Module 5 — IV Flow Rate Calculations¶
Intravenous (IV) therapy delivers fluids, electrolytes, and medications directly into the bloodstream. This module applies unit cancellation to IV calculations — programming pump rates, calculating how long a bag will run, counting gravity drip rates, and verifying continuous medication infusions.
This module builds directly on unit cancellation from Module 2 and the dosage calculation skills from Module 4.
What You'll Learn¶
By the end of this module you should be able to:
- Calculate IV flow rates in mL/hr for pump programming
- Calculate infusion time for a given volume and rate
- Calculate drip rates in drops per minute (gtt/min) for gravity infusions
- Calculate flow rates for continuous IV medication infusions
- Verify doses from running infusion rates
- Identify and respond to unreasonable pump settings
Topics¶
| Topic | Key Skills |
|---|---|
| IV Flow Rates | mL/hr calculations, time conversion, pump programming |
| Infusion Time | Duration, completion time, remaining volume |
| Drip Rates | gtt/min, drop factors, microdrip shortcut |
| IV Medications | Concentration, dose rates, weight-based infusions |
Estimated Time¶
Approximately 2–2.5 hours including practice problems.
Clinical Relevance¶
IV Errors Are Especially Dangerous
Unlike oral medications, which are absorbed gradually, IV medications enter the bloodstream instantly. There is no opportunity to reverse an error once an infusion has begun.
Always verify your calculation and the pump settings independently before starting an infusion.
Equipment You Will Use
| Equipment | Purpose |
|---|---|
| IV infusion pump | Precise rate control in mL/hr |
| Macrodrip set (10–20 gtt/mL) | Standard gravity infusions |
| Microdrip set (60 gtt/mL) | Precise low-volume infusions |
| Burette | Pediatric and critical care dosing |
Before You Begin
Make sure you are comfortable with unit cancellation from Module 2. Every calculation in this module is a unit cancellation chain — time, volume, concentration, and rate all need to cancel correctly.
If any setup feels unclear, return to Unit Cancellation before continuing.