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Need Help With Critical Care Calculation


Specializes in Ortho and Tele med/surg.

This is the problem: Ordered: 10 mg/kg of Methylprednisolone (Solu-Medrol) IV over 20 minutes. Solution available is Methylprednisolone 1 g in 100 mL of Normal Saline. The patient weighs 154 lbs. What rate (ml/hr) will the IV pump be set at?

Thank You sooooooo much!

Daytonite, BSN, RN

Specializes in med/surg, telemetry, IV therapy, mgmt. Has 40 years experience.

ordered: 10 mg/kg of methylprednisolone (solu-medrol) iv over 20 minutes. solution available is methylprednisolone 1 g in 100 ml of normal saline. the patient weighs 154 lbs. what rate (ml/hr) will the iv pump be set at?

iv pumps are always set at ml/hour.

10 mg/20 minutes
(dose desired)
x 154 pounds/2.2 pounds
(weight conversion to kg)
x 100 ml/1 gram
(dose on hand)
x 1 gram/1000 mg
(conversion factor)
x 60 minutes/1 hour
(conversion factor)
210 ml/hour
(rate to set the iv pump)

an easier way to do this is to covert the pounds to kg (70 kg). multiply it by the
10 mg/
. that gives you the dose desired (700 mg). your dose on hand is
1 g in 100 ml of normal saline
1000 mg in 100 ml of normal saline
. using
dose desired divided by dose on hand multiplied by the amount the dose on hand comes in
formula you get 700mg/1000mg x 100 ml = 70 ml to be given over 20 minutes. since the pump has to be set for one hour, 70 ml/20 minutes =
ml/60 minutes. cross multiply to find
210 ml


Specializes in Ortho and Tele med/surg.

Thank you sooo much!

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