Need help with Med Math

[SN09]

I'm stuck on these practice problems, I dont even know where to start. Can anyone help me. I have my math test coming up soon and I want to be well prepared for it. Thank you very much.

1. Order 1000cc D5W over 8 hrs. Administration set: 15 gtts/mL. After 4 hrs. of infusion, 700 mL have infused; how should you adjust the drip rate to complete the infusion on time? Answer 18-19 gtts/min.

2. Order 1000cc 0.45%NS at 75 mL/hr. Administration set: 20 gtts/Ml. How should you regulate the IV? Answer 25 gtts/min.

3. Ordered: Morphine sulfate 40 mg in 250 mL to infuse at 3 mg/h. How many CC's per hr will the infusion run? Answer 18.75 ml/hr

[Daytonite, BSN, RN]

order 1000cc d5w over 8 hrs. administration set: 15 gtts/ml. after 4 hrs. of infusion, 700 ml have infused; how should you adjust the drip rate to complete the infusion on time? answer 18-19 gtts/min.

1000 cc - 700 ml = 300 ml to be infused in 4 hours.

300 ml/4 hours

(amount to be infused)

x 15 gtts/ml

(drip factor of iv tubing)

x 1 hour/60 minutes

(conversion factor)

= 18.75 gtts/minute

, rounded up to

19 gtts/minute

(drip rate)

note:

drops must be expressed in whole numbers. there are no such things are fractions of drops in iv therapy.

order 1000cc 0.45%ns at 75 ml/hr. administration set: 20 gtts/ml. how should you regulate the iv? answer 25 gtts/min.

75 ml/hour

(infusion rate)

x 20 gtts/ml

(drip factor of iv tubing)

x 1 hour/60 minutes

(conversion factor)

=

25 gtts/minute

(drip rate)

ordered: morphine sulfate 40 mg in 250 ml to infuse at 3 mg/h. how many cc's per hr will the infusion run? answer 18.75 ml/hr

you must know that ml are equal to cc's.

250 ml/40 mg

(dose on hand)

x 3 mg/hour

(dose given)

=

18.75 ml/hour

(rate of infusion)

note:

in the real world, this would be on an iv pump and would be rounded off to infuse at 19 ml/hour.

[SN09]

Thank you "Daytonite", this helps me out so much!:lvan: