Question

Complete dosage calculation for patient who weighs 145 lb. The medication comes in an IV piggyback bag with the drug label below. Determine how many mL the patient will need for this order. What is the rate you will enter on the IV pump? Mannitol 1 g/kg IV over 60 minutes mL needed: IV Pump rate: 20% MANNITOL MANNITOL INJECTION USE

Answer 1

ANSWER.

* Calculation of volume(ml) of drug required.

      Volume(ml) = Desired dose(D)/Dose in hand(H) * Quantity(Q).

Here

        Ordered dose = 1 g/kg

        Weight of the patient = 145 lb.

Convert lb to kg for calculation

            1 lb = 0.454 kg

    So

        Weight of the patient in kg = 145 * 0.454

                                                   = 65.8 kg.

       Desired dose(D) = 1 * 65.8

                                    = 65.8 g.

       Dose in hand(H) = 20 g.

            Quantity(Q) = 100 ml.

As per above formula

      Volume(ml) of drug required = D/H * Q

                                                    = 65.8/20 * 100

                                                    = 3.3 * 100

                                                    = 330 ml.

* Calculation of IV pump rate (ml/hr).

         Rate(ml/hr) = Volume(ml) / Time(hr).

    Here

        Volume(ml) = 330 ml.

        Time(hr) = 1 hr (60 min).

As per above formula

         Rate (ml/hr) = 330/1

                              = 330 ml/hr.