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Table 1 Weight-based nomogram for continuous intra-vascular UFH infusion

From: The use of activated partial thromboplastin time versus antifactor Xa assay in monitoring continuous unfractionated heparin infusion therapy in obstetric intensive care unit

aPTT Dose adjustment
Less than 35 s 80 U/kg re-bolus and increase infusion rate by 4 U/kg/h
35–49 s 40 U/kg re-bolus and increase rate by 2 U/kg/h
50–70 s No change
71–90 s Decrease infusion rate by 2 U/kg/h
More than 90 s Hold infusion for 1 h and decrease infusion rate by 4 U/kg/h