{"id":"psa-free-percent","name":"PSA, Free Percent (% Free PSA)","shortName":"% Free PSA","aliases":["% Free PSA","PSA, % Free","Free PSA %","PSA Free/Total Ratio","Percent Free PSA","Free/Total PSA","%fPSA","Free PSA ratio","f/t PSA","Relación PSA libre/total","Free PSA Percent","PSA, Percent Free","PSA Free Percentage","Free PSA/PSA Ratio","Free/Total PSA Ratio","Percent Free PSA, Serum"],"abbreviations":["%fPSA","%FPSA","f/t PSA"],"loinc":[{"code":"12841-3","primary":true},{"code":"72576-2","primary":false}],"specimen":"calculated","units":[{"ucum":"%","display":"%"},{"ucum":"1","display":"ratio (0–1)"}],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The share of your PSA that is not attached to other proteins. With a mildly raised total PSA, a lower share goes with a higher chance a biopsy finds cancer.","url":"https://bloodtesttracker.com/markers/psa-free-percent","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}