Calculator
Heparin Protocol
Weight-based unfractionated heparin: initial bolus and maintenance infusion using standard 25 000 U / 50 cc syringe. Indication-specific dosing with hard maximum caps.
Bolus = U/kg × weight (capped) · Maintenance = U/kg/h × weight ÷ concentration (capped)
kg
U
cc
U/kg
Default 60 U/kg · max 4,000 U total.
U/kg/h
Default 12 U/kg/h · max 1,000 U/hr. Adjust against aPTT 1.5–2.5× control.
Check baseline aPTT, PT/INR, platelets, creatinine. Recheck aPTT 6 h after start and after every dose change.
Initial bolus
—Units
Bolus volume to push
—cc
Maintenance infusion
—cc / hr
= units / hr & mass equivalent
—
Enter weight to compute bolus and infusion rate.