The **Alpha-Fetoprotein (AFP) Diagnostic Test** is a crucial blood screening tool primarily used to measure the levels of AFP, a protein produced mainly by the fetal liver and yolk sac. In pregnant individuals, elevated or abnormally low maternal serum AFP levels can indicate potential fetal neural tube defects, like spina bifida, or chromosomal abnormalities.

For adults, the AFP test serves as an essential tumor marker. Significantly elevated levels are strongly associated with liver cancer (hepatocellular carcinoma) and certain germ cell tumors of the ovaries or testes, aiding clinicians in cancer diagnosis, staging, and monitoring treatment efficacy.