Why correct calcium for albumin?

~50% of calcium is protein-bound (mainly albumin). Low albumin reduces total calcium without affecting ionized (active) calcium. Correction estimates the true calcemia.

When is ionized calcium preferred?

Ionized calcium is the gold standard in critically ill patients, those with acid-base disorders, or when accurate assessment is essential (bypasses albumin issue).

What are symptoms of hypocalcemia?

Chvostek sign (facial twitch on tapping facial nerve), Trousseau sign (carpal spasm with BP cuff), tetany, perioral numbness, prolonged QTc, seizures.

Calcium Correction for Albumin Calculator

Calculate corrected calcium for hypoalbuminemia: corrected Ca = measured Ca + 0.8 × (4 - albumin).

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Frequently Asked Questions

Why correct calcium for albumin?

When is ionized calcium preferred?

What are symptoms of hypocalcemia?