If a blood test is drawn for methemoglobin 12.7ug/L, it is normal. The normal value of alpha-fetoprotein in blood is less than 25ug/L. 12.7ug/L is in the normal range. AFP is a protein synthesized by the liver and yolk sac when a person is still in the mother’s body during fetal life, and this protein enters the mother’s bloodstream through the umbilical cord, resulting in elevated AFP in pregnant women. This protein enters the mother’s bloodstream through the umbilical cord, resulting in elevated fetoprotein in the mother. After birth, fetoprotein synthesis is soon suppressed, resulting in a rapid decrease in the amount of fetoprotein in the blood. When a person suffers from liver cancer or testicular cancer, ovarian cancer, teratoma and other tumors, the ability to synthesize fetoprotein will be restored and the level of fetoprotein in the body will be significantly increased. In addition, when stomach cancer, pancreatic cancer, viral hepatitis, or cirrhosis of the liver, AFP will also increase.