biochemical pregnancy
Pregnancy detected only by hormone levels without ultrasound visualization, typically ending in early miscarriage.
Full Definition
A biochemical pregnancy is a very early pregnancy loss that occurs after implantation but before the pregnancy can be detected by ultrasound, typically around 5-6 weeks of gestation. It is characterized by an initial positive pregnancy test due to rising hCG levels, followed by declining levels and menstruation. Also known as a chemical pregnancy, this condition accounts for 50-75% of all miscarriages and is often unrecognized in natural conception cycles. In assisted reproductive technology, biochemical pregnancies are more readily detected due to routine hCG monitoring. While disappointing for patients, these pregnancies indicate that implantation occurred, which can be encouraging for future treatment cycles.
Usage
Usage note: Distinguish from clinical pregnancy and emphasize its significance in ART monitoring.
In Context
- "The patient experienced a biochemical pregnancy with hCG levels that peaked at 45 mIU/mL." — Clinical outcome report
- "Biochemical pregnancy rates were 12% higher than clinical pregnancy rates in this cycle." — Laboratory statistics