ATI Dosage Calculation RN Adult Medical Surgical Proctored Assessment 3.1 ( 31 Questions)
A nurse is preparing to administer ampicillin 500 mg IM every 6 hr. The available ampicillin is in a 500 mg vial.
The package insert instructs to add 1.8 mL of sterile water to yield ampicillin 250 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number.
Use a leading zero if it applies. Do not use a trailing zero.)
Correct Answer: 2
Step 1: The available ampicillin is in a 500 mg vial. The package insert instructs to add 1.8 mL of sterile water to yield ampicillin 250 mg/mL.
Step 2: We need to administer 500 mg of ampicillin. Step 3: The concentration of the solution is 250 mg/mL.
Step 4: To find out how many mL should the nurse administer per dose, we divide the required dose by the concentration.
Step 5: So, 500 mg ÷ 250 mg/mL = 2 mL. The nurse should administer 2 mL per dose.
Practice Test
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31