Question

Calculate the flow rate:

a. 1000 ml D5W, infuse over 8 hours: ______________________

b. 1000 ml 0.9% NaCl, infuse over 12 hours: _____________________

c. 500 ml 0.45% NaCl, infuse over 6 hours_________________________

1. Calculate the drip rate:   Round rates to the nearest gtt.
   1. Lactated Ringers Solution, infuse at 100 ml/hr, 15 gtt/ml factor tubing. _____________

2. 500 ml D5W with 1 gm Ancef, infuse at 75ml/hr, 10 gtt/ml factor tubing: ____________

3. 1000 ml 0.9% Normal Saline, infuse at 60 ml/hr, 60 gtt/ml factor tubing: ____________

Answer 1

1. FLOW RATE CALCULATION

Flow rate = Total volume (ml) / Time in hours

a. Volume of D5W = 1000ml

Time = 8 hours

Flow rate = 1000/8 = 125ml/hour.

b. Volume of 0.9% NaCl = 1000ml

Time = 12 hours

Flow rate = 1000/12 = 83.3 = 83ml/hour

c. Volume of 0.45% NaCl = 500ml

time = 6 hours

Flow rate = 500/6 = 83.3 = 83ml/hour

2. DRIP RATE CALCULATION

Drip rate = Total volume (ml) / Time in minutes x drop factor

a. Volume of Ringer Lactate = 100ml

Time = 1 hour 1 x 60 = 60 minutes

Drop factor = 15gtt/ml

Drip rate = 100 / 60 x 15 = 25gtt/min

b. IT CAN BE SOLVED IN TWO WAYS:

1) Volume of D5W = 75ml, Time = 1 hour (1 x 60 = 60min), drop factor = 10 Drip rate = 75 / 60 x 10 = 12.5gtt/min = 13gtt/min

2) Volume of D5W 500ml

Here we have to calculate infusion time. Infusion time = Total volume (ml) / Flow rate(ml/hour) = 500 / 75 = 6.6 hours = 6.6 x 60 = 396min Substitute this in the drip rate formula,   Drip rate = 500 / 396 x 10 = 12.6 = 13gtt/min

c. Volume of 0.9% Normal Saline = 1000ml

Time = 1000 / 60 = 16.6 hours = 996 minutes

Drop factor = 60gtt/ml

Drip rate = 1000 / 996 x 60 = 60 gtt/min

This can be calculated by the other way also which I have mentioned in the previous question.