Biochemistry The laboratory diagnosis of thiamine deficiency is by: A Transaldolase assay measured before and after the addition of thiamine pyrophosphate B Transketolase assay measured before and after the addition of thiamine pyrophosphate C Thiamine pyrophosphate assay in RBC after adding sugar D Serum LDH levels 💡 Explanation The laboratory diagnosis of thiamine deficiency is by: ✓ Correct Answer: B. Transketolase assay measured before and after the addition of thiamine pyrophosphate