Heparin Calculations Flashcards

Weight-based Heparin Protocol Calculations

• Infusion Rate Calculation: For an order to infuse 1,000 units/hr of heparin from a solution of 1,000 mL 0.45% NS with 25,000 units of heparin, utilize the formula D/H * Q = x.

• Example Calculation:

  • D = 1,000 units (desired dosage)
  • H = 25,000 units (available dosage)
  • Q = 100 mL (total volume)
  • Calculation: 1,000/25,000 * 100 = 40 mL/hr.

• Dosage Calculation at a Specific Rate: When infusing D5 0.9% NS 1,000 mL with 25,000 units of heparin at a rate of 35 mL/hr, use H/D * Q = x.

• Example Calculation:

  • H = 25,000 units
  • D = 1,000 mL (total volume)
  • Q = 35 mL/hr.
  • Calculation: 35/1,000 * 25,000 = 875 units/hr.

Additional Dosage Calculation Scenarios

• High Rate Infusion: For infusing D5W 1,000 mL with 25,000 units of heparin at 100 mL/hr, again apply D/H * Q = x.
• Example Calculation:
  • H = 25,000 units
  • D = 1,000 mL
  • Q = 100 mL/hr.
  • Calculation: 1,000 mL/25,000 * 100 = 25,000 units/hr.

General Formula Reference

• Key Formulas:
  • D/H * Q = x (for finding the infusion rate)
  • H/D * Q = x (for calculating the dosage in units/hr)