Corrected Calcium Calculator
Calculate albumin-corrected serum calcium to account for hypoalbuminemia using the standard correction formula.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Normal total Ca: 8.5–10.5 mg/dL; hypocalcemia: <8.5; hypercalcemia: >10.5 mg/dL
Normal albumin: 3.5–5.0 g/dL; correction: +0.8 mg/dL Ca per 1 g/dL drop in albumin
Results
Corrected Calcium
9mg/dL
How to Use This Calculator
- Enter measured serum calcium (mg/dL) and serum albumin (g/dL).
- Review Corrected Calcium, Correction Amount, and Classification (hypocalcemia, normal, or hypercalcemia).
- Always correct calcium for albumin before interpreting total calcium in hypoalbuminemic patients.
How the result changes with Measured Calcium
| Measured Calcium | Corrected Calcium |
|---|---|
| 2.9 | 2.9mg/dL |
| 7.65 | 7.65mg/dL |
| 13 | 13mg/dL |
| 18 | 18mg/dL |
What each input means
- Measured Calcium
- Total serum calcium as reported by the lab in mg/dL. Correction formula: corrected Ca = measured Ca + 0.8 × (4.0 − albumin). Normal total calcium range is 8.5–10.5 mg/dL.
- Serum Albumin
- Serum albumin level in g/dL. Each 1 g/dL decrease in albumin below 4.0 g/dL lowers total calcium by ~0.8 mg/dL without affecting ionized (active) calcium. Normal range 3.5–5.0 g/dL.
How this is calculated
Worked example, using the default values
- Identify Input ParametersMeasured Calcium = 9, Serum Albumin = 4 = 2 input(s) provided
- Calculate Corrected CalciumCorrected Calcium9 = 9
- Calculate Correction AmountCorrection Amount0 = 0
- Calculate Measured CalciumMeasured Calcium9 = 9
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