Endocrine Abstracts

Introduction: Free ionised calcium is the biologically active component of total circulating calcium but is infrequently measured due to sampling requirements. Therefore, total calcium is ‘adjusted’ for albumin to provide a closer estimate of the biologically active ionised calcium level (e.g. James, Orell, Payne and Berry formulae). Here, we aim to derive a novel equation to estimate ionised calcium from readily available biochemical parameters and compare its perfo...