Question

The doctor orders 800ml of an 0.9m/v% NaCl IV to be infused in 9 hours. You have 15gtt/ml IV tubes available. What should the IV rate be set at in gtt/ml? How many grams of NaCl did you give the patient?

Answer 1

Original order = 800 ml / 9 hr. = 88.89 ml/hr.

Convert Original order from 89 ml/hr. to ml/min by dividing with 60 as 1 hr. = 60 mins

Original order = 800 ml / 9 hr. = 88.89 ml/hr. = 88.89 /60 = 0.15 ml/min

Rate of administration = Original order * tubing type = 0.15 ml/min * 15 gtt/ml = 2.25 gtt/min

Rate of administration = 2.25 gtt/min

Mass concentration % = (m/v)*100

where m = mass, v = volume = 800 ml

(m/v)*100 % = 0.9

(m / 800 ml) * 100 = 0.9

m = (0.9 * 800) / 100 = 7.2 g

Mass of NaCl given to patient = 7.2 g