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Albumin-Adjusted Calcium (Payne Formula) Calculator — result sheet
Estimate albumin-adjusted total calcium with the classic Payne equation while showing why ionized calcium and local laboratory methods still matter.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Payne albumin-adjusted calcium (mg/dL) = measured total calcium − albumin + 4.0. This is the classic equation for the stated units.
The page calculates the classic Payne adjustment and labels it as an estimate rather than a direct ionized-calcium measurement. Modern assay methods and patient conditions can change how well an adjustment reflects biologically active calcium.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Measured total calcium — mg/dL; minimum 0.1; maximum 30
- Serum albumin — g/dL; minimum 0.1; maximum 10
Worked example
| Input | Value |
|---|---|
| Measured total calcium | 8.5 |
| Serum albumin | 3 |
Adjusted calcium = 8.5 − 3.0 + 4.0 = 9.5 mg/dL.
Assumptions and limits
- Total calcium is entered in mg/dL and albumin in g/dL.
- The equation is the classic Payne form: calcium − albumin + 4.0.
- The result is an albumin-adjusted estimate, not a measurement of ionized calcium.
- The original relationship was derived in a defined laboratory and patient sample; local methods may differ.
- Abnormal pH, kidney disease, critical illness, abnormal proteins, and assay differences can limit the estimate.
- The result is not a diagnosis of hypocalcemia, hypercalcemia, or parathyroid disease.
- The page does not select calcium replacement, fluid treatment, or an emergency response.
- A laboratory or clinician may prefer a locally validated equation or direct ionized calcium measurement.
- Convert units separately and verify the laboratory’s reference method before clinical use.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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