Is CYP2D6 useful for Blutzucker?

CYP2D6 is a key enzyme for metabolizing many drugs, but there is no robust evidence that a CYP2D6 genetic test is useful for assessing blood sugar levels or diabetes risk. CYP2D6 variants primarily affect the metabolism of medications such as beta-blockers, antidepressants, and opioids – not glucose metabolism directly. Some of these drugs can indirectly influence blood sugar, but the effect is individual and not reliably predicted by CYP2D6 alone. The evidence for a direct link between CYP2D6 and blood sugar is mechanistic or speculative. For evaluating blood sugar or diabetes risk, established markers like fasting glucose, HbA1c, HOMA-IR, or polygenic risk scores for type 2 diabetes are appropriate. A CYP2D6 test does not provide clinically actionable information in this context. Be cautious of marketing claims that extrapolate a drug metabolism test to blood sugar management.