ATI Dosage Calculation – Critical Care TEST
STUDY GUIDE 2025/2026 | 5 BUNDLED
VERSIONS WITH VERIFIED QUESTIONS
AND 100% CORRECT ANSWERS | LATEST
UPDATED VERSION
IV Flow Rates (mL/hr, gtt/min)
1. The provider orders 1,000 mL of 0.9% NS to infuse over 8 hours.
The IV tubing has a drop factor of 15 gtt/mL. What is the correct
rate in gtt/min?
a) 21 gtt/min
b) 31 gtt/min
c) 42 gtt/min
d) 125 gtt/min
b) 31 gtt/min *(Calculation: (1,000 mL / 480 min) x 15 gtt/mL =
31.25 ≈ 31 gtt/min)*
2. A patient is to receive 250 mL of packed red blood cells over 4
hours. The blood administration set has a drop factor of 10 gtt/mL.
What is the flow rate in gtt/min?
a) 10 gtt/min
b) 15 gtt/min
c) 17 gtt/min
d) 21 gtt/min
a) 10 gtt/min *(Calculation: (250 mL / 240 min) x 10 gtt/mL = 10.4
≈ 10 gtt/min)*
,3. An IV of 500 mL D5W is infusing at 80 mL/hr. How long will this
IV bag last?
a) 4 hours and 15 minutes
b) 5 hours and 30 minutes
c) 6 hours and 15 minutes
d) 7 hours and 30 minutes
c) 6 hours and 15 minutes *(Calculation: 500 mL / 80 mL/hr =
6.25 hours = 6 hrs 15 min)*
4. The provider orders ampicillin 1 g in 100 mL 0.9% NS to infuse
over 45 minutes. What is the rate in mL/hr?
a) 75 mL/hr
b) 100 mL/hr
c) 133 mL/hr
d) 150 mL/hr
c) 133 mL/hr *(Calculation: (100 mL / 45 min) x 60 min/hr = 133.3
≈ 133 mL/hr)*
5. A medication is ordered to infuse at 125 mL/hr via an infusion
pump. How much fluid will the patient receive in 6 hours?
a) 650 mL
b) 700 mL
c) 750 mL
d) 800 mL
c) 750 mL *(Calculation: 125 mL/hr x 6 hr = 750 mL)*
IV Medications (mcg/min, mcg/kg/min, units/hr)
6. The provider orders a lidocaine infusion at 2 mg/min. The
concentration is 2 g in 500 mL D5W. What is the pump setting in
mL/hr?
, a) 15 mL/hr
b) 30 mL/hr
c) 60 mL/hr
d) 120 mL/hr
b) 30 mL/hr *(Calculation: 2 g = 2000 mg. Concentration: 2000 mg
/ 500 mL = 4 mg/mL. Dose needed: 2 mg/min -> 120 mg/hr. Rate: 120
mg/hr ÷ 4 mg/mL = 30 mL/hr)*
7. A patient weighing 70 kg is to receive dobutamine at 5
mcg/kg/min. The IV bag has 500 mg in 250 mL D5W. What is the
infusion rate in mL/hr?
a) 5.25 mL/hr
b) 10.5 mL/hr
c) 15.75 mL/hr
d) 21 mL/hr
b) 10.5 mL/hr *(Calculation: Dose needed: 5 mcg/kg/min x 70 kg =
350 mcg/min -> 21,000 mcg/hr = 21 mg/hr. Concentration: 500 mg / 250
mL = 2 mg/mL. Rate: 21 mg/hr ÷ 2 mg/mL = 10.5 mL/hr)*
8. The provider orders heparin 25,000 units in 500 mL 0.9% NS to
infuse at 1,200 units/hr. What is the rate in mL/hr?
a) 12 mL/hr
b) 18 mL/hr
c) 24 mL/hr
d) 30 mL/hr
c) 24 mL/hr *(Calculation: Concentration: 25,000 units / 500 mL =
50 units/mL. Rate: 1,200 units/hr ÷ 50 units/mL = 24 mL/hr)*
9. A nitroglycerin drip is infusing at 8 mL/hr. The concentration is
50 mg in 250 mL D5W. What is the dosage the patient is receiving in
mcg/min?
STUDY GUIDE 2025/2026 | 5 BUNDLED
VERSIONS WITH VERIFIED QUESTIONS
AND 100% CORRECT ANSWERS | LATEST
UPDATED VERSION
IV Flow Rates (mL/hr, gtt/min)
1. The provider orders 1,000 mL of 0.9% NS to infuse over 8 hours.
The IV tubing has a drop factor of 15 gtt/mL. What is the correct
rate in gtt/min?
a) 21 gtt/min
b) 31 gtt/min
c) 42 gtt/min
d) 125 gtt/min
b) 31 gtt/min *(Calculation: (1,000 mL / 480 min) x 15 gtt/mL =
31.25 ≈ 31 gtt/min)*
2. A patient is to receive 250 mL of packed red blood cells over 4
hours. The blood administration set has a drop factor of 10 gtt/mL.
What is the flow rate in gtt/min?
a) 10 gtt/min
b) 15 gtt/min
c) 17 gtt/min
d) 21 gtt/min
a) 10 gtt/min *(Calculation: (250 mL / 240 min) x 10 gtt/mL = 10.4
≈ 10 gtt/min)*
,3. An IV of 500 mL D5W is infusing at 80 mL/hr. How long will this
IV bag last?
a) 4 hours and 15 minutes
b) 5 hours and 30 minutes
c) 6 hours and 15 minutes
d) 7 hours and 30 minutes
c) 6 hours and 15 minutes *(Calculation: 500 mL / 80 mL/hr =
6.25 hours = 6 hrs 15 min)*
4. The provider orders ampicillin 1 g in 100 mL 0.9% NS to infuse
over 45 minutes. What is the rate in mL/hr?
a) 75 mL/hr
b) 100 mL/hr
c) 133 mL/hr
d) 150 mL/hr
c) 133 mL/hr *(Calculation: (100 mL / 45 min) x 60 min/hr = 133.3
≈ 133 mL/hr)*
5. A medication is ordered to infuse at 125 mL/hr via an infusion
pump. How much fluid will the patient receive in 6 hours?
a) 650 mL
b) 700 mL
c) 750 mL
d) 800 mL
c) 750 mL *(Calculation: 125 mL/hr x 6 hr = 750 mL)*
IV Medications (mcg/min, mcg/kg/min, units/hr)
6. The provider orders a lidocaine infusion at 2 mg/min. The
concentration is 2 g in 500 mL D5W. What is the pump setting in
mL/hr?
, a) 15 mL/hr
b) 30 mL/hr
c) 60 mL/hr
d) 120 mL/hr
b) 30 mL/hr *(Calculation: 2 g = 2000 mg. Concentration: 2000 mg
/ 500 mL = 4 mg/mL. Dose needed: 2 mg/min -> 120 mg/hr. Rate: 120
mg/hr ÷ 4 mg/mL = 30 mL/hr)*
7. A patient weighing 70 kg is to receive dobutamine at 5
mcg/kg/min. The IV bag has 500 mg in 250 mL D5W. What is the
infusion rate in mL/hr?
a) 5.25 mL/hr
b) 10.5 mL/hr
c) 15.75 mL/hr
d) 21 mL/hr
b) 10.5 mL/hr *(Calculation: Dose needed: 5 mcg/kg/min x 70 kg =
350 mcg/min -> 21,000 mcg/hr = 21 mg/hr. Concentration: 500 mg / 250
mL = 2 mg/mL. Rate: 21 mg/hr ÷ 2 mg/mL = 10.5 mL/hr)*
8. The provider orders heparin 25,000 units in 500 mL 0.9% NS to
infuse at 1,200 units/hr. What is the rate in mL/hr?
a) 12 mL/hr
b) 18 mL/hr
c) 24 mL/hr
d) 30 mL/hr
c) 24 mL/hr *(Calculation: Concentration: 25,000 units / 500 mL =
50 units/mL. Rate: 1,200 units/hr ÷ 50 units/mL = 24 mL/hr)*
9. A nitroglycerin drip is infusing at 8 mL/hr. The concentration is
50 mg in 250 mL D5W. What is the dosage the patient is receiving in
mcg/min?
