Why do we correct calcium for albumin?

About half of serum calcium is bound to albumin. If albumin levels are low, the total measured calcium will be low even if the active (ionized) calcium is normal.

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医疗DoctorMedical Laboratory Scientist

Corrected Calcium Calculator

Calculate serum calcium levels corrected for albumin, providing a more accurate reflection of physiologically active calcium.

Calcium is essential for bone health, nerve signaling, and muscle function. However, standard lab tests measure 'total' calcium, which includes calcium bound to proteins like albumin. If albumin is low, the total calcium result can be misleading. This calculator 'corrects' the calcium level to show what it would be if the patient had normal albumin levels.

仅供教育用途。该工具不能取代临床判断或当地协议。仅供教育用途。该工具不能取代临床判断或当地协议。

Measured calcium

Albumin (g/L)

Calcium units

Albumin input stays g/L; conversion handled automatically.

Corrected calcium

2.2mmol/L

Corrected Calcium is 2.2 mmol/L

Ca + 0.02 * (40 - Alb) = 2.1 + 0.02 * (40 - 35)

Measured calcium2.1 mmol/L

Albumin (g/L)35 g/L

Unitsmmol/L

工作原理

The tool uses the standard Payne formula, which adds a correction factor for every unit that the patient's albumin is below the normal reference (usually 4.0 g/dL or 40 g/L).

计算公式

Ca_corr = Ca_meas + 0.8 × (4.0 - Albumin)

计算示例

1. **Low Protein**: Ca 8.0, Albumin 2.0 = **9.6 (Normal)**.

为什么在日常生活中使用这个工具？

避免不必要的治疗。这项服务可以防止对实际上不需要的患者进行危险且昂贵的静脉钙注射，从而保持电解质管理的安全和基于证据。避免不必要的治疗。这项服务可以防止对实际上不需要的患者进行危险且昂贵的静脉钙注射，从而保持电解质管理的安全和基于证据。

常见问题解答

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