IV Therapy and Drip Rate Calculations
Intravenous therapy requires accurate flow-rate calculation. Nurses compute drops per minute using the volume, drop factor, and infusion time to deliver fluids safely.
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What you must know about IV Drip Rates
Drip rate (drops/min) = (Volume in mL × Drop factor) ÷ Time in minutes.
Common drop factors: macrodrip 15 or 20 drops/mL; microdrip 60 drops/mL.
Flow rate in mL/hr = Total volume ÷ Total hours.
Always convert infusion time to minutes when calculating drops per minute.
Monitor the IV site for infiltration, phlebitis, and infection.
Microdrip (60 drops/mL) is used when precise, small-volume delivery is needed.
NMCN Exam Tips
How this topic appears in the NMCN exam
Memorise the formula: (Volume × Drop factor) ÷ Time in minutes.
Convert hours to minutes before dividing — a frequent trap.
Know the standard drop factors (15, 20, 60 drops/mL).
Round drops per minute to the nearest whole number.
Practice Question
Test yourself
A patient is to receive 1000 mL of normal saline over 8 hours using a giving set with a drop factor of 20 drops/mL. What is the drip rate in drops per minute?
Explanation
Drip rate = (Volume × Drop factor) ÷ Time in minutes = (1000 × 20) ÷ (8 × 60) = 20000 ÷ 480 ≈ 41.7 ≈ 42 drops/min.
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