Question

1. Humulin R 20U SQ a.c. is prescribed for a patient. You have only a tuberculin syringe (graduated in mL) and a bottle of Humulin R labeled 100 U/mL. How many mL will you inject into the patient before his meal?

2. Enoxaparin 40 mg SQ daily is ordered for a post-operative patient. You have only a pre-filled syringe labeled 40 mg / 0.4 mL. How many mL will you inject?

3. Morphine 5 mg SQ q 4h PRN pain is ordered for a paitient. You have only only a bottle marked Morphine 50 mg/mL. How many mL will you inject every 4 hours if the patient is complaining of pain?

4. Adrenalin (epinephrine) 0.5 mg SQ is ordered for a patient with a severe asthma. You have only a bottle labeled Adrenalin 1:1,000 (1 mg/mL). How many mL will you inject?

Answer 1

Ans) Order: Humulin R 20U SQ

Available: Humulin R labeled 100 U/mL.

100 U = 1 ml

20 U = x

x = 20 ÷ 100 = 0.2 ml

0.2 ml is to be injected for the dose.

2) Order: Enoxaparin 40 mg SQ daily

Available:  Pre-filled syringe labeled 40 mg / 0.4 mL

Pre-filled syringe labeled 40 mg / 0.4 mL & dose to be given is also 40 mg so 0.4 ml is to be injected.

3) Order: Morphine 5 mg SQ q 4h

Available:  Morphine 50 mg/mL.

50 mg = 1 ml

5 mg = x

x = 5/50 = 0.1 ml

0.1 ml is to be injected for the dose.

4) Order: Adrenalin (epinephrine) 0.5 mg SQ

Available:  Adrenalin 1:1,000 (1 mg/mL)

1 mg = 1 ml

0.5 mg = x

x = 0.5/1 = 0.5 ml

0.5 ml is to be injected for the dose.