Math Practice Test Lab - Key 4 - Dosage Calculations and IV Rates

Practice Math Test - KEY
1. MD orders metoclopramide (Reglan) 5 mg IV push x 1 dose now. On hand is Reglan 10 mg/2 mLs. How
many mLs will you give? Round to the nearest whole number.
5mg x2 mLs = 1 mL
10 mg

2. MD orders furosemide (Lasix) 20 mg IV push x 1 dose now. On hand is furosemide 40 mg/4 mLs. How
many mLs will you give? Round to the nearest whole number.
20 mg x 4 mLs = 2 mLs
40 mg

3. MD orders heparin 5000 units sq Q 12 bid. First dose now. On hand is heparin 10,000 units/mL. How
many mLs will you give? Record to one decimal place (tenth).
5000 u x 1 mL = 0.5 mLs
10,000 u
4. MD orders morphine 2.5 mg IV push STAT. On hand is morphine 10 mg/mL. How many mLs will you
give? Record to two decimal places (hundredth).
2.5 mg x 1 mL = 0.25 mLs
10 mg
5. MD orders levothyroxine (Synthroid) 25 mcg po daily. On hand is a scored levothyroxine 0.05 mg
tablet. How many tabs will you give?
0.05 mg x 1000 = 50 mcg/tablets 25 mcg x 1 tab = 0.5 tab
50 mcg

6. MD orders ibuprofen 600 mg po now. On hand is ibuprofen 200 mg/tablet. How many tabs will you
give?
600 mg = 3 tabs
200 mg

7. MD orders 650 mg of iron (ferrous sulfate) po now. On hand is iron 325 mg/tablet. How many tabs
will you give?
650 mg = 2 tabs
325 mg

8. MD orders 0.200 mg of levothyroxine po daily. On hand is levothyroxine 100 mcg/tablet. How many
tabs will you give? 0.2 mg x 1000 = 200 mcg dose ordered.
200 mcg = 2 tabs
100 mcg

9. MD orders 1000 mLs of 0.9% NaCl to be given over 8 hours. How many mL/hr will you set the IV
infusion pump? Round to the nearest whole number.
1000 mLs = 125 mLs/hr
8 hrs

, 10. MD orders 1000 mLs of D5W to be given over 5 hours. How many mL/hr will you set the IV infusion
pump? Record to the nearest whole number.
1000 mLs = 200 mLs/hr
5 hrs

11. MD orders Vancomycin 500 mg in 150 mLs of D5W to be given over 90 minutes. What is your mL/hr?
Round to the nearest whole number. 90 min = 1.5 hours
150 mLs = 100 mLs/hr
1.5 hrs

12. MD orders ceftriaxone (Rocephin) 1 gram in 100 mLs of 0.9% NS to be given over 60 minutes. What is
your mL/hr? Record to the nearest whole number. 60 min = 1 hour
100 mLs = 100 mLs/hr
1 hr

13. MD orders cefazolin (Ancef) 1 gram in 50 mLs of 0.9% NS to be given over 30 minutes. What is your
mL/hr? Record to the nearest whole number. 30 min = 0.5 hr
50 mLs = 100 mLs/hr
0.5 hrs

14. You are ordered to give 1000 mLs of 0.45% NaCl over 5 hours to your patient. The drop factor is 15
gtts/mL. What is the gtts/min? Round to the nearest whole number.
1000 mLs x 15 gtts/mL = 15000 gtts = 50 gtts/min
5 hours x 60 min/hr 300 min

15. You are ordered to give 250 mLs of 0.9% NS over 2 hours to your patient. The drop factor is 20
gtts/mL. What is the gtts/min? Round to the nearest whole number.
250 mLs x 20 gtts/mL = 5000 gtts = 41.6 = 42 gtts/min
2 hrs x 60 min/hr 120 min
16. You have an order for 500 mL of Lactated Ringers (LR) to be infused at 75 mLs/hr. The drop factor is
15. What is the gtts/min? Round to the nearest whole number.
75 mLs x 15 gtts/mL = 1125 gtts = 18.75 = 19 gtts/min
60 min 60 min

17. You have an order for 1 L of D5W to be infused at 50 mL/hr. The drop factor is 20. What is the
gtts/min? Round to the nearest whole number.
50 mLs x 20 gtts/mL = 1000 gtts = 16.6 = 17 gtts/min
60 min 60 min