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IV Math Practice
1. The physician’s order reads, “Infuse 600 U of heparin every
hour.” The pharmacy prepares a solution of 250ml of D5W
containing 12,000 U of heparin. This solution will infuse how
many milliliters per hour? (pg 34)
A.
B.
C.
D.
12.5 ml/hour
30 ml/hour
50 ml hour
100 ml/hour
2. The physician’s order reads, “Add 50 mg of ranitidine to 100 ml
of D5W and infuse at 2.5 mg/minute.” If the drop factor is
10gtt=1ml, the nurse should set the flow rate at? (pg 51)
A.
B.
C.
D.
25
50
73
99
gtt/min
gtt/min
gtt/min
gtt/min
3. The nurse prepares to administer 1,500 mg of tetracycline that
has been added to 1,000 ml of 0.9 saline solution to infuse at
60mg/hr. If the drop factor is 20 gtt = 1 ml, the flow rate should
be set at? (pg 54)
A.
B.
C.
D.
7 gtt/min
9 gtt/min
10 gtt/min
13 gtt/min
4. The nurse prepares to administer 1,000 mg of the cephalosporin
cefotaxime (claforan), which has been added to 250 ml of
lactated ringers solution, at an infusion rate of 250mg/hr. If the
tubing is calibrated at 15 gtt-1ml, what is the correct flow rate?
(pg 60)
A.
B.
C.
D.
4 gtt/min
8 gtt/min
16 gtt/min
100 gtt/min
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5. The nurse adds 120 mg of morphine sulfate, as ordered, to 500
ml of D5W to be infused at a rate of 0.3mg/min. What will be the
flow rate for this narcotic if the tubing is labeled as 10 gtt = 1
ml. (pg 69)
A.
B.
C.
D.
8 gtt/min
10 gtt/min
13 gtt/min
22 gtt/min
6. If 500 ml of normal saline solution must be infused in 2 hours
and the IV tubing has a drop factor of 10 gtt=ml. What is the
flow rate for this intravascular expander? (pg 11)
A.
B.
C.
D.
1 gtt/min
15 gtt/min
27 gtt/min
42 gtt/min
7. The nurse begins an infusion of 500 ml of D%W with Penicillin G,
with instructions to infuse at a rate of 20 gtt/min. The drop
factor is 10 gtt/ml. How many milliliters of Penicillin G solution is
this patient receiving every minute? (pg 26)
A.
B.
C.
D.
2 ml/min
4 ml/min
7 ml/min
10 ml/min
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Answers:
1. 12.5 ml/hour
600U X 250 ml = 250 = 12.5/hour
1hr
12,000U 20hr
second set up
12,000U : 250ml :: 600 U : Xml
12,000=250X600
x= 150,000
12,000
x=12.5 ml/hour
2. 50 gtt/minute
2.5mg X 100ml X 10ml
1 min
50 mg 1 ml
X=50 gtt/min
second set up
Milliliters to drops:
1ml : 10 gtt :: 100 ml : X gtt
x= 10 X 100
x = 1,000 gtt
Calculate required minutes.
25 g : 1 min :: 50 mg : x min
2.5 x = 50
x = 50 X 2.5
x = 20 minutes
Calculate the flow rate.
20 min : 1,000 gtt :: 1 min : x gtt
20 X = 1,000
X = 1,000
20
X = 50 gtt.min
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3. 13.3 gtt/min
60 mg x 1,000ml x 20 gtt = 40 gtt
60 min 1,500mg 1ml
3 min = 13.3 or 13gtt/min
second set up
Milliliters to drops
1ml: 20 gtt :: 1,000 ml : x gtt
x = 20 x 1,000
x = 20,000 gtt
Minutes
60 mg: 60 min:: 1,500mg : x min
X = 1,500 min
Flow Rate
1,500 min : 20,000 gtt :: 1 min X gtt
1,500X = 20,000
X = 20,000
1,500
X = 13.3 or 13 gtt/minute
4. 15.6 or 16 gtt/minute
250mg x 250ml x 15gtt = 250gtt
60 min 1,000mg 1 ml
16 min
second set up
Milliliters to drops
1ml : 15 gtt:: 250 ml : x gtt
x = 15 x 250
x = 3,750 gtt
= 15.6 or 16 gtt/min
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Required minutes
250 mg : 60 min :: 1,000 mg : x min
250 X = 60 x 1,000
x= 60,000
250
x = 240 minutes
Flow rate
240 min : 3,750 :: 1 min : x gtt
240 x = 3,750
x = 3,750
240
x = 15.6 or 16 gtt/minute
5. 12.5 / 13 gtt/min
0.3mg x 500ml x 10 gtt = 150gtt = 12.5 or 13 gtt min
1 min
120 mg 1 ml
12 min
second set up
Milliliters to drops
1 ml: 10 gtt :: 500 ml : x gtt
x = 10 X500
x = 5,000 gtt
Required minutes
0.3 mg : 1 min :: 120 mg : x min
0.3 x = 120
x = 120
0.3
x = 400 min
Flow rate
400 min : 5,000 gtt :: 1 min : x gtt
400 X = 5,000
x= 5,000
400
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12.5 or 13 gtt/min
6. 41.6 or 42 gtt/minute
500ml x 10 gtt x 1 hr = 500 gtt = 41.6 or 42 gtt/min
2 hr
1 ml
60 min 12 min
Milliliters to drops
1ml : 10 gtts :: 500 ml : x gtt
x – 10 x 500
x = 5,000 gtt
Hours to minutes
1 hr : 60 min :: 2 hr : x min
x = 60 x 2
x = 120 minutes
Flow rate
120 min : 5,000 gtt :: 1 min : xgtt
120x = 5,000
x = 5,000
250
x = 41.6 or 42 gtt/min
7. 2ml/min
20gtt x 1ml
1 min
10gtt = 2ml/minute
10 gtt : 1 ml :: 20 gtt : x ml
x = 20
10
x = 2ml/min
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