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Determine Albumin Deficit

Mg 1.2, Albumin 2.0 g/dL

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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended

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Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.

How: Enter your values above and the calculator will apply validated formulas to compute your results.

Evidence-based calculationsUsed in clinical settings worldwide
Sources:Medical LiteratureWHO Guidelines

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Understanding Determine Albumin DeficitUse the calculator below to check your health metrics

Hypoalbuminemia + Low Mg

Mg 1.2, Albumin 2.0 g/dL

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Alcohol Use Disorder

Mg 1.4, Albumin 2.5 g/dL

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ICU Patient

Mg 1.6, Albumin 2.2 g/dL

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Cardiac Arrhythmia

Mg 1.5, Albumin 3.0 g/dL

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Normal Values

Mg 2.0, Albumin 4.0 g/dL

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Clinical Scenarios

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Hypoalbuminemia + Low Mg

Mg 1.2, Albumin 2.0 g/dL

Cirrhosis patient with apparent hypomagnesemia

Alcohol Use Disorder

Mg 1.4, Albumin 2.5 g/dL

Chronic alcohol use with malnutrition

ICU Patient

Mg 1.6, Albumin 2.2 g/dL

Critically ill with multiple organ dysfunction

Cardiac Arrhythmia

Mg 1.5, Albumin 3.0 g/dL

New onset atrial fibrillation

Normal Values

Mg 2.0, Albumin 4.0 g/dL

Routine screening - normal albumin

Lab Values

Serum magnesium
mg/dL
Serum albumin
g/dL
Unit system

Clinical Context

Patient age group
Reason for testing
Current symptoms

Corrected Magnesium Results

1.57

mg/dL (Corrected)

Hypomagnesemia
+0.07
Correction (mg/dL)

Minimal

Clinical Impact
Measured magnesium 1.50 mg/dL with albumin 2.5 g/dL corrects to 1.57 mg/dL. The low albumin was masking true magnesium status by 0.07 mg/dL.

Possible Symptoms

  • Muscle weakness and cramps
  • Tremors and twitching
  • Paresthesias
  • Cardiac arrhythmias (esp. with digoxin)
  • Hypokalemia and hypocalcemia
  • Personality changes

Recommendations

  • Check ionized magnesium if available
  • Check calcium and potassium levels
  • IV replacement if symptomatic: MgSO4 1-2g over 1-2 hours
  • Oral replacement if mild: Mg oxide 400-800mg daily
  • Identify and treat underlying cause

Magnesium Analysis

Measured vs Corrected

Reference Ranges

Step-by-Step Calculations

Step 1: Determine Albumin Deficit

Formula: ext{Albumin} ext{Deficit} = 4.0 - ext{Measured} ext{Albumin}

Calculation: Albumin Deficit = 4.0 - 2.5

Result: 1.5 g/dL

Step 2: Apply Correction Formula

Formula: ext{Corrected} ext{Mg} = ext{Measured} ext{Mg} + 0.005 imes (40 - ext{Albumin} ext{in} g/L)

Calculation: Corrected Mg = 1.50 + 0.05 × 1.5

Result: 1.57 mg/dL

Step 3: Calculate Correction Amount

Formula: ext{Correction} = ext{Corrected} ext{Mg} - ext{Measured} ext{Mg}

Calculation: Correction = 1.57 - 1.50

Result: +0.07 mg/dL

Step 4: Interpret Result

Formula: ext{Normal} ext{range}: 1.7-2.4 ext{mg}/ ext{dL}

Calculation: 1.57 mg/dL vs normal range

Result: Hypomagnesemia

Reference Ranges

ParameterLowNormalHigh
Magnesium (mg/dL)<1.71.7-2.4>2.4
Magnesium (mmol/L)<0.70.7-1.0>1.0
Magnesium (mEq/L)<1.41.4-2.0>2.0

Causes of Magnesium Disorders

CategoryHypomagnesemia CausesHypermagnesemia Causes
GI LossDiarrhea, malabsorption, short bowel, pancreatitis, PPI useExcessive antacid use (Mg-containing)
Renal LossDiuretics, Gitelman syndrome, Bartter syndrome, aminoglycosides, cisplatinRenal failure (reduced excretion)
EndocrineHyperaldosteronism, hyperthyroidism, diabetes/DKAHypothyroidism, adrenal insufficiency
MedicationsPPIs, diuretics, aminoglycosides, cisplatin, amphotericin B, tacrolimusMagnesium supplements, Mg-containing laxatives, lithium
OtherAlcohol use disorder, refeeding syndrome, burns, hungry bone syndromePre-eclampsia treatment (IV MgSO4), tumor lysis syndrome

How to Interpret and Manage Magnesium Disorders

Step-by-Step Clinical Approach

  1. 1

    Measure Total Magnesium

    Standard serum magnesium test. Normal range: 1.7-2.4 mg/dL (0.7-1.0 mmol/L)

  2. 2

    Check Albumin Level

    If albumin <3.5 g/dL, apply correction formula to avoid false interpretation

  3. 3

    Assess Symptoms

    Mild: muscle cramps, weakness. Severe: tetany, arrhythmias, seizures

  4. 4

    Identify Cause

    GI loss, renal wasting, medications, or decreased intake

  5. 5

    Check Related Electrolytes

    K, Ca, PO4 - often coexist with Mg disorders

  6. 6

    Replace Appropriately

    Oral for mild, IV for severe. Continue for 24-48h after normalization

When to Check Magnesium

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Cardiac Arrhythmias

Any unexplained arrhythmia, prolonged QT, torsades de pointes, or resistant atrial fibrillation.

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Refractory Hypokalemia

Potassium won't correct despite aggressive replacement - check and correct Mg first.

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Alcohol Use Disorder

Chronic alcohol use causes GI and renal Mg wasting. Check in withdrawal and DT prevention.

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High-Risk Medications

Loop diuretics, PPIs, aminoglycosides, cisplatin, amphotericin B users.

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ICU Patients

Critically ill patients have high prevalence of hypomagnesemia. Monitor routinely.

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Pre-eclampsia Treatment

Monitor Mg levels during IV magnesium sulfate infusion to prevent toxicity.

Signs and Symptoms by Severity

SeverityMg LevelSigns/SymptomsManagement
Normal1.7-2.4 mg/dLAsymptomaticNone required
Mild Hypomagnesemia1.2-1.7 mg/dLWeakness, muscle cramps, fatigue, anorexiaOral Mg 400-800 mg/day
Moderate Hypomagnesemia1.0-1.2 mg/dLTremor, tetany, arrhythmias, hypokalemiaIV MgSO4 1-2g over 1-2h
Severe Hypomagnesemia<1.0 mg/dLSeizures, cardiac arrest, Torsades de PointesIV MgSO4 2g stat, cardiac monitoring
Mild Hypermagnesemia2.4-4.0 mg/dLNausea, flushing, hypotensionStop Mg, supportive care
Severe Hypermagnesemia>4.0 mg/dLRespiratory depression, areflexia, cardiac arrestIV calcium gluconate, consider dialysis

What is Corrected Magnesium?

Corrected magnesium adjusts the measured serum magnesium level for abnormal albumin concentrations. Like calcium, a portion of magnesium is bound to albumin, so changes in albumin can affect the total magnesium measurement without changing the ionized (active) fraction.

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Protein Binding

~25-30% of magnesium is bound to protein. Low albumin may falsely lower total magnesium while ionized magnesium remains normal.

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Ionized Magnesium

The active form that affects cellular function. Correction estimates true magnesium status when direct ionized measurement isn't available.

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Clinical Utility

Essential in hypoalbuminemia to avoid missing true hypomagnesemia or unnecessary supplementation based on falsely low values.

Correction Formula

Magnesium-Albumin Correction

Corrected Mg = Measured Mg + 0.005 × (40 - Albumin in g/L)

Or equivalently with albumin in g/dL:

Corrected Mg = Measured Mg + 0.05 × (4.0 - Albumin)

Note: The correction for magnesium is less established than for calcium. When clinical picture is unclear, check ionized magnesium directly if available.

Frequently Asked Questions

Is magnesium correction as reliable as calcium correction?

No. The magnesium-albumin relationship is less well-characterized than calcium-albumin. The correction provides an estimate but is less validated. When available, ionized magnesium is preferred.

Why is magnesium important?

Magnesium is a cofactor for over 300 enzymes, essential for ATP function, muscle contraction, nerve transmission, and cardiac rhythm. Deficiency can cause refractory hypokalemia and hypocalcemia.

What causes hypomagnesemia?

Common causes include alcohol use, diuretics, GI losses (diarrhea, malabsorption), medications (PPIs, aminoglycosides, cisplatin), diabetic ketoacidosis, and renal wasting.

How do I replace magnesium?

Mild asymptomatic: oral magnesium (oxide, gluconate) 400-800mg daily. Symptomatic or severe: IV magnesium sulfate 1-2g over 1-2 hours. Monitor cardiac rhythm during IV replacement.

Clinical Pearls

The "Forgotten" Electrolyte

Magnesium is often overlooked. Check it in any patient with hypokalemia, hypocalcemia, or cardiac arrhythmias.

Refractory Hypokalemia

Can't correct potassium? Check and correct magnesium first. Mg is required for K channel function.

Digoxin Toxicity

Hypomagnesemia increases risk of digoxin toxicity. Always check magnesium in patients on digoxin.

ICU Consideration

Critically ill patients often have low magnesium. Many intensivists target Mg >2.0 mg/dL for cardiac protection.

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Serum Osmolality

Osmolality calculation

Bicarbonate Deficit

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Free Water Deficit

Dehydration correction

For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

🏥 Health Facts

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— CDC

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