{"id":"igg","name":"Immunoglobulin G (IgG)","shortName":"IgG","aliases":["Immunoglobulin G","IgG","IgG, Quantitative","IgG Serum","IgG, Total","Immunoglobulin G, Qn, Serum","Total IgG","Inmunoglobulina G","Immunglobulin G","Immunoglobulin G (IgG), Serum","IgG, Serum","IgG Quant","Serum IgG","Immunoglobulin G, Quantitative","Quantitative IgG"],"abbreviations":["IgG"],"loinc":[{"code":"2465-3","primary":true}],"specimen":"serum-or-plasma","units":[{"ucum":"mg/dL","display":"mg/dL"},{"ucum":"g/L","display":"g/L"},{"ucum":"mg/L","display":"mg/L"}],"referenceRanges":[{"population":"Men, 20+","low":603,"high":1613,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Labcorp interval for males over 19 (test 001776), from its pediatric reference ranges document. Labcorp prints 586–1,602 mg/dL for females. Mayo (767–1,590), ARUP (768–1,632) and ABIM (800–1,500) print one interval for all adults, so the lower limit differs by about 200 mg/dL between labs. Use the interval printed on your own report first.","sources":[{"title":"Pediatric Testing Reference Ranges (includes adult intervals for Labcorp tests 001776, 001784, 001792 and 001834)","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp Diagnostics"}]},{"population":"Women, 20+","low":586,"high":1602,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Labcorp interval for females over 19 (test 001776).","sources":[{"title":"Pediatric Testing Reference Ranges (includes adult intervals for Labcorp tests 001776, 001784, 001792 and 001834)","url":"https://www.labcorp.com/content/dam/labcorp/drupal/178250_DX_TL_PediatricTestRef_Final.pdf","publisher":"Labcorp Diagnostics"}]},{"population":"18+","low":767,"high":1590,"unit":"mg/dL","unitDisplay":"mg/dL","note":"Mayo Clinic Laboratories interval for all adults 18 and older (nephelometry), with no sex split. ARUP prints 768–1,632 mg/dL for ages 19 and up (immunoturbidimetry), and ABIM lists 800–1,500 mg/dL. Labs differ, so use the interval on your own report first.","sources":[{"title":"Immunoglobulin G (IgG), Serum (test ID IGG)","url":"https://www.mayocliniclabs.com/test-catalog/overview/8160","publisher":"Mayo Clinic Laboratories"},{"title":"Immunoglobulins (IgA, IgG, IgM), Quantitative (test 0050630)","url":"https://ltd.aruplab.com/Tests/Pub/0050630","publisher":"ARUP Laboratories"},{"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 most common antibody in your blood. It shows how much of this main infection-fighting protein your body makes.","url":"https://bloodtesttracker.com/markers/igg","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}