Dosage Calculation

CHAPTER 12-DIMENSIONAL ANALYSIS/UNITS CONVERSION 109

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Chapter 12: Dimensional Analysis/Units Conversion

Additional Practice Problems

Calculate the following dosages using dimensional analysis. Refer to labels for the available dose and indicate the dose needed on the syringe provided. Express answers to nearest tenth.

Dosage Ordered mL Needed

1. diazepam 2.5 mg _____________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

110 SECTION 4 DOSAGE CALCULATIONS

Dosage Ordered mL Needed

 

3. Dilantin 0.2 g _____________

 

 

 

 

 

 

 

 

 

 

 

 

4. Depo-Provera 1 g _____________

 

 

 

 

 

 

 

CHAPTER 12-DIMENSIONAL ANALYSIS/UNITS CONVERSION 111

 

 

6. Robinul 200 mcg _____________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dosage Ordered mL Needed

7. potassium chloride 12 mEq _____________

 

 

 

 

8.

 

 

 

 

 

 

heparin 150 units

_____________

 

 

 

 

 

 

 

 

 

 

112 SECTION 4 DOSAGE CALCULATIONS

 

9. meperidine 50 mg _____________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10. Penicillin 1,000,000 units is ordered. The label on the available penicillin vial reads:

500,000 units/mL.

mL needed ______________

11. Digoxin 125 mcg is ordered. The label on the available digoxin vial reads: digoxin

0.25 mg/mL.

mL needed _______________

12. Acetaminophen elixir 325 mg is ordered. Label on available bottle of acetaminophen reads: acetaminophen 650 mg/10 mL.

mL needed ______________

13. Solumedrol 80 mg is ordered. Label on available solumedrol vial reads: solumedrol 125 mg/2 mL. mL needed ______________

14. Diazepam 5 mg is ordered. Label on available diazepam vial reads: diazepam 2.5 mg/mL. mL needed _______________

15. Droperidol 2 mg is ordered. Label on available droperidol vial reads: droperidol 5 mg/ 2 mL.

mL needed ________________

 

 

REMEDIATION PACKET PART B: DOSAGE CALCULATIONS

1. A 280 pound man weighs how many kg?

 

 

2. Order: Lasix (furosemide) 40mg PO daily

Available: tablets labeled 20mg

How many tablets will the nurse administer?

 

 

3. Administer D5LR at 75ml/hr. The drop factor is 10gtt/ml

Calculate the flow rate in gtt/min

 

 

4. Administer 1000ml D5W in 6hr. The drop factor is 15gtt/ml.

Calculate the flow rate in gtt/min.

 

 

5. Infuse 200ml of NSS in 2hr. The drop factor is 20gtt/ml.

Calculate the flow rate in gtt/min.

 

 

6. Order: Gentamicin (garamycin) 55mg IM q8hr.

Available: Gentamicin (garamycin) 80mg per 2ml.

a. How many ml will the nurse administer for one dose?

b. How many ml will the nurse administer for the day?

 

 

 

 

7. Ampicillin 750mg IV q4hr.

Available: 2000mg per 5ml.

How many ml will the nurse administer for one dose?

How many ml will the nurse administer for one day?

 

 

 

 

8. An IV of 500ml NSS is to infuse at 60ml/hr. How long will the infusion take?

If the IV was started at 2000 (chronological time, military time), when would the infusion be completed (state in chronological time; military time)?

 

 

 

 

 

9. Order: Gentamicin (garamycin) 50mg IVPB q8h for a child weighing 40lb.

The recommended dosage for a child is 6 to 7.5mg/kg/day divided q8h.

Is the dosage ordered safe?

 

 

 

 

 

 

10. Order: Phenobarbital 10mg PO q12h is ordered for a child weighing 9 pounds.

The recommended maintenance dose is 3 to 5mg/kg/day q 12h.

Is the dosage ordered safe?

 

 

 

 

11. Provider’s Order: Tylenol supp 1 g pr q 6 hr prn temp > 101; Available: Tylenol supp 325 mg (scored). How many supp will you administer?

 

A. 2 supp

B. 1 supp

C. 3 supp

D. 5 supp

 

12. Provider’s Order: Nafcillin 500 mg po pc; Available: Nafcillin 1 gm tab (scored). How many tab will you administer per day?

 

A. 2.5 tabs

B. 2 tabs

C. 1.5 tabs

D. 1 tab

 

13. Provider’s Order: Synthroid 75 mcg po daily; Available: Synthroid 0.15 mg tab (scored). How many tab will you administer?

 

A. 1 tab

B. 0.5 tab

C. 2 tabs

D. 1.5 tabs

 

14. Provider’s Order: Diuril 1.8 mg/kg po tid; Available: Diuril 12.5 mg caps. How many cap will you administer for each dose to a 31 lb child?

 

A. 2 caps

B. 2.5 caps

C. 3 caps

D. 1.5 caps

 

15. Provider’s Order: Cleocin Oral Susp 600 mg po qid; Directions for mixing: Add 100 mL of water and shake vigorously. Each 2.5 mL will contain 100 mg of Cleocin. How many tsp of Cleocin will you administer?

 

A. 3 tsp

B. 5 tsp

C. 3.5 tsp

D. 1 tsp

 

16. Provider’s Order: Sulfasalazine Oral Susp 500 mg q 6 hr; Directions for mixing: Add 125 mL of water and shake well. Each tbsp will yield 1.5 g of Sulfasalazine. How many mL will you give?

 

A. 5 ml

B. 3 ml

C. 4 ml

D. 2 ml

 

17. Your patient has had the following intake: 2 ½ cups of coffee (240 mL/cup), 11.5 oz of grape juice, ¾ qt of milk, 320 mL of diet coke, 1 ¼ L of D5W IV and 2 oz of grits. What will you record as the total intake in mL for this patient?

 

A. 2,325 ml

B. 3,265 ml

C. 3,325 ml

D. 2,235 ml

 

18. Your patient has had the following intake: 8 oz glasses of iced tea, 4 oz cartons of grape juice, ¾ pt of ice cream, 32 oz of juice, 1 ½ L of D5W IV and 6 oz of cottage cheese. What will you record as the total intake in mL for this patient?

 

A. 3,357 ml

B. 3,375 ml

C. 3,915 ml

D. 3,195 ml

 

19. Provider’s Order: Kantamycin 7.5 mg/kg IM q 12 hr; Available: Kantamycin 0.35 Gm/mL. How many mL will you administer for each dose to a 157 lb patient?

 

A. 2 ml

B. 1 ml

C. 2.5 ml

D. 1.5 ml

 

 

 

 

 

20. Provider’s Order: Heparin 7,855 units Sub Q bid; Available: Heparin 10,000 units per ml. How many mL will you administer?

 

A. 0.79 ml

B. 1.79 ml

C. 0.17 ml

D. 1.17 ml

 

21. Provider’s Order: Demerol 50 mg IVP q 6 hr prn pain; Available: Demerol 75 mg/ 1.3mL. How many mL will you administer?

 

A. 0.87 ml

B. 1.87 ml

C. 2 ml

D. 2.87 ml

 

22. Provider’s Order: Streptomycin 1.75 mg/ lb IM q 12 hr; Available: Streptomycin 0.35 g / 2.3 mL. How many mL will you administer a day to a 59 Kg patient?

 

A. 1.5 ml

B. 2 ml

C. 2.5 ml

D. 3 ml

 

23. Provider’s Order: Bumex 0.8 mg IV bolus bid; Reconstitution instructions: Constitute to 1000 micrograms/3.1 mL with 4.8mL of 5% Dextrose Water for Injection. How many mL will you administer?

 

A. 2 ml

B. 3.5 ml

C. 3 ml

D. 2.5 ml

 

24. Provider’s Order: Tazidime 0.3 g IM tid; Reconstitution instructions: For IM solution add 1.5 mL of diluent. Shake to dissolve. Provides an approximate volume of 1.8 mL (280 mg/mL). How many mL will you give?

 

A. 1.9 ml

B. 2 ml

C. 3 ml

D. 1.1 ml

 

 

 

 

 

 

25. Provider’s Order: Infuse 50 mg of Amphotericin B in 250 mL NS over 4 hr 15 min; Drop factor: 12gtt/mL. What flow rate (mL/hr) will you set on the IV infusion pump?

 

A. 11.8 ml/hr

B. 58.8 ml/hr

C. 14.1 ml/hr

D. 60.2 ml/hr

 

26. Provider’s Order: 1 ½ L of NS to be infused over 7 hours; Drop factor: 15 gtt/mL. What flow rate (mL/hr) will you set on the IV infusion pump?

 

A. 53.6 ml/hr

B. 214.3 ml/hr

C. 35.7 ml/hr

D. 142.9 ml/hr

 

27. Provider’s Order: Mandol 300 mg in 50 mL of D5W to infuse IVPB 15 minutes; Drop factor: 10 gtt/mL. How many mL/hr will you set on the IV infusion pump?

 

A. 200 ml/hr

B. 87.5 ml/hr

C. 3.3 ml/hr

D. 50 ml/hr

 

28. Provider’s Order: Infuse 1200 mL of 0.45% Normal Saline at 125 mL/hr; Drop Factor: 12gtt/min. How many gtt/min will you regulate the IV?

 

A. 2 gtt/min

B. 12 gtt/min

C. 25 gtt/min

D. 27 gtt/min

 

29. Provider’s Order: Rocephin 0.5 grams in 250 mL of D5W to infuse IVPB 45 minutes; Drop Factor: 12gtt/min. How many gtt/ min will you regulate the IVPB?

 

A. 6 gtt/min

B. 30 gtt/min

C. 67 gtt/min

D. 87 gtt/min

 

30. Provider’s Order: ¼ L of D5W to infuse over 2 hr 45 min; Drop factor: 60 gtt/mL. How many gtt/min will you regulate the IV?

 

A. 91 gtt/min

B. 96 gtt/min

C. 125 gtt/min

D. 142 gtt/min

 

 

© 2010 Cengage Learning. All Rights Reserved. Permission to reproduce granted for classroom use only.

© 2010 Cengage Learning. All Rights Reserved. Permission to reproduce granted for classroom use only.

© 2010 Cengage Learning. All Rights Reserved. Permission to reproduce granted for classroom use only.