1 × Dose or Rate Formula
- O = Dose ordered
- V = Volume of dose available
- A = Dose available
1. Dr. Smith has ordered a heparin infusion of 1,000 units/hour (u/hr) for John Doe in bed 7. The infusion is to be mixed as 25,000 units (u) in 500 milliliters (mL) .9% NS. What rate will the IV pump be set to? In this example,
- Dose ordered = 1,000 u
- Volume of dose available = 500 mL
- Dose available = 25,000 u
The answer is an infusion at = 20 mL/hr.
2. Give 40 milligrams (mg) of Lasix® (furosemide) IVP. The vial of Lasix® contains 100 mg per 10 mL. In the example,
- Dose ordered = 40 mg
- Volume of dose available = 10 mL
- Dose available = 100 mg
The answer is a 1 × dose of = 4 mL.
- Munday, L. D., & Curren, A. M. (1990). Math for meds: Dosages and solutions. (6th ed.). San Diego, CA: Wallcur Inc.
- Gage, C. B., & Toney-Butler, T. J. (2017). Dose Calculation.