Convert mL/hr to mcg/min

Formulas

First, determine the dosage given milligrams/hour (mg/hr).

R × A V
  • R = Rate
  • A = Dose available
  • V = Volume of dose available

Next, convert dosage from mg/hr to microgram/minute (mcg/min).

D × 1000 mg 60 min
  • D = Dose (mg)

Example

A patient is on a norepinephrine drip infusing at 56 mL/hr.  There is no titration table table at the bedside.  The IV bag is labeled 32 mg norepinephrine in 500 mL Dextrose 5%.  How many mcg/min is the patient receiving?

  • Rate = 56 mL
  • Dose available = 32 mg
  • Volume of dose available = 500 mL
56 mL × 32 mg 500 mL

The patient's dosage is 3.58 mg/hr. Next, convert dosage from 3.58 mg/hr to mcg/min.

  • Dose (mg) = 3.58 mg
3.58 mg × 1000 mg 60 min

The patient's norepinephrine dosage is 59.73 mcg/min which is a higher than recommended dose!!!