Question

Give Regular insulin by continuous I.V. infusion at 20 units/hr. The solution is 250 mL NS with 100 units of Regular insulin. What rate (mL/hr) on the infusion pump will deliver the correct dose?

Answer 1

The infusion rate of Insulin to be given = 20 units/ hour

the solution volume is 250ml NS with 100 Units Regular Insulin.

This means if you infuse 250 ml /hr the patient will get 100 units of insulin per hour.

But the patient needs only 20 units of insulin per hour.

So let us calculate in simple mathematics:

250ml solution has 100 units insulin,

then

‘a’ ml solution has 20 units of insulin

250: 100 = a: 20

This means:

250/100 = a/20

So to find out ‘a’,

a= 250×20/100 =50ml

This means we have to keep the rate on infusion pump as 50ml/hr