Biochemical Pregnancy
A pregnancy detected by hCG testing but not confirmed by ultrasound visualization of gestational sac.
Full Definition
Biochemical pregnancy refers to early pregnancy loss occurring before ultrasound detection of a gestational sac, typically before 5-6 weeks gestation. These pregnancies are detected through positive beta-hCG levels that subsequently decline without progression to clinical pregnancy. In ART cycles, biochemical pregnancies are relatively common, representing approximately 20-30% of positive pregnancy tests following embryo transfer. The condition suggests successful implantation but failure of continued embryonic development. While emotionally challenging for patients, biochemical pregnancies provide valuable information about embryo quality and endometrial receptivity. Documentation requires careful distinction from clinical pregnancies for accurate success rate reporting.
Usage
Usage note: Hyphenate when used as adjective; acceptable as two words when used as noun.
In Context
- "The positive beta-hCG test result was followed by declining levels, indicating biochemical pregnancy." — Laboratory results interpretation
- "Biochemical pregnancy rates help assess embryo quality and treatment protocol effectiveness." — Clinic outcome analysis