Heparin Weight-Based Protocol (DVT/PE & ACS)

Calculates unfractionated heparin dosing by indication. DVT/PE: bolus 80 units/kg + infusion 18 units/kg/h. ACS (NSTEMI/UA): bolus 60 units/kg (max 4,000 units) + infusion 12 units/kg/h (max 1,000 units/h). Target aPTT 60–100 seconds (1.5–2.5× normal). Adjust per institutional aPTT-based titration nomogram.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How to Use

Enter the values for the scenario you are assessing. Calculates unfractionated heparin dosing by indication. DVT/PE: bolus 80 units/kg + infusion 18 units/kg/h. ACS (NSTEMI/UA): bolus 60 units/kg (max 4,000 units) + infusion 12 units/kg/h (max 1,000 units/h). Target aPTT 60–100 seconds (1.5–2.5× normal). Adjust per institutional aPTT-based titration nomogram. Use the heparin protocol result to inform your calculation.

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