Nephrology · Internal Medicine

Estimated Ionized Calcium (Payne) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Ica Total Calcium Mg Dl (mg/dL)

Ica Albumin G Dl (g/dL)

Result

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Formula inputs

Ica Total Calcium Mg Dl (mg/dL)Accepted range: 4 to 16
Ica Albumin G Dl (g/dL)Accepted range: 1 to 6

Primary source

Payne RB et al. Interpretation of serum calcium in patients with abnormal serum proteins. BMJ. DOI: 10.1136/bmj.4.5893.643. PMID: 4701932. Scope: Albumin-adjusted total calcium estimate (mg/dL) = measured calcium − 0.8 × (albumin − 4 g/dL). (1973)

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