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Albumin adjusted calcium: Study in a tertiary care hospital

Z A Mohd Ariffin1, F A Jamaluddin

  • 1University of Malaya, Faculty of Medicine, Department of Pathology, 50603 Kuala Lumpur Malaysia. zaki.anuar@ummc.edu.my.

The Malaysian Journal of Pathology
|December 28, 2020
PubMed

Insights

A new equation for albumin-adjusted calcium (total calcium + 0.014 x (39-albumin)) was derived, improving calcium level classification for 17% of patients, especially those with hypoalbuminemia.

Area of Science:

  • Clinical Chemistry
  • Laboratory Medicine
  • Biochemistry

Background:

  • The standard albumin-adjusted calcium equation may be inaccurate with current laboratory assays.
  • Existing equations were developed using older measurement methods for serum total calcium and albumin.

Purpose of the Study:

  • To derive and validate a new albumin-adjusted calcium equation specific to current laboratory methodologies.
  • To assess the impact of the new equation on calcium status classification in hypoalbuminemic patients.

Main Methods:

  • Linear regression analysis was used to associate serum total calcium and albumin levels in 3,175 adult patients.
  • The derived equation was validated on a separate patient cohort.
  • Calcium status reclassification was compared in 469 hypoalbuminemic patients using both equations.

Main Results:

  • A new equation was developed: total calcium + 0.014 x (39-albumin).
  • The new equation reclassified 78 out of 469 hypoalbuminemic patients (17%).
  • Specific reclassifications included 55 normocalcemic patients identified as hypocalcemic and 22 as normocalcemic instead of hypercalcemic.

Conclusions:

  • The newly derived albumin-adjusted calcium equation significantly impacts calcium status classification.
  • Laboratory-specific equations are recommended for accurate calcium measurement based on assay methodologies.
  • Accurate adjusted calcium levels are crucial for appropriate patient management.
Abstract

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