{"id":"gamma-globulin","name":"Gamma Globulin, SPEP (g/dL)","shortName":"Gamma Globulin","aliases":["Gamma","Gamma Globulin","Gamma Globulins","Gamma Globulin, SPEP","Gamma Globulin g/dL","SPEP Gamma","Gamma Glob","Gamma Globulin (SPEP)","Gamma Globulin Fraction","Gamma Globulin, Serum","Gamma Fraction"],"abbreviations":[],"loinc":[{"code":"2874-6","primary":true}],"specimen":"serum","units":[{"ucum":"g/dL","display":"g/dL"},{"ucum":"g/L","display":"g/L"}],"referenceRanges":[{"population":"18+","low":0.4,"high":1.8,"unit":"g/dL","unitDisplay":"g/dL","note":"Labcorp interval for ages over 17 (test 001487, result 001492), with no sex split. Other sources are narrower at the low end: ARUP prints 0.62–1.51 g/dL (quantitative capillary electrophoresis), ABIM lists 0.7–1.7 and MedlinePlus lists 0.8–1.8 as an example. Labs using gel methods or other capillary systems print different limits, so use the interval on your own report first.","sources":[{"title":"Pediatric Testing Reference Ranges (includes adult intervals for Labcorp tests 001487, 001776, 001784, 001792 and 001834)","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp Diagnostics"},{"title":"Protein Electrophoresis, Serum (test 0050640)","url":"https://ltd.aruplab.com/Tests/Pub/0050640","publisher":"ARUP Laboratories"},{"title":"Protein electrophoresis - serum","url":"https://medlineplus.gov/ency/article/003540.htm","publisher":"MedlinePlus (National Library of Medicine)","year":2026},{"title":"ABIM Laboratory Test Reference Ranges, January 2026","url":"https://www.abim.org/Media/bfijryql/laboratory-reference-ranges.pdf","publisher":"American Board of Internal Medicine","year":2026}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The amount of protein in the gamma zone on serum electrophoresis, mostly antibodies. Reported in g/dL.","url":"https://bloodtesttracker.com/markers/gamma-globulin","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}