UGT1A1*28/*37 Positive

**Semantic type:** Laboratory or Test Result

**Definition:** An indication that simultaneous expression of the *28 and *37 alleles of the UGT1A1 gene have been detected in a sample. This genotype is associated with decreased levels of metabolic activity against bilirubin and various pharmacologic agents, which is associated with increased risk for drug toxicity.

**Synonyms:** - UDP Glucuronosyltransferase Family 1 Member A1*28/*37 - UDP Glucuronosyltransferase Family 1 Member A1*28/*37 Positive - UGT1A1 *28/*37 - UGT1A1*28/*37 - UGT1A1*28/*37 Genotype Positive