The Corrected Calcium Calculator adjusts total serum calcium levels to account for hypoalbuminemia, ensuring accurate diagnosis of hypercalcemia or hypocalcemia. Essential for patients with liver disease, malnutrition, or kidney disorders.
Formula:
Conventional Units (mg/dL):
Corrected Calcium (mg/dL) = Total Calcium (mg/dL) + 0.8 × (4 – Albumin (g/dL))
SI Units (mmol/L):
Corrected Calcium (mmol/L) = Total Calcium (mmol/L) + 0.02 × (40 – Albumin (g/L))
🧮 Corrected Calcium Calculator
📐 Formulas:
- Conventional Units (mg/dL): Corrected Calcium = Total Calcium + 0.8 × (4 - Albumin)
- SI Units (mmol/L): Corrected Calcium = Total Calcium + 0.02 × (40 - Albumin)
📊 Unit Conversion:
- mg/dL to mmol/L: Calcium (mg/dL) / 4
- mmol/L to mg/dL: Calcium (mmol/L ) * 4
- g/dL to g/L: Albumin (g/dl) * 10
- g/L to g/dL: Albumin (g/L) / 10
⚙️ Select Unit:
How to Use the Calculator
Input Values:
- Total Calcium (from lab results, in mg/dL or mmol/L).
- Albumin (from lab results, in g/dL or g/L).
📊 Unit Conversion:
| Conversion | Formula | Example |
|---|---|---|
| Calcium (mg/dL → mmol/L) | mmol/L = mg/dL ÷ 4 | 9.0 mg/dL → 2.25 mmol/L |
| Calcium (mmol/L → mg/dL) | mg/dL = mmol/L × 4 | 2.25 mmol/L → 9.0 mg/dL |
| Albumin (g/dL → g/L) | g/L = g/dL × 10 | 3.2 g/dL → 32 g/L |
| Albumin (g/L → g/dL) | g/dL = g/L ÷ 10 | 32 g/L → 3.2 g/dL |
Example Calculation:
Total Calcium: 9.0 mg/dl or 2.25 mmol/L
Albumin: 3.2 g/dl or 32 mmol/L
Corrected Calcium (mg/dL) = Total Calcium (mg/dL) + 0.8 × (4 – Albumin (g/dL))
Corrected Calcium (mmol/L) = Total Calcium (mmol/L) + 0.02 × (40 – Albumin (g/L))
Corrected Calcium (mg/dL) = 9.0 (mg/dL) + 0.8 × (4 – 3.2 (g/dL))
Corrected Calcium (mmol/L) = 2.25 (mmol/L) + 0.02 × (40 – 32 (g/L))
Corrected Calcium (mg/dL) = 9.0 + 0.8 × (4 – 3.2) = 9.6 mg/dL
Corrected Calcium (mmol/L) = 2.25 + 0.02 × (40 – 32 ) = 2.4 mmol/L
Normal Calcium Ranges
| Parameter | Normal Range |
|---|---|
| Total Calcium | 8.5–10.5 mg/dL |
| Corrected Calcium | 8.5–10.5 mg/dL |
| Albumin | 3.5–5.5 g/dL |
Clinical Interpretation
| Condition | Corrected Calcium | Albumin | Action |
|---|---|---|---|
| Hypoalbuminemia | Adjusts total calcium | <3.5 g/dL | Rule out hypocalcemia |
| Hypercalcemia | >10.5 mg/dL | Any | Investigate malignancy/PTH |
| Hypocalcemia | <8.5 mg/dL | Any | Check PTH, vitamin D |
Why Correct Calcium?
- Albumin binds calcium: Low albumin falsely lowers total calcium.
- Critical conditions: Liver disease, nephrotic syndrome, malnutrition.
- Accurate diagnosis: Prevents missing hypercalcemia/hypocalcemia.
Key Notes
- Unit Consistency:
- Use mg/dL for calcium and g/dL for albumin in the standard formula.
- Limitations:
- Ionized calcium is more accurate in critical illness or acid-base imbalances.
- Does not replace clinical judgment.
