Homozygous UGT1A1*28 Positive

**Semantic type:** Laboratory or Test Result

**Definition:** An indication that homozygous expression of the UGT1A1*28 allele has been detected in a sample. This genotype is associated with extremely reduced levels of metabolic activity against bilirubin and various pharmacologic agents compared to the wild-type.

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