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THDPthiamin diphosphate
THDPTracking Human Development Program
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[3] Nonstandard abbreviations: EQA, external quality assessment; TDP, thiamin diphosphate; PLP, pyridoxal 5-phosphate; Hb, hemoglobin; [CV.sub.I], intraindividual biological CV; [SD.sub.A.sup.2], analytical variance; [CV.sub.A], analytical CV; [SD.sub.TI.sup.2], total intraindividual variance; [CV.sub.TI], total intraindividual CV; [SD.sub.G.sup.2] interindividual variance; [SD.sub.T.sup.2], total variance; [CV.sub.T], total CV; [CV.sub.G], interindividual biological CV; II, index of individuality; and R[CV.sub.I] reference change value.
In his experience, the indirect measurement of thiamin status using the transketolase (ETK) activation assay is clinically more useful than direct measurement of thiamin diphosphate (TDP) concentrations in red cells in people repleted with thiamin.
The free form of thiamin occurs mainly in plasma, whereas the coenzyme thiamin diphosphate (TDP) [1] predominates intracellularly.