplement

CME

For Authors

Instructions for Authors

Submit Manuscript


Follow us on:
        

More Links

Contact Us

Copyright

Advertise

SMJ Forms

Privacy Policy

SMA Home

Copyright 2021. Singapore Medical Association. All Rights Reserved.