Calculator

Albumin-corrected calcium

New

Ca (mg/dL) + 0.8 × (4.0 − albumin g/dL). Prefer ionised calcium in ICU.

mg/dL
g/dL

Corrected calcium

8.8 mg/dL

Normal (≈ 8.5-10.5)

Low
Normal (≈ 8.5-10.5)
High

Formula

ca + 0.8 * (4 - alb)

References

  1. Payne RB, et al. Interpretation of serum calcium in patients with abnormal serum proteins. Br Med J 1973;4:643-6.

Used in

Calcium, magnesium, phosphate and refeeding syndromeHeparin vs citrate anticoagulation

Calculators support, not replace, clinical judgement. Check inputs and units, and confirm doses with your unit protocol.