Dihydrothymine Unit Converter

Dihydrothymine is a metabolite produced during the normal breakdown of thymine, one of the four bases that make up DNA. It is formed when the enzyme dihydropyrimidine dehydrogenase (DPD) reduces thymine in the first step of pyrimidine catabolism.

Measuring dihydrothymine in the blood helps assess how well the body's pyrimidine degradation pathway is functioning. It is typically ordered as part of a broader purines and pyrimidines panel alongside related metabolites such as thymine, uracil, and dihydrouracil.

Abnormal levels can indicate rare inherited enzyme deficiencies that affect pyrimidine metabolism, some of which have important implications for the safe use of certain chemotherapy drugs.

Dihydrothymine is produced primarily in the liver when dihydropyrimidine dehydrogenase (DPD) reduces thymine as the first step of pyrimidine catabolism. Smaller amounts are produced in other tissues where pyrimidine turnover occurs.