Clinical Report: Adjusted Calcium Is Lying — And Labs Keep Printing It

Overview

This editorial highlights the limitations of albumin-adjusted calcium, particularly in elderly, critically ill, and renally impaired patients. The authors advocate for the use of ionized calcium as a more reliable alternative to prevent misdiagnosis of calcium disorders.

Background

Albumin-adjusted calcium has been a standard practice for decades, yet its reliability is increasingly questioned. Misclassification of calcium status can lead to inappropriate clinical decisions, especially in vulnerable populations. The shift towards measuring ionized calcium reflects a growing recognition of the limitations of correction formulas.

Data Highlights

No numerical data provided in the source material.

Key Findings

• Albumin-adjusted calcium is unreliable in elderly, critically ill, and renally impaired patients.
• The concept of corrected calcium has been challenged since the 1970s.
• Universal reporting of albumin-adjusted calcium can lead to misdiagnosis of hypo- or hypercalcaemia.
• Ionized calcium is recommended as the preferred alternative for accurate calcium assessment.
• Recent studies show that unadjusted total calcium has better agreement with ionized calcium than correction formulas.

Clinical Implications

Clinicians should be cautious about relying on albumin-adjusted calcium due to its limitations in certain patient populations. Direct measurement of ionized calcium is recommended for more accurate diagnosis and management of calcium disorders.

Conclusion

The editorial underscores the need to move away from albumin-adjusted calcium in clinical practice, advocating for ionized calcium as a more reliable measure. This shift is essential for improving patient care and diagnostic accuracy.

Related Resources & Content

1. Chiang and Choy, Pathology, 2023 -- Adjusted Calcium Is Lying — And Labs Keep Printing It
2. Critical Care (Springer) — Utilizing Albumin-Corrected Calcium Ratios to Enhance Detection of Citrate Accumulation and Improve Mortality Forecasting in Continuous Kidney Replacement Therapy
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4. The Journal of Clinical Endocrinology & Metabolism — Association of Elevated Ionized Calcium Levels with Primary Hyperparathyroidism Risk in the General Population
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8. Use of Albumin-Adjusted Calcium Measurements in Clinical Practice | Diabetes and Endocrinology | JAMA Network Open | JAMA Network
9. Albumin-corrected calcium ratios for citrate accumulation increase detection and improve mortality prediction in continuous kidney replacement therapy | Critical Care | Springer Nature Link