NCLEX Review Tips: IV Calculation

Here’s a sample NCLEX question with IV calculation:

A nurse cares for a child receiving 40 drops of IV fluid per minute. IV set has a drip factor of 60 drops per ml. How many hours it will take to infuse 400ml ?

The drop factor is 60 drops per ml, so 40 drops will deliver:
60 gtt = 1 ml
40 gtt = X
If you cross-multiply and solve for X it will be; 60X = 40
X = 40 divided by 60 which is 0.67 ml per min.

So to get the answer 0.67ml = 1 min
400ml = X

If you cross-multiply and solve for X it will be 400 divided by 0.67 which is 597 min about 9.95 hours.

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