{"id":"hla-b27","name":"HLA-B27","shortName":"HLA-B27","aliases":["HLA-B27 Antigen","HLA-B27 Typing","HLA-B*27","B27","HLA B27","HLA-B27 Antigen, Blood","HLA-B27 PCR","HLA-B27 by Flow Cytometry","HLA B27 Typing","HLA-B27 DNA","B27 Antigen","HLA B*27 Typing","HLA-B27 Genotyping"],"abbreviations":["HLA-B27","B27"],"loinc":[{"code":"4821-5","primary":true},{"code":"26028-1","primary":false},{"code":"26043-0","primary":false}],"specimen":"whole-blood","units":[],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A one-time test for HLA-B27, a protein on white blood cells. Many people who have it stay healthy, but it is more common in some kinds of inflammatory arthritis and eye inflammation.","url":"https://bloodtesttracker.com/markers/hla-b27","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}