Question

    5. A patient is receiving 15 mL/hour using a 20 drop set. How many drops per minute will be administered?

    6. A medication is set to flow at 35 mL/hour using a mini-drip set. How many drops per            minute will be administered?

    7. An order for 500 mg of a drug mixed in a 100 mL bag is set to flow over 30 minutes. Using a 30 drop set, how many drops per minute will be administered?

    8. How many liters will be delivered over 24 hours if the flow rate is 17 gtt/min using a 20 drop set?

    9. How long will a 2 L bag last if the patient receives 40 gtt/min using a 20 drop set?

Determine the infusion rates in drops per minute for the following orders.

10. Give 210 mL over 45 minutes using a 10 drop set.

Answer 1

5) Drops per min(gtt/min).

gtt/min = Volume(ml)/Time(min) * Drop factor(gtt/ml).

Here

Volume(ml) = 15 ml.

Time(min) = 60 min (1hr).

Drop factor(gtt/ml) = 20 gtt/ml.

As per above formula

gtt/min = 15/60 * 20

= 0.25 * 20

= 5 gtt/min.

6) Calculation of drops per min(gtt/min).

gtt/min = Volume(ml)/Time(min) * Drop factor(gtt/ml).

Here

Volume(ml) = 35 ml.

Time(min) = 60 min ( 1hr).

Drop factor(gtt/ml) = 60 gtt/ml (mini drip set drop factor is 60).

As per above formula

gtt/min = 35/60 * 60

= 0.58 * 60

= 34.8 gtt/min.

7) Calculation of drops per min(gtt/min).

gtt/min = Volume(ml)/Time(min) * Drop factor(gtt/ml).

Here

Volume(ml) = 100 ml.

Time(min) = 30 min.

Drop factor = 30 gtt/ml.

As per above formula

gtt/min = 100/30 * 30

= 3.33 * 30

= 100 gtt/min.

8) Calculation of volume in liter.

gtt/min = Volume(ml) / Time(min) * Drop factor(gtt/ml).

Volume(ml) = gtt/min * Time(min) / Drop factor (gtt/ml).

Here

gtt/min = 17 gtt/min.

Time(min) = 1440 min ( 24 hr * 60 min).

Drop factor(gtt/ml) = 20 gtt/ml.

As per above formula

Volume(ml) = 17 * 1440 / 20

= 24480 / 20

= 1224 ml.

1 ml = 0.001 l.

So

Volume (L) = 1224 * 0.001

= 1.2 L.

9) Calculation of time(min).

gtt/min = Volume(ml)/Time(min) * Drop factor(gtt/ml).

So

Time(min) = Volume(ml) / gtt/min * Drop factor(gtt/ml).

Here

Volume(ml) = 2000 ml ( 2L).

gtt/min = 40 gtt/min.

Drop factor = 20 gtt/ml.

As per above formula

Time(min) = 2000/40 * 20

= 50 * 20

= 1000 min.

10) Calculation of flow rate(gtt/min).

gtt/min = Volume(ml)/Time(min) * Drop factor(gtt/ml).

Here

Volume(ml) = 210 ml.

Time(min) = 45 min.

Drop factor(gtt/ml) = 10 gtt/ml.

As per above formula

gtt/min = 210/45 * 10

= 4.67 * 10

= 46.7 gtt/min.