You also review susan's lab work, recalling that pregnancy tests on urine or blood are determined to be positive based on the presence of a particular hormone. this biologic marker of pregnancy is human chorionic gonadotropin.
- Human chorionic gonadotropin (HCG), which is produced by the trophoblast cells of the placenta shortly after a fertilized ovum implants, is a biologic indicator of pregnancy.
- It can be detected in the mother's urine and serum as early as six days after conception, depending on the test used.
- The highest level is reached in 50 to 70 days. Susan's blood HCG levels are believed to be a reliable indicator of pregnancy.
- Positive pregnancy tests may also come about if the patient has particular tumors that release HCG.
- Progesterone must increase for a pregnancy to remain viable even though it is not a biological indicator of pregnancy.
Learn more about human chorionic gonadotropin
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