“…At present, most seated reference range data has been published by labs in western countries. In China and even in East Asia, only individual single-centre seated 16 or supine reference intervals have been reported, 21,22 and some studies just used HPLC or LC-ECD methods, and no large-sample or multi-centre seated plasma reference has been established. Therefore, the reference intervals established in this study have certain reference values, especially in non-western countries.…”