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Option 1 : 42 drops/minute

Concept:-

  • The IV drip rate is a way of describing the rate of intravenous infusion based on the number of drops (gtt) administered per minute to the patient.
    • Drops/min = (drop factor) × times (Hourly Infusion Rate) × times (time)
    • Drops/min = Drops/ml × times ml/hour × times 1 hour

Canceling the labels, 

We get, 

  • Drops per minute = (Drop factor / Hour) × times Hourly Infusion Rate
  • Drops per minute = (500/12) × times 1 = 41.66 \approx. 42

 

Gravity Flow Rate Drip Chart

Flow Rate

(mL/hr)

10 gtt/mL 

(drops/min)

15 gtt/mL 

(drops/min)

20 gtts/mL 

(drops/min)

60 gtts/mL 

(drops/min)

10

2

2

3

10

25

4

6

8

25

50

8

12

17

50

75

12

19

25

75

100

17

25

33

100

125

21

31

42

135

150

25

37

50

150

200

33

50

67

200

250

42

62

83

250

500

83

125

167

500

1,000

167

250

333

1,000

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