A patient is prescribed 500 ml of 0.9% Normal Saline to be infused over 4 hours. Using a standard IV set with a drop factor of 15 drops/ml, what should be the correct drip rate in drops per minute?

1. A

   34 drops/min

2. B

   33 drops/min

3. C

   35 drops/min

4. D

   31 drops/min

Appeared in: NORCET 9 Mains - 2025

Explanation

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• derived using the standard formula for IV drip rate calculation: (Total Volume in mL × Drop Factor) / Total Time in minutes.
• First, the total infusion time must be converted from hours to minutes: 4 hours × 60 minutes/hour = 240 minutes.
• Plugging the values into the formula gives: (500 mL × 15 gtt/mL) / 240 min.
• This simplifies to 7500 / 240, which equals 31.25 drops/min.
• Since a fraction of a drop cannot be administered, the result is rounded to the nearest whole number, which is 31.

Why Other Options Were Wrong

• Option A: This value is incorrect. It may result from a miscalculation, such as incorrectly dividing the total drops (7500) or using an incorrect time value.
• Option B: This value is incorrect. It is close to the calculated answer but is not the result of correct rounding. Rounding 31.25 to 33 is a significant error that would lead to a faster infusion rate than prescribed.
• Option C: This value is incorrect and significantly higher than the calculated rate. Administering at this rate would cause the fluid to be infused too quickly, potentially leading to fluid overload.

Related Visual

• Visual 1: Infographic - A clear visual breakdown of the IV drip rate formula: Drip Rate = (Volume × Drop Factor) / Time.
• Visual 2: Diagram - An illustration of an IV drip chamber, showing how drops are counted to regulate the flow rate.
• Visual 3: Chart - A quick-reference chart showing common IV drip rate calculations for different volumes and timeframes.

Clinical Relevance

• Nursing practice connection: Use the key finding related to IV Drip Rate Calculation to guide bedside assessment, documentation, and the next nursing action.
• Accurate IV drip rate calculation is a critical nursing responsibility to ensure patient safety. Incorrect rates can lead to serious complications.
• Administering fluids too slowly can result in dehydration or delayed therapeutic effect of medications.
• Administering fluids too quickly can cause fluid overload, leading to conditions like pulmonary edema, especially in vulnerable patients (e.g., elderly, cardiac or renal patients).

How to Approach the Question

• First, identify that this is a calculation question requiring a specific formula.
• Recall or look up the formula for calculating IV drip rates: Drip Rate = (Volume × Drop Factor) / Time.
• Carefully extract all the necessary values from the question: Total Volume (500 mL), Infusion Time (4 hours), and Drop Factor (15 gtt/mL).
• Check the units. The formula requires time in minutes, so convert the given 4 hours into minutes (4 × 60 = 240 minutes).
• Substitute the values into the formula: (500 × 15) / 240.
• Perform the calculation, which results in 31.25.

Concept Tested & Keywords

• Concept Tested: IV Drip Rate Calculation
• Stem keywords: 500 ml, 0.9% Normal Saline, 4 hours, drop factor, 15 drops/ml, drip rate
• Lead-in keywords: what should be the correct

Question ID

QC02_FsZW1I4XO-v9nBoN2

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