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Nursing Math + IV Flow Rate
Calculations
Questions 1–180 | Comprehensive Dosage & IV Calculation Practice | 100% Pass Guaranteed |
Graded A+
1. A nurse is preparing to administer 1,000 mL of 0.9% normal saline over 8 hours. The IV
tubing has a drop factor of 15 gtt/mL. What is the flow rate in drops per minute?
A. 21 gtt/min
B. 31 gtt/min
C. 41 gtt/min
D. 51 gtt/min
Correct answer: B
Explanation: Using the formula: (Volume × Drop factor) ÷ Time in minutes = (1,000 mL × 15
gtt/mL) ÷ (8 hours × 60 minutes) = 15,000 ÷ 480 = 31.25, rounded to 31 gtt/min. Option A (21
gtt/min) is too low. Option C (41 gtt/min) is too high. Option D (51 gtt/min) is too high.
2. A provider orders 500 mL of lactated Ringer's to infuse over 4 hours. The drop factor is
20 gtt/mL. What is the flow rate in drops per minute?
A. 32 gtt/min
B. 42 gtt/min
C. 52 gtt/min
D. 62 gtt/min
Correct answer: B
Explanation: (500 mL × 20 gtt/mL) ÷ (4 hours × 60 minutes) = 10,000 ÷ 240 = 41.67, rounded
to 42 gtt/min. Option A (32 gtt/min) is too low. Option C (52 gtt/min) is too high. Option D (62
gtt/min) is too high.
3. A nurse is calculating the flow rate for an IV infusion of 1,200 mL over 10 hours using a
pump. What is the flow rate in mL/hour?
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A. 100 mL/hour
B. 120 mL/hour
C. 140 mL/hour
D. 160 mL/hour
Correct answer: B
Explanation: For an IV pump, the flow rate is calculated as Volume ÷ Time = 1,200 mL ÷ 10
hours = 120 mL/hour. Option A (100 mL/hour) would infuse 1,000 mL. Option C (140 mL/hour)
would infuse 1,400 mL. Option D (160 mL/hour) would infuse 1,600 mL.
4. A medication order reads: Infuse 750 mL of D5W over 6 hours. The drop factor is 10
gtt/mL. What is the flow rate in drops per minute?
A. 15 gtt/min
B. 21 gtt/min
C. 25 gtt/min
D. 31 gtt/min
Correct answer: B
Explanation: (750 mL × 10 gtt/mL) ÷ (6 hours × 60 minutes) = 7,500 ÷ 360 = 20.83, rounded
to 21 gtt/min. Option A (15 gtt/min) is too low. Option C (25 gtt/min) is too high. Option D (31
gtt/min) is too high.
5. A nurse is preparing to administer 1,500 mL of IV fluid over 12 hours. The
administration set delivers 15 gtt/mL. What is the flow rate in drops per minute?
A. 21 gtt/min
B. 31 gtt/min
C. 41 gtt/min
D. 51 gtt/min
Correct answer: B
Explanation: (1,500 mL × 15 gtt/mL) ÷ (12 hours × 60 minutes) = 22,500 ÷ 720 = 31.25,
rounded to 31 gtt/min. Option A (21 gtt/min) is too low. Option C (41 gtt/min) is too high.
Option D (51 gtt/min) is too high.
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6. A patient is prescribed 1,000 mL of IV fluid to infuse over 6 hours. The drop factor is 60
gtt/mL (microdrip). What is the flow rate in drops per minute?
A. 100 gtt/min
B. 125 gtt/min
C. 167 gtt/min
D. 200 gtt/min
Correct answer: C
Explanation: For a microdrip (60 gtt/mL), the flow rate in gtt/min equals the flow rate in
mL/hour. First, calculate mL/hour: 1,000 mL ÷ 6 hours = 166.7 mL/hour. Since the drop factor
is 60 gtt/mL, the flow rate is 166.7 gtt/min, rounded to 167 gtt/min. Option A (100 gtt/min) is
too low. Option B (125 gtt/min) is too low. Option D (200 gtt/min) is too high.
7. A nurse is administering 2,000 mL of IV fluid over 24 hours using a pump. What is the
flow rate in mL/hour?
A. 63 mL/hour
B. 73 mL/hour
C. 83 mL/hour
D. 93 mL/hour
Correct answer: C
Explanation: 2,000 mL ÷ 24 hours = 83.3 mL/hour, rounded to 83 mL/hour. Option A (63
mL/hour) would infuse 1,512 mL. Option B (73 mL/hour) would infuse 1,752 mL. Option D (93
mL/hour) would infuse 2,232 mL.
8. A provider orders 500 mL of IV fluid to infuse over 3 hours. The drop factor is 15
gtt/mL. What is the flow rate in drops per minute?
A. 31 gtt/min
B. 42 gtt/min
C. 52 gtt/min
D. 62 gtt/min
Correct answer: B
Explanation: (500 mL × 15 gtt/mL) ÷ (3 hours × 60 minutes) = 7,500 ÷ 180 = 41.67, rounded
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to 42 gtt/min. Option A (31 gtt/min) is too low. Option C (52 gtt/min) is too high. Option D (62
gtt/min) is too high.
9. A nurse is calculating the drip rate for 250 mL of antibiotic solution to infuse over 90
minutes. The drop factor is 20 gtt/mL. What is the flow rate in drops per minute?
A. 46 gtt/min
B. 56 gtt/min
C. 66 gtt/min
D. 76 gtt/min
Correct answer: B
Explanation: (250 mL × 20 gtt/mL) ÷ 90 minutes = 5,000 ÷ 90 = 55.56, rounded to 56 gtt/min.
Option A (46 gtt/min) is too low. Option C (66 gtt/min) is too high. Option D (76 gtt/min) is too
high.
10. A patient is to receive 1,000 mL of IV fluid over 5 hours. The drop factor is 10 gtt/mL.
What is the flow rate in drops per minute?
A. 23 gtt/min
B. 33 gtt/min
C. 43 gtt/min
D. 53 gtt/min
Correct answer: B
Explanation: (1,000 mL × 10 gtt/mL) ÷ (5 hours × 60 minutes) = 10,000 ÷ 300 = 33.33,
rounded to 33 gtt/min. Option A (23 gtt/min) is too low. Option C (43 gtt/min) is too high.
Option D (53 gtt/min) is too high.
11. A nurse is preparing to administer 1,800 mL of IV fluid over 18 hours. The drop factor is
20 gtt/mL. What is the flow rate in drops per minute?
A. 23 gtt/min
B. 33 gtt/min
C. 43 gtt/min
D. 53 gtt/min
Nursing Math + IV Flow Rate
Calculations
Questions 1–180 | Comprehensive Dosage & IV Calculation Practice | 100% Pass Guaranteed |
Graded A+
1. A nurse is preparing to administer 1,000 mL of 0.9% normal saline over 8 hours. The IV
tubing has a drop factor of 15 gtt/mL. What is the flow rate in drops per minute?
A. 21 gtt/min
B. 31 gtt/min
C. 41 gtt/min
D. 51 gtt/min
Correct answer: B
Explanation: Using the formula: (Volume × Drop factor) ÷ Time in minutes = (1,000 mL × 15
gtt/mL) ÷ (8 hours × 60 minutes) = 15,000 ÷ 480 = 31.25, rounded to 31 gtt/min. Option A (21
gtt/min) is too low. Option C (41 gtt/min) is too high. Option D (51 gtt/min) is too high.
2. A provider orders 500 mL of lactated Ringer's to infuse over 4 hours. The drop factor is
20 gtt/mL. What is the flow rate in drops per minute?
A. 32 gtt/min
B. 42 gtt/min
C. 52 gtt/min
D. 62 gtt/min
Correct answer: B
Explanation: (500 mL × 20 gtt/mL) ÷ (4 hours × 60 minutes) = 10,000 ÷ 240 = 41.67, rounded
to 42 gtt/min. Option A (32 gtt/min) is too low. Option C (52 gtt/min) is too high. Option D (62
gtt/min) is too high.
3. A nurse is calculating the flow rate for an IV infusion of 1,200 mL over 10 hours using a
pump. What is the flow rate in mL/hour?
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A. 100 mL/hour
B. 120 mL/hour
C. 140 mL/hour
D. 160 mL/hour
Correct answer: B
Explanation: For an IV pump, the flow rate is calculated as Volume ÷ Time = 1,200 mL ÷ 10
hours = 120 mL/hour. Option A (100 mL/hour) would infuse 1,000 mL. Option C (140 mL/hour)
would infuse 1,400 mL. Option D (160 mL/hour) would infuse 1,600 mL.
4. A medication order reads: Infuse 750 mL of D5W over 6 hours. The drop factor is 10
gtt/mL. What is the flow rate in drops per minute?
A. 15 gtt/min
B. 21 gtt/min
C. 25 gtt/min
D. 31 gtt/min
Correct answer: B
Explanation: (750 mL × 10 gtt/mL) ÷ (6 hours × 60 minutes) = 7,500 ÷ 360 = 20.83, rounded
to 21 gtt/min. Option A (15 gtt/min) is too low. Option C (25 gtt/min) is too high. Option D (31
gtt/min) is too high.
5. A nurse is preparing to administer 1,500 mL of IV fluid over 12 hours. The
administration set delivers 15 gtt/mL. What is the flow rate in drops per minute?
A. 21 gtt/min
B. 31 gtt/min
C. 41 gtt/min
D. 51 gtt/min
Correct answer: B
Explanation: (1,500 mL × 15 gtt/mL) ÷ (12 hours × 60 minutes) = 22,500 ÷ 720 = 31.25,
rounded to 31 gtt/min. Option A (21 gtt/min) is too low. Option C (41 gtt/min) is too high.
Option D (51 gtt/min) is too high.
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6. A patient is prescribed 1,000 mL of IV fluid to infuse over 6 hours. The drop factor is 60
gtt/mL (microdrip). What is the flow rate in drops per minute?
A. 100 gtt/min
B. 125 gtt/min
C. 167 gtt/min
D. 200 gtt/min
Correct answer: C
Explanation: For a microdrip (60 gtt/mL), the flow rate in gtt/min equals the flow rate in
mL/hour. First, calculate mL/hour: 1,000 mL ÷ 6 hours = 166.7 mL/hour. Since the drop factor
is 60 gtt/mL, the flow rate is 166.7 gtt/min, rounded to 167 gtt/min. Option A (100 gtt/min) is
too low. Option B (125 gtt/min) is too low. Option D (200 gtt/min) is too high.
7. A nurse is administering 2,000 mL of IV fluid over 24 hours using a pump. What is the
flow rate in mL/hour?
A. 63 mL/hour
B. 73 mL/hour
C. 83 mL/hour
D. 93 mL/hour
Correct answer: C
Explanation: 2,000 mL ÷ 24 hours = 83.3 mL/hour, rounded to 83 mL/hour. Option A (63
mL/hour) would infuse 1,512 mL. Option B (73 mL/hour) would infuse 1,752 mL. Option D (93
mL/hour) would infuse 2,232 mL.
8. A provider orders 500 mL of IV fluid to infuse over 3 hours. The drop factor is 15
gtt/mL. What is the flow rate in drops per minute?
A. 31 gtt/min
B. 42 gtt/min
C. 52 gtt/min
D. 62 gtt/min
Correct answer: B
Explanation: (500 mL × 15 gtt/mL) ÷ (3 hours × 60 minutes) = 7,500 ÷ 180 = 41.67, rounded
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to 42 gtt/min. Option A (31 gtt/min) is too low. Option C (52 gtt/min) is too high. Option D (62
gtt/min) is too high.
9. A nurse is calculating the drip rate for 250 mL of antibiotic solution to infuse over 90
minutes. The drop factor is 20 gtt/mL. What is the flow rate in drops per minute?
A. 46 gtt/min
B. 56 gtt/min
C. 66 gtt/min
D. 76 gtt/min
Correct answer: B
Explanation: (250 mL × 20 gtt/mL) ÷ 90 minutes = 5,000 ÷ 90 = 55.56, rounded to 56 gtt/min.
Option A (46 gtt/min) is too low. Option C (66 gtt/min) is too high. Option D (76 gtt/min) is too
high.
10. A patient is to receive 1,000 mL of IV fluid over 5 hours. The drop factor is 10 gtt/mL.
What is the flow rate in drops per minute?
A. 23 gtt/min
B. 33 gtt/min
C. 43 gtt/min
D. 53 gtt/min
Correct answer: B
Explanation: (1,000 mL × 10 gtt/mL) ÷ (5 hours × 60 minutes) = 10,000 ÷ 300 = 33.33,
rounded to 33 gtt/min. Option A (23 gtt/min) is too low. Option C (43 gtt/min) is too high.
Option D (53 gtt/min) is too high.
11. A nurse is preparing to administer 1,800 mL of IV fluid over 18 hours. The drop factor is
20 gtt/mL. What is the flow rate in drops per minute?
A. 23 gtt/min
B. 33 gtt/min
C. 43 gtt/min
D. 53 gtt/min
