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Related Experiment Videos

Negative βhCG and Molar Pregnancy: The Hook Effect.

Isabel Lobo Antunes1, Joana Curado1, Ana Quintas1

  • 1Gynaecology and Obstetrics Department. Hospital Garcia de Orta. Almada. Portugal.

Acta Medica Portuguesa
|October 14, 2017
PubMed
Summary

Molar pregnancy, a type of gestational trophoblastic disease, can metastasize despite being benign. A negative urine test can occur due to the

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Area of Science:

  • Gynecology and Obstetrics
  • Reproductive Endocrinology
  • Oncology

Background:

  • Molar pregnancy, a form of gestational trophoblastic disease, is a benign condition with metastatic potential.
  • Typically presents with extremely high beta-human chorionic gonadotropin (βhCG) levels in women of reproductive age.
  • Common symptoms include amenorrhea, vaginal bleeding, and signs of hyperthyroidism or hyperemesis due to elevated βhCG.

Observation:

  • Standard qualitative urine pregnancy tests can yield false-negative results due to the ' hook effect' at very high βhCG concentrations.
  • This case involved a molar pregnancy initially misdiagnosed as a degenerating fibroid, presenting with a negative urine pregnancy test.
  • Transvaginal ultrasound revealed findings highly suggestive of molar pregnancy.

Findings:

Keywords:
Chorionic Gonadotropin, beta Subunit, HumanHydatidiform mole

Related Experiment Videos

  • Quantitative βhCG testing confirmed the diagnosis of molar pregnancy.
  • The ' hook effect' can mask molar pregnancy in qualitative tests despite significantly elevated βhCG levels.
  • Early diagnosis was facilitated by high-resolution imaging and quantitative βhCG assays.

Implications:

  • A high index of suspicion is crucial for diagnosing molar pregnancy, especially when initial tests are misleading.
  • Timely diagnosis and treatment are essential to prevent potential complications and devastating consequences of delayed management.
  • This case underscores the importance of considering molar pregnancy in differential diagnoses, even with atypical presentations and negative initial screening.