MP CHO - 2022
Nursing Foundation
Hard
Calculate the drop rate for a 3-hour (1 ml = 20 Drop) and 120 ml intravenous IV plan?
Appeared in: MP CHO - 2022
Explanation
- determined using the standard formula for IV drip rate: Drip Rate = (Total Volume × Drop Factor) / Time in minutes.
- First, the total time must be converted from hours to minutes: 3 hours × 60 minutes/hour = 180 minutes.
- Plugging the values into the formula: (120 mL × 20 gtt/mL) / 180 minutes = 2400 / 180 = 13.33 drops/minute.
- Since drops must be whole numbers, the calculated rate of 13.33 is rounded to the nearest whole number, which is 13 drops/minute.
Why Other Options Were Wrong
- Option A: A rate of 10 drops/minute would only deliver 90 mL of fluid over 3 hours, which is significantly less than the prescribed 120 mL.
- Option C: A rate of 15 drops/minute would deliver 135 mL of fluid over 3 hours, which is more than the prescribed 120 mL and could lead to fluid overload.
- Option D: A rate of 20 drops/minute would deliver 180 mL of fluid over 3 hours, a significant overdose compared to the prescribed 120 mL.
Related Visual
- Visual 1: Infographic: A visual breakdown of the IV drip rate formula: Drip Rate = (Volume × Drop Factor) / Time. Each component should be clearly labeled with units.
- Visual 2: Diagram: An illustration of an IV drip chamber, showing how to count the drops falling as a method to manually verify the flow rate.
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 drip rate calculation is a critical nursing skill for patient safety. Incorrect rates can lead to serious complications like fluid overload (hypervolemia) or inadequate fluid replacement (hypovolemia).
- Nurses must always double-check their calculations, especially for high-risk medications. It is also best practice to have another nurse verify the calculation (independent double-check).
- What if the patient was a child? For pediatric patients, a microdrip set (60 gtt/mL) is typically used for greater precision. The calculation would be (120 mL × 60 gtt/mL) / 180 min = 40 drops/minute. This highlights how the equipment choice drastically changes the required drip rate.
How to Approach the Question
- Recognize that this is a mathematical calculation question, a common type in nursing exams.
- Identify the core task: calculate the drip rate in drops per minute.
- Recall the standard formula: Drip Rate = (Total Volume × Drop Factor) / Time in minutes.
- Carefully extract all the given values from the question: Volume (120 mL), Time (3 hours), and Drop Factor (20 gtt/mL).
- Pay close attention to units. Convert the time from hours to minutes before calculating (3 hours = 180 minutes).
- Substitute the values into the formula and solve. Round the final answer to the nearest whole number, as partial drops are not physically possible.
Concept Tested & Keywords
- Concept Tested: IV Drip Rate Calculation
- Stem keywords: Calculate, drop rate, 3-hour, 120 ml, intravenous IV plan, 20 Drop
- Lead-in keywords: Calculate
Question ID
Q2oNVr4LHviKKhGxjgmMLJ
Reference Book
Potter & Perry Fundamentals of Nursing 9th Edition — Part 1 p. 278-289
Practise the full MP CHO - 2022
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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