Measurement uncertainty for the analysis of serum 25-hydroxyvitamin D: response to Stepman and Thienpont

Abstract

We thank Drs Stepman and Thienpont for their comment on our recent article in which we reported what we called "a relatively high measurement uncertainty for the measurement of serum 25(OH)D levels" (1). Indeed, we found that if one wants to be sure that the 25(OH)D serum concentration of a given patient is >80 nmol/L, a value >100 nmol/L should be