{"id":"ca-27-29","name":"CA 27.29","shortName":"CA 27.29","aliases":["CA27.29","Cancer Antigen 27.29","BR 27.29","CA 27-29","CA 27.29 Antigen","Truquant BR","BR27.29","BR 27-29","Breast Carcinoma-Associated Antigen","Breast Carcinoma Assoc Ag(CA 27.29)","Carbohydrate Antigen 27.29","Cancer Associated Breast Antigen","CABA","Breast Carcinoma Associated Mucin Antigen","Cancer Ag 27-29"],"abbreviations":["CA 27.29","CA27.29","BR 27.29"],"loinc":[{"code":"17842-6","primary":true}],"specimen":"serum","units":[{"ucum":"U/mL","display":"U/mL"},{"ucum":"kU/L","display":"kU/L"}],"referenceRanges":[{"population":"Adults","low":0,"high":38.6,"unit":"U/mL","unitDisplay":"U/mL","note":"Labcorp prints 0 to 38.6 U/mL. Mayo Clinic Laboratories prints 38.0 U/mL or lower for adults 18 and older (for men Mayo says use is not defined). Use the range printed on the lab report.","sources":[{"title":"Cancer Antigen (CA) 27.29 (test 140293)","url":"https://www.labcorp.com/tests/140293/cancer-antigen-ca-27-29","publisher":"Labcorp"},{"title":"C2729 - Breast Carcinoma-Associated Antigen, Serum","url":"https://www.testcatalog.org/show/C2729","publisher":"Mayo Clinic Laboratories (Extended Catalog)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A protein from the same family as CA 15-3. Doctors use it to follow breast cancer treatment and recurrence, and harmless conditions can raise it too.","url":"https://bloodtesttracker.com/markers/ca-27-29","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}