What goes into the Corrected calcium
- Total calcium (mg/dL)
- Albumin (g/dL)
How to interpret the result
- Corrected Ca = measured Ca + 0.8 × (4.0 − albumin)
- Normal about 8.5–10.5 mg/dL; 10.5–12 mild, 12–14 moderate, > 14 severe hypercalcemia
Clinical pearls
- The correction is unreliable in CKD, critical illness and acid-base disturbance; measure ionized calcium in those patients.
- Symptoms and the rate of rise matter as much as the number.
Evidence
- Payne RB, et al. Interpretation of serum calcium in patients with abnormal serum proteins. Br Med J. 1973;4:643-646.
Related workups
Related calculators
For education only. Check the inputs and the population the score was validated in before acting on it. Not a substitute for clinical judgment.