# The nurse must infuse 100 mL of IV fluid over 30 minutes. The tubing drop factor is 20 gtt/mL. How many gtt/min should the nurse regulate? Record the answer using a whole number. Round only at the end of the calculation.

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> language: en  
> subject: Parenteral/IV Therapies  
> category: PPT

## Question

The nurse must infuse 100 mL of IV fluid over 30 minutes. The tubing drop factor is 20 gtt/mL. How many gtt/min should the nurse regulate? Record the answer using a whole number. Round only at the end of the calculation.

Record your answer using a whole number.

gtt/min

Enter the number only. The unit is already shown. Round only at the end of the calculation.

Calculator

0

C⌫÷×
789−
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123=
0.Use rounded result

## Explanation

Use (volume × drop factor) ÷ minutes: (100 mL × 20 gtt/mL) ÷ 30 min = 66.67 gtt/min, which rounds to 67 gtt/min.

## In-depth explanation

Quick answer
67 gtt/min.
Set up
Drops per minute = (mL to infuse × gtt/mL) ÷ minutes.
Calculation
(100 × 20) ÷ 30 = 66.666…. Round only the final result to the requested whole number: 67.
**Sources**
- NCSBN — NCLEX Frequently Asked Questions: Calculation Items

- NCSBN — Prepare for the NCLEX

## Key concepts

- **Drop factor** — The number of drops delivered by the tubing for each milliliter of fluid.
- **Gravity infusion** — An infusion regulated by counting drops rather than programming a pump.

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