IV Therapy Certification Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q1A physician orders 500 mL of lactated Ringer's solution to infuse over 4 hours. What is the correct infusion rate in mL/hr?
✓ Correct answer: D. 125 mL/hr
To calculate mL/hr, divide the total volume by the time in hours: 500 mL divided by 4 hours = 125 mL/hr.
Q2An order reads: Infuse 1500 mL D5W over 12 hours using tubing with a drop factor of 10 gtt/mL. What is the correct drip rate in drops per minute?
✓ Correct answer: C. 21 gtt/min
Using the formula (Volume × Drop factor) divided by Time in minutes: (1500 × 10) divided by 720 minutes = 15000 divided by 720 = 20.8, which rounds to 21 gtt/min.
Q3A patient weighing 70 kg requires dopamine at 5 mcg/kg/min. The solution concentration is 400 mg in 250 mL. What infusion rate in mL/hr should be set?
✓ Correct answer: B. 13.1 mL/hr
First calculate the dose: 70 kg × 5 mcg/kg/min = 350 mcg/min. Convert to mg/min: 350 mcg divided by 1000 = 0.35 mg/min. Convert to mg/hr: 0.35 × 60 = 21 mg/hr. Calculate concentration: 400 mg in 250 mL = 1.6 mg/mL. Finally: 21 mg/hr divided by 1.6 mg/mL = 13.125 mL/hr, rounds to 13.1 mL/hr.
Q4A medication order specifies 250 mg in 100 mL to infuse over 30 minutes. What is the infusion rate in mL/hr?
✓ Correct answer: A. 200 mL/hr
To convert 30 minutes to an hourly rate: 100 mL in 30 minutes equals 100 mL divided by 0.5 hours = 200 mL/hr. Alternatively, 100 mL × 2 (since 30 min is half an hour) = 200 mL/hr.
Q5An IV is infusing at 125 mL/hr. Using tubing with a drop factor of 20 gtt/mL, what is the drip rate in drops per minute?
✓ Correct answer: D. 42 gtt/min
Convert mL/hr to mL/min first: 125 mL/hr divided by 60 min = 2.083 mL/min. Then multiply by drop factor: 2.083 × 20 = 41.66, which rounds to 42 gtt/min. Alternatively, use the formula: (mL/hr × Drop factor) divided by 60 = (125 × 20) divided by 60 = 41.66, rounds to 42 gtt/min.
Q6A vial contains 1 gram of medication powder. The reconstitution instructions state to add 9.6 mL of sterile water to yield 10 mL of solution. What is the final concentration in mg/mL?
✓ Correct answer: C. 100 mg/mL
Convert 1 gram to milligrams: 1 g = 1000 mg. The final volume is 10 mL. Concentration = 1000 mg divided by 10 mL = 100 mg/mL.
Q7A patient weighing 55 kg needs a loading dose of a medication at 15 mg/kg. How many milligrams should be administered?
✓ Correct answer: B. 825 mg
Multiply the patient's weight by the dose per kilogram: 55 kg × 15 mg/kg = 825 mg.
Q8An infusion of 1000 mL is running at 75 mL/hr. How many hours will it take for the infusion to complete?
✓ Correct answer: A. 13.3 hours
Divide the total volume by the infusion rate: 1000 mL divided by 75 mL/hr = 13.33 hours, which is approximately 13 hours and 20 minutes.
Q9A physician orders 2000 mL of 0.45 percent sodium chloride to infuse over 24 hours using microdrip tubing (60 gtt/mL). What is the drip rate in drops per minute?
✓ Correct answer: D. 83 gtt/min
Using the formula (Volume × Drop factor) divided by Time in minutes: (2000 × 60) divided by 1440 minutes = 120000 divided by 1440 = 83.33, which rounds to 83 gtt/min. With microdrip (60 gtt/mL), the drip rate equals the mL/hr rate numerically: 2000 divided by 24 = 83.33 mL/hr = 83 gtt/min.
Q10A medication label states 50 mg/2 mL. The order is for 35 mg. How many milliliters should be drawn up?
✓ Correct answer: C. 1.4 mL
Set up a proportion: 50 mg / 2 mL = 35 mg / X mL. Cross multiply: 50X = 70. Solve for X: X = 70 divided by 50 = 1.4 mL.
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