{"id":"afp","name":"AFP (Alpha-Fetoprotein)","shortName":"AFP","aliases":["Alpha-Fetoprotein","AFP","AFP, Tumor Marker","Alpha-1-Fetoprotein","AFP, Serum","Alfa-fetoproteína","AFP tumour marker","Alpha-Fetoprotein (Tumor Marker)","AFP, Serum, Tumor Marker","α-Fetoprotein (AFP), Tumor Marker","Alpha-Fetoprotein, Tumor Marker, S","Alpha Fetoprotein, Tumor Marker (AFP), Serum","Alpha-Fetoprotein Tumor Marker","Tumor Marker, Alpha Fetoprotein, Serum","Fetoprotein, Alpha","AFP Tumor Marker","Total AFP"],"abbreviations":["AFP"],"loinc":[{"code":"53962-7","primary":true},{"code":"1834-1","primary":false},{"code":"83073-7","primary":false}],"specimen":"serum","units":[{"ucum":"ng/mL","display":"ng/mL"},{"ucum":"ug/L","display":"µg/L"},{"ucum":"[IU]/mL","display":"IU/mL"},{"ucum":"k[IU]/L","display":"kIU/L"}],"referenceRanges":[{"population":"18+","low":0,"high":8.4,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Mayo Clinic Laboratories' single upper limit for people who are not pregnant (Beckman Access immunoassay). We apply it to adults only, because Mayo gives no range for newborns and Labcorp's limits for children differ. Pregnancy raises AFP, so this range does not apply in pregnancy. Labcorp's age- and sex-specific adult limits below range from 4.7 to 9.2 ng/mL. Use the most specific row that fits the person, and the range printed on the lab report.","sources":[{"title":"AFP - Overview: Alpha-Fetoprotein (AFP) Tumor Marker, Serum","url":"https://www.mayocliniclabs.com/test-catalog/overview/8162","publisher":"Mayo Clinic Laboratories"}]},{"population":"Men, 18–30","low":0,"high":5.7,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Labcorp adult limits come from its own in-house study on a Roche Elecsys immunoassay, and they differ a little by age and sex. Labcorp says its values apply only to men and to women who are not pregnant.","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Women, 18–30","low":0,"high":4.7,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Labcorp in-house limit; not valid in pregnancy.","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Men, 31–50","low":0,"high":6.9,"unit":"ng/mL","unitDisplay":"ng/mL","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Women, 31–50","low":0,"high":6.4,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Labcorp in-house limit; not valid in pregnancy.","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Men, 51–80","low":0,"high":8.4,"unit":"ng/mL","unitDisplay":"ng/mL","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Women, 51–80","low":0,"high":9.2,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Labcorp in-house limit; not valid in pregnancy.","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Men, 81+","low":0,"high":6.4,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Labcorp lists this row as over 80 years.","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]},{"population":"Women, 81+","low":0,"high":8.7,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Labcorp lists this row as over 80 years. Not valid in pregnancy.","sources":[{"title":"AFP, Serum, Tumor Marker (test 002253)","url":"https://www.labcorp.com/tests/002253/a-fetoprotein-afp-tumor-marker","publisher":"Labcorp"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A protein made by a baby's liver before birth. Adults who aren't pregnant normally have very little. Doctors follow it in some liver and germ cell conditions.","url":"https://bloodtesttracker.com/markers/afp","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}