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ATI Dosage Calculations (3)

RN - Nursing Exam(s) 14 Questions ✓ Free Access

Dosage Calculation

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Q1: A nurse is preparing to administer a 100 mcg stat dose of fentanyl IV for a client with severe pain. The amount available is 0.05 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

A. 2
Correct Answer: 2
Rationale:

✔ Step 1: Convert micrograms (mcg) to milligrams (mg)

100 mcg ÷ 1000 = 0.1 mg

✔ Step 2: Use the formula to calculate mL

Available: 0.05 mg/mL

mL = Dose ÷ Concentration

mL = 0.1 ÷ 0.05 = 2

✔ Step 3: Rounding

Already a whole number = 2 mL

Q2: A nurse is documenting the Intake & Output on one of his clients for the last 12 hours. The client reported that he had 5 ounces of juice, 6 ounces of coffee, and 12 ounces of water and half an ounce of liquid medication. The client had a urine output of 420 mL and 1 episode of diarrhea. What will the nurse enter on the client's total intake (mL)? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

A. 705
Correct Answer: 705
Rationale:

✔ Step 1: Convert ounces to milliliters

1 oz = 30 mL

  1. Juice: 5 oz × 30 = 150 mL
  2. Coffee: 6 oz × 30 = 180 mL
  3. Water: 12 oz × 30 = 360 mL
  4. Liquid medication: 0.5 oz × 30 = 15 mL

✔ Step 2: Add all intake volumes

Total intake = 150 + 180 + 360 + 15 = 705 mL

✔ Step 3: Rounding

Already a whole number = 705 mL

Q3: A nurse is preparing to administer lactulose 15 mL PO once daily. How many tablespoons should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

A. 1
Correct Answer: 1
Rationale:

✔ Step 1: Use the standard conversion factor

1 tablespoon (Tbsp) = 15 mL

✔ Step 2: Set up the formula

Tbsp = mL ÷ 15

Tbsp = 15 ÷ 15 = 1

✔ Step 3: Rounding

Already a whole number = 1 tablespoon

Q4: A nurse is preparing to administer 2.4 million units of penicillin G intramuscularly for a client who is both positive for HIV and syphilis. The prescriber ordered 2.4 million units 1M every week for three consecutive weeks. The available dose comes in a 600,000/mL vial. How many mL of medications would the client receive per dose?

Answer Choices:

A. 4
Correct Answer: 4
Rationale:

✔ Step 1: Identify the prescribed dose and available concentration

Prescribed dose = 2,400,000 units

Available = 600,000 units/mL

✔ Step 2: Use the formula to calculate mL

mL = Dose ÷ Concentration

mL = 2,400,000 ÷ 600,000 = 4

✔ Step 3: Rounding

Already a whole number = 4 mL

Q5: A nurse is preparing to administer tramadol 100 mg PO every 6 hours for a client prior to wound dressing change. The amount available is 50 mg/tablet. How many tablet(s) 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.)

Answer Choices:

A. 2
Correct Answer: 2
Rationale:

✔ Step 1: Identify the prescribed dose and tablet strength

Prescribed dose = 100 mg

Available = 50 mg per tablet

✔ Step 2: Use the formula to calculate tablets

Tablets = Dose ÷ Strength per tablet

Tablets = 100 ÷ 50 = 2

✔ Step 3: Rounding

Already a whole number = 2 tablets

Access All 14 Questions with Full Explanations

Exam Details
Total Questions: 14 practice questions
Category: RN - Nursing Exam(s)
Subcategory: ATI Exams
Domain: ATI DOSAGE CALCULATION
Last Updated: Dec 01, 2025
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