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Calcimator

Electrolyte Panel Calculator

Calculate anion gap, BUN/creatinine ratio, and serum osmolality from a basic metabolic panel (BMP) for electrolyte assessment.

Inputs

mEq/L
mEq/L
mEq/L
mEq/L
mg/dL
mg/dL
mg/dL

Results

Anion Gap

14 mEq/L (normal 8-12)

BUN/Creatinine Ratio

15 (normal 10-20)

Calculated Osmolality290.9 mOsm/kg (normal 275-295)
Osmolal Gap0 mOsm/kg (compare to measured)
How to Use This Calculator
  1. Enter serum sodium (mEq/L), potassium (mEq/L), chloride (mEq/L), and bicarbonate (mEq/L).
  2. Review the calculated anion gap: AG = Na - (Cl + HCO3); normal = 8-12 mEq/L.
  3. If AG is elevated, note the delta gap and possible corrected bicarbonate.
  4. Check each value against the reference range for critical value alerts.
  5. Correlate electrolyte abnormalities with patient medications, hydration status, and clinical picture.

How the result changes with Sodium (Na+)

Sodium (Na+)Anion GapBUN/Creatinine Ratio
108-18 mEq/L (normal 8-12)15 (normal 10-20)
1282 mEq/L (normal 8-12)15 (normal 10-20)
15226 mEq/L (normal 8-12)15 (normal 10-20)
17246 mEq/L (normal 8-12)15 (normal 10-20)

What each input means

Sodium (Na+)
Serum sodium level (normal 136-145 mEq/L).
Potassium (K+)
Serum potassium level (normal 3.5-5.0 mEq/L).
Chloride (Cl-)
Serum chloride level (normal 98-106 mEq/L).
Bicarbonate (HCO3-)
Serum bicarbonate / CO2 level (normal 22-29 mEq/L).
BUN
Blood urea nitrogen level (normal 7-20 mg/dL).
Creatinine
Serum creatinine level (normal 0.7-1.3 mg/dL).
Glucose
Blood glucose level (fasting normal 70-100 mg/dL).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Sodium (Na+) = 140, Potassium (K+) = 4.2, Chloride (Cl-) = 102, Bicarbonate (HCO3-) = 24 = 7 input(s) provided
  2. Calculate Anion Gap
    Anion Gap
    14 = 14
  3. Calculate BUN/Creatinine Ratio
    BUN/Creatinine Ratio
    15 = 15
  4. Calculate Calculated Osmolality
    Calculated Osmolality
    290.9 = 290.9
  5. Calculate Osmolal Gap
    Osmolal Gap
    0 = 0

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