Corrected Calcium Calculator (Albumin Adjusted)
About 40 percent of calcium rides on albumin. When albumin is low or high, total calcium misleads. Labs correct it with a simple formula; this does the same and tells you whether the corrected value is inside range.
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What is the corrected calcium formula?
Corrected calcium (mmol/L) = measured calcium + 0.02 × (40 − albumin in g/L). In mg/dL: measured calcium + 0.8 × (4.0 − albumin in g/dL).
What is a normal corrected calcium?
Roughly 2.10 to 2.60 mmol/L (8.5 to 10.5 mg/dL). Persistent results above 2.60 usually prompt a parathyroid hormone test.
When is the correction unreliable?
In very sick patients, with abnormal blood pH, or when albumin is extremely low. Ionised calcium is the better test then.
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Educational tool. Results depend on the accuracy of the inputs and the formulas cited; they do not replace your laboratory report or your doctor's interpretation.