Corrected Magnesium Calculator
Calculate corrected magnesium level for patients with hypoalbuminemia using the Kroll-Elin formula
Calculate Corrected Magnesium
Laboratory serum magnesium measurement
Serum albumin concentration
Corrected Magnesium Results
Formula used: Corrected Mg = Serum Mg + 0.005 × (40 - Albumin)
Input values: Mg: 0.00 mEq/L, Albumin: 0.0 g/L
Correction amount: 0.000 mEq/L
Normal range: 1.3-2.1 mEq/L (0.65-1.25 mmol/L)
Clinical Significance
Example Calculation
Patient with Hypoalbuminemia
Clinical scenario: 65-year-old patient with liver cirrhosis
Serum magnesium: 1.2 mEq/L (appears low)
Serum albumin: 25 g/L (hypoalbuminemia)
Note: Low albumin may cause falsely low magnesium
Corrected Calculation
Corrected Mg = 1.2 + 0.005 × (40 - 25)
Corrected Mg = 1.2 + 0.005 × 15
Corrected Mg = 1.2 + 0.075
Corrected Mg = 1.275 mEq/L (Normal range)
Result: No magnesium supplementation needed
Magnesium Functions
Enzyme Cofactor
Essential for 300+ enzymatic reactions
Cardiac Function
Enables cardiomyocyte contraction
Blood Clotting
Stabilizes platelets in blood
⚠️ Medical Disclaimer
This calculator is for educational purposes only and should not replace professional medical judgment.
Always consult with a qualified healthcare provider for proper interpretation of laboratory results and treatment decisions.
Clinical correlation is essential for accurate patient assessment.
Understanding Corrected Magnesium
What is Corrected Magnesium?
Corrected magnesium accounts for low albumin levels that can cause falsely low serum magnesium readings. Since 30% of serum magnesium is bound to proteins (mainly albumin), hypoalbuminemia reduces total magnesium levels while free, biologically active magnesium may remain normal.
Why Correction is Necessary
- •Only free magnesium (70%) is biologically active
- •Bound magnesium (30%) depends on albumin levels
- •Prevents unnecessary magnesium supplementation
- •Provides accurate assessment of magnesium status
Kroll-Elin Formula
Corrected Mg = Serum Mg + 0.005 × (40 - Albumin)
- Corrected Mg: Albumin-corrected magnesium level
- Serum Mg: Laboratory measured magnesium
- 40: Reference albumin level (g/L)
- 0.005: Correction factor
When to Use
- •Albumin < 35 g/L (hypoalbuminemia)
- •Liver disease or cirrhosis
- •Nephrotic syndrome
- •Malnutrition or severe inflammation
Hypomagnesemia Symptoms
Electrolyte Abnormalities
- • Hypocalcemia (resistant to treatment)
- • Hypokalemia (resistant to treatment)
- • Hypophosphatemia
Clinical Manifestations
- • Heart arrhythmias and ECG changes
- • Muscle weakness and tremor
- • Tetany (involuntary muscle contractions)