If 3000 ml of fluid is to be given to a patient in 24 hours, what will be the flow rate?

Bihar CHO - 2021

Fundamental of Nursing

Hard

Appeared in: Bihar CHO - 2021

Explanation

First, calculate the hourly infusion rate by dividing the total volume by the total time: 3000 mL / 24 hours = 125 mL/hour.
The formula to calculate the flow rate in drops per minute (gtt/min) is: (Volume in mL/hr × Drop Factor in gtt/mL) / 60 minutes.
Since the drop factor is not specified, a standard macrodrip factor of 15 gtt/mL is assumed, as this is common practice and leads to one of the given options.
Using this formula, the calculation is: (125 mL/hr × 15 gtt/mL) / 60 min = 31.25 gtt/min.
Rounding 31.25 to the nearest whole number gives the final answer of 31 drops/minute.

Option B: This rate is too slow. It might be incorrectly chosen if the drop factor (15 gtt/mL) is mistaken for the final flow rate.
Option C: This rate is incorrect and likely the result of a calculation error, such as using an incorrect drop factor or miscalculating the hourly rate.
Option D: This rate is significantly too fast and would result from a major calculation error.

Clinical Relevance

Nursing practice connection: Use the key finding related to IV flow rate calculation to guide bedside assessment, documentation, and the next nursing action.
Accurate calculation of IV flow rates is a fundamental nursing skill crucial for patient safety. Administering fluids too quickly can lead to fluid overload and cardiac complications, while administering them too slowly can result in dehydration or delayed therapeutic effect.
Nurses must always verify the drop factor on the IV tubing package before starting an infusion, as different manufacturers have different macrodrip factors (10, 15, or 20 gtt/mL).
What if? If the order was for a pediatric patient and a microdrip set (60 gtt/mL) was used, the flow rate would be much higher in drops: (125 mL/hr × 60 gtt/mL) / 60 = 125 drops/minute. This high drip rate necessitates the use of an electronic infusion pump for accuracy and safety.

How to Approach the Question

First, identify the key information given in the problem: Total Volume (3000 mL) and Total Time (24 hours).
Recognize that the question asks for the rate in 'drops/minute', which means you will need a 'drop factor' to complete the calculation.
Note that the drop factor is not provided. In nursing exam questions, this often implies you should test standard drop factors (10, 15, 20 for macrodrip; 60 for microdrip) to see which one yields an answer matching the options.
Calculate the hourly rate first: 3000 mL ÷ 24 hours = 125 mL/hr. This simplifies the next step.
Apply the standard formula: Flow Rate (gtt/min) = (Volume per hour × Drop Factor) ÷ 60.
Test the formula with a common drop factor, like 15 gtt/mL: (125 × 15) ÷ 60 = 31.25. This value rounds to 31, which matches one of the options.

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