UGT1A1*1/*28 Positive

**Semantic type:** Laboratory or Test Result

**Definition:** An indication that simultaneous expression of the *1 and *28 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.

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