Serologic test of alpha-fetoprotein 16.35 ng/mL is not high, and many clinical laboratories use 20 ng/mL as the upper limit of normal for alpha-fetoprotein, which is produced by the liver and embryo. When serologic tests for alpha-fetoprotein are greater than 400 ng/mL as a condition for diagnosis of hepatocellular carcinoma, which is a common cause of elevated alpha-fetoprotein in hepatocellular disease. In children, the presence of elevated alpha-fetoprotein on serologic examination can be suspected to be caused by hepatoblastoma or gonadal teratoblastoma. In adults, the presence of elevated alpha-fetoprotein on serology may be suspicious for ovarian tumors, testicular tumors, or malignant teratomas. If the serologic examination of alpha-fetoprotein is elevated, it is necessary to go to the hospital for detailed examination and treatment after a clear diagnosis.