If you picked a test with a low sensitivity and your period is only a few days late, you may not be producing enough human chorionic gonadotropin (hCG) to trigger a positive result.
AFP is often part of a triple-check blood test that analyzes three substances as risk indicators of possible birth defects: AFP, estriol, and human chorionic gonadotropin (HCG).
It's called a triple screen because it looks for three substances in the blood: alpha-feto protein (AFP), human chorionic gonadotropin (HCG), and unconjugated estriol.
It is up to 99 percent accurate from the first day of your missed period, provided you have detectable amounts of human chorionic gonadotropin (hCG) in your urine.
After conception, the pregnancy hormone hCG (Human Chorionic Gonadotropin) secretes from the developing placenta after the egg implants in the uterine lining.
First Response has created a test that can detect lower levels of the hormone hCG (human chorionic gonadotropin), also known as the pregnancy hormone.
Experts in the field tested ovulation stimulation over the next ten years using drugs such as clomiphene and human menopausal gonadotropin.
HCG, also known as human chorionic gonadotropin, is a hormone secreted by a developing placenta shortly after fertilization has occurred.
Blood tests may be run to check for a normal level of human chorionic gonadotropin (hCG), a pregnancy hormone that rises with pregnancy.
Presence of undescended testes is differentiated from absence of testicles by measuring the amount of gonadotropin hormone in the blood.