Corrected Calcium Calculator (Albumin-Corrected)

Corrected calcium is a calculated estimate that adjusts total calcium for albumin levels. It's used because albumin binds calcium, so low albumin can make total calcium appear lower than it actually is. This is an estimate, not a direct measurement.

This calculator uses the Payne formula: corrected calcium = total calcium + 0.8 × (4.0 − albumin), where albumin is in g/dL. This is a commonly used standard formula in clinical practice.

No. Corrected calcium is a calculated estimate from total calcium and albumin. Ionized calcium is a direct measurement of the free, unbound calcium in your blood. They are different measurements and may not always match.

Corrected calcium is sometimes used when albumin levels are abnormal to estimate what total calcium might be if albumin were normal. However, this is an estimate and has limitations. Your healthcare provider will interpret your lab results in context of your overall health.

Use the units that match your lab report. For calcium, labs typically report in mg/dL (US) or mmol/L (international). For albumin, labs typically report in g/dL (US) or g/L (international). The calculator handles conversions automatically.

This calculator does not provide normal ranges. If you want to compare your corrected value, you can optionally enter your lab's reference range. Reference ranges vary by lab and individual factors, so always use the range provided by your lab and interpreted by your healthcare provider.

No. This calculator is for educational purposes only. It does not provide medical advice, diagnosis, or treatment recommendations. Always discuss your lab results with your healthcare provider.

Corrected calcium is a calculated estimate with limitations. It should not be used for diagnosis or treatment decisions. Your healthcare provider will interpret your actual lab results in the context of your health.