A client is to receive 2000 ml of IV fluid in 12 hours. The drop factor is 10 gtt/mL. At how many drops per minute should the flow rate be set?

1. A

   22 drops/min

2. B

   24 drops/min

3. C

   26 drops/min

4. D

   28 drops/min

Appeared in: OSSSC Nursing Officer-2023

Explanation

• The standard formula for calculating IV flow rate is: Flow Rate (gtt/min) = (Total Volume in mL × Drop Factor) / Time in minutes.
• First, the total infusion time must be converted from hours to minutes: 12 hours × 60 minutes/hour = 720 minutes.
• Next, substitute the given values into the formula: (2000 mL × 10 gtt/mL) / 720 minutes.
• The calculation yields: 20000 / 720 ≈ 27.78 gtt/min.
• Since drops must be whole numbers, the calculated rate of 27.78 is rounded to the nearest whole number, which is 28.
• Therefore, the IV flow rate should be set to 28 drops per minute to deliver the prescribed volume in the specified time.

Why Other Options Were Wrong

• Option A: A rate of 22 drops/min would result in significant under-infusion. Over 12 hours, only 1584 mL of fluid would be delivered, which is 416 mL less than the prescribed 2000 mL.
• Option B: A rate of 24 drops/min would also lead to under-infusion. Over 12 hours, 1728 mL of fluid would be delivered, a deficit of 272 mL from the prescribed amount.
• Option C: A rate of 26 drops/min is closer but still incorrect, causing under-infusion. Over 12 hours, 1872 mL would be delivered, which is 128 mL less than the prescribed volume.

Related Visual

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 administration is a fundamental nursing responsibility critical for maintaining a patient's fluid and electrolyte balance. Incorrect rates can lead to serious complications.
• Under-infusion can result in dehydration, electrolyte imbalances, and delayed therapeutic effects of medications. Over-infusion can cause fluid overload, leading to pulmonary edema and cardiac strain, especially in vulnerable patients.
• Nurses must not only calculate the rate correctly but also monitor the infusion regularly (e.g., hourly) to ensure it is flowing as intended and assess the patient for signs of complications.

How to Approach the Question

• First, identify the question as a dosage calculation problem, specifically for an IV drip rate.
• Identify all the necessary components from the question: Total Volume (2000 mL), Total Time (12 hours), and Drop Factor (10 gtt/mL).
• Recall the standard formula: Flow Rate (gtt/min) = (Volume in mL × Drop Factor) / Time in minutes.
• Perform the necessary unit conversion. In this case, convert the infusion time from hours to minutes (12 hours × 60 = 720 minutes).
• Substitute the values into the formula and perform the mathematical calculation: (2000 × 10) / 720.
• Round the final answer to the nearest whole number, as you cannot have a fraction of a drop. Compare your result to the given options to find the correct answer.

Concept Tested & Keywords

• Concept Tested: IV Drip Rate Calculation
• Stem keywords: 2000 ml, IV fluid, 12 hours, drop factor, 10 gtt/mL, drops per minute
• Lead-in keywords: how many

Question ID

QycR9zupPkt_6bXtRaBtj3

Copy ID

Reference Book

E6 Pharmacology Nurses Shanbhag 3e p. 54-56

E6 Nursing Fundamentals Taylor p. 799-801

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 93-95