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Medical Calculations

How to Figure Body Surface Area?

Use the Mosteller formula: BSA = √ Measure height in centimeters Measure weight in kilograms Multiply height by weight Divide the result by 3600 Take the square root of...

How to Compute BSA?

BSA = sqrt((Height in cm × Weight in kg) / 3600) BSA = sqrt((Height in inches × Weight in pounds) / 3131) BSA = 0.007184 ×...

How to Calculate Minute Ventilation?

Minute ventilation = tidal volume × respiratory rate Measure tidal volume in liters per breath or milliliters per breath Measure respiratory rate in breaths per minute Convert...

How To Calculate Drops Per Minute?

Determine the total volume to be infused in mL Determine the total time in minutes Find the drop factor of the IV tubing in gtt/mL Use the...

How To Calculate Stroke Volume?

Stroke volume = End-diastolic volume − End-systolic volume SV = EDV − ESV Measure the volume of blood in the ventricle at the end of filling Measure...

How To Calculate Cardiac Output?

Cardiac Output = Stroke Volume × Heart Rate CO = SV × HR Measure stroke volume in mL/beat Measure heart rate in beats/min Multiply stroke volume by heart...

How To Calculate ANC?

ANC = WBC × (% neutrophils + % bands) / 100 Convert the percentages to a decimal if needed Use the absolute neutrophil count formula: ANC =...

How To Calculate Anion Gap?

Anion gap = Na⁺ − (Cl⁻ + HCO₃⁻) Use serum sodium, chloride, and bicarbonate values Normal anion gap is typically about 8–12 mEq/L without potassium If potassium...

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