{"id":"apob-apoa1-ratio","name":"ApoB / ApoA1 Ratio","shortName":"ApoB/ApoA1","aliases":["ApoB:ApoA-I","Apolipoprotein B/A1 Ratio","Apo B/Apo A1 Ratio","Apo B/Apo A1","ApoB:ApoA1","ApoB/ApoA-I ratio","Relación ApoB/ApoA1","Apolipoprotein B/A Ratio","Apolipoprotein B/A1 ratio","Apo B/A Ratio","ApoB/ApoA1","Apolipoprotein B to Apolipoprotein A1 Ratio","Apolipoprotein B/A-I Ratio"],"abbreviations":["ApoB/ApoA1","ApoB/ApoA-I","ApoB:ApoA1"],"loinc":[{"code":"1874-7","primary":true}],"specimen":"calculated","units":[{"ucum":"{ratio}","display":"ratio"}],"referenceRanges":[{"population":"Men","low":null,"high":0.9,"unit":"{ratio}","unitDisplay":"ratio","note":"Mayo Clinic Laboratories labels men 18 and older as lower risk under 0.7, average risk 0.7 to 0.9 and higher risk above 0.9; ARUP's high-risk category also starts above 0.90. The upper limit here is the top of the average-risk band. These are risk categories printed by the labs, not the central 95% of healthy people. Pediatric cutoffs are not encoded.","sources":[{"title":"Apolipoprotein A1 and B, Serum (test APOAB), including the Apolipoprotein B/A1 ratio","url":"https://www.testcatalog.org/show/APOAB","publisher":"Mayo Clinic Laboratories (Extended Catalog)"},{"title":"Apolipoprotein B/A Ratio (test 0050028)","url":"https://ltd.aruplab.com/Tests/Pub/0050028","publisher":"ARUP Laboratories"}]},{"population":"Women","low":null,"high":0.8,"unit":"{ratio}","unitDisplay":"ratio","note":"Mayo Clinic Laboratories labels women 18 and older as lower risk under 0.6, average risk 0.6 to 0.8 and higher risk above 0.8. ARUP uses one scale for everyone, with high risk starting above 0.90, so a woman between 0.8 and 0.9 can be higher risk at Mayo and medium risk at ARUP.","sources":[{"title":"Apolipoprotein A1 and B, Serum (test APOAB), including the Apolipoprotein B/A1 ratio","url":"https://www.testcatalog.org/show/APOAB","publisher":"Mayo Clinic Laboratories (Extended Catalog)"},{"title":"Apolipoprotein B/A Ratio (test 0050028)","url":"https://ltd.aruplab.com/Tests/Pub/0050028","publisher":"ARUP Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Compares ApoB (the protein on particles that can build up in arteries) with ApoA1 (the main HDL protein). A higher ratio is linked to more heart attacks.","url":"https://bloodtesttracker.com/markers/apob-apoa1-ratio","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}