A doctor prescribed IV fluids as 50 ml NS 0.9%, 10 ml D50%, and 50 ml RL, which should be administered in 2 hours via a standard pediatric burette set. How many drops per minute should be administered?

1. A

   50 drops/min

2. B

   55 drops/min

3. C

   60 drops/min

4. D

   110 drops/min

Appeared in: NORCERT 8 Mains-2025

Explanation

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• The first step is to calculate the total volume to be infused, which is 50 ml + 10 ml + 50 ml = 110 ml.
• The second step is to identify the drop factor. A 'standard pediatric burette set' is a microdrip set, which has a standard drop factor of 60 gtt/mL.
• The third step is to convert the total infusion time from hours to minutes: 2 hours × 60 minutes/hour = 120 minutes.
• Finally, apply the IV drip rate formula: (Total Volume × Drop Factor) / Time in minutes.
• The calculation is (110 ml × 60 gtt/ml) / 120 min, which equals 6600 / 120 = 55 gtt/min.

Why Other Options Were Wrong

• Option A: This is an incorrect calculation. It may result from miscalculating the total volume or using an incorrect drop factor.
• Option C: This value represents the drop factor (60 gtt/ml) of the microdrip set, not the final calculated drip rate.
• Option D: This value represents the total volume (110 ml) to be infused, not the rate in drops per minute. A common error is to forget to divide by the time.

Related Visual

• Visual 1: Infographic - A clear, step-by-step infographic showing the formula for IV drip rate calculation: Flow Rate = (Total Volume × Drop Factor) / Time.
• Visual 2: Diagram - An annotated diagram of a pediatric burette (volumetric) set, highlighting the drip chamber and explaining that it is a microdrip system (60 gtt/mL).

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain IV Drip Rate Calculation as background academic context rather than a clinical decision trigger.
• Accurate IV fluid calculation is a critical nursing skill to prevent fluid overload or under-hydration, especially in vulnerable populations like pediatric patients.
• Administering fluids too quickly can lead to serious complications such as pulmonary edema and cardiac strain. Administering too slowly can result in ineffective treatment and dehydration.
• What if the prescription was for an adult using a macrodrip set with a drop factor of 15 gtt/mL? The calculation would be (110 ml × 15 gtt/mL) / 120 min = 13.75, which would be rounded to 14 gtt/min. This highlights how the type of IV set drastically changes the flow rate.

How to Approach the Question

• First, identify the question type. This is a drug calculation problem requiring a specific formula.
• Second, extract all the necessary numerical data from the problem: total volume, total time, and drop factor.
• Third, sum the individual fluid amounts to find the total volume (50 + 10 + 50 = 110 ml).
• Fourth, identify the drop factor. Recognize that a 'pediatric burette set' implies a microdrip set, which has a drop factor of 60 gtt/mL.
• Fifth, convert the infusion time to the required unit (hours to minutes: 2 hr = 120 min).
• Finally, substitute these values into the standard formula: (Volume × Drop Factor) / Time. Calculate the result and match it to the given options.

Concept Tested & Keywords

• Concept Tested: IV Drip Rate Calculation
• Stem keywords: IV fluids, pediatric burette set, drops per minute, drug calculation
• Lead-in keywords: How many
• Clinical cues: The use of a 'pediatric burette set' is a key detail, as it signifies a microdrip set with a specific drop factor.

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