UGT1A1 Gene Mutation Analysis (Quantitative Product Variant Detection)

What This Test Measures

The UGT1A1 gene encodes an enzyme involved in the metabolism of drugs and toxins, including some chemotherapy medications and bile acids. Variations in this gene can lead to altered enzyme activity, affecting how your body processes these substances. This test specifically detects quantitative differences in the UGT1A1 gene product (enzyme activity or variant presence) that may impact your health or treatment response.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have a history of severe side effects from medications metabolized by UGT1A1 enzymes, such as irinotecan (a chemotherapy drug), or if you have symptoms linked to genetic conditions like Gilbert’s syndrome or Crigler-Najjar syndrome. It can also be used for genetic counseling or preconception screening.

Sample Collection and Process

A blood sample is typically collected to analyze genetic material. The test involves examining the UGT1A1 gene sequence to identify specific mutations or quantitative changes in the gene product, often compared to a reference sample for comparison.

What the Results Mean

Results may indicate normal enzyme activity, reduced activity due to gene variants, or other quantitative differences. These findings can guide treatment decisions, especially for medications that rely on UGT1A1 for metabolism. Consult your healthcare provider to interpret results in the context of your overall health and medical history.