Corrected Calcium Calculator
Calculate corrected calcium levels for patients with low albumin.
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Formula
Calculates the physiologically active calcium level when albumin is low.
Worked Example
Corrected Calcium Explained
- The formula: Corrected Calcium (mg/dL) = Measured Calcium (mg/dL) + 0.8 * [4.0 - Albumin (g/dL)]
- Use this calculator when serum albumin is less than 4.0 g/dL
- Normal total calcium range is typically 8.5 to 10.5 mg/dL
- Ionized calcium is the physiologically active form, but total calcium corrected for albumin is a common surrogate
Always correlate calculator results with the patient's clinical status. If results are critical, an ionized calcium level should be measured directly.
You can also calculate changes using our Anion Gap Calculator or Creatinine Clearance Calculator.
Frequently Asked Questions
What is corrected calcium?
Corrected calcium is an estimate of what the total calcium would be if the albumin level were normal (4.0 g/dL). It helps clinicians interpret calcium levels in patients with low protein.
Why does albumin affect calcium?
Calcium binds to albumin. If there is less albumin, there is less total calcium even if the free, active calcium remains unchanged.
Is corrected calcium the same as ionized calcium?
No. Corrected calcium is an estimate based on total calcium and albumin. Ionized calcium is a direct measurement of free calcium and is more accurate but harder to measure.
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