2 pints of IV fluid are prescribed for a client with a 125 ml/hour flow rate. How much time will be required to complete the fluid?

Appeared in: AIIMS Delhi NO - 2018

Explanation

The core of this question is converting pints to milliliters and then using the standard formula for infusion time.
First, convert the total volume: 1 pint is approximately 473 ml, so 2 pints equal 2 x 473 = 946 ml.
Next, calculate the total infusion time using the formula: Time = Total Volume / Flow Rate.
Plugging in the values: Time = 946 ml / 125 ml/hour = 7.57 hours.
The calculated time of 7.57 hours is closest to the 8-hour option provided.

Option A: 6 hours is incorrect. This would imply a total volume of only 750 ml (6 hr * 125 ml/hr), which significantly underestimates the 946 ml to be infused.
Option C: 10 hours is incorrect. This would imply a total volume of 1250 ml (10 hr * 125 ml/hr). This might be chosen if a calculation error occurred, such as using the UK pint conversion (1136 ml) and rounding up significantly.
Option D: 12 hours is incorrect. This would imply a total volume of 1500 ml (12 hr * 125 ml/hr), which is a large overestimation of the actual volume.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain IV fluid infusion time calculation as background academic context rather than a clinical decision trigger.
IV fluid calculation is a fundamental and critical nursing skill. Errors can lead to fluid overload (hypervolemia) or inadequate fluid replacement (hypovolemia), both of which can have serious consequences for the patient.
Always double-check unit conversions before starting an infusion. If unsure about a conversion (e.g., pints, ounces), always consult a drug formulary, pharmacy, or a reliable conversion chart.
What if the order was for 2 units of packed red blood cells (PRBCs) instead of IV fluid? The calculation would be different. A unit of PRBCs has a standard volume (approx. 350 ml) and must be infused within a specific timeframe (usually 2-4 hours) to ensure safety and viability, making the rate calculation dependent on policy, not just a simple division.

How to Approach the Question

First, identify all the numerical values given in the problem: 2 pints (total volume) and 125 ml/hour (flow rate).
Recognize that the units for volume are different (pints vs. ml). The flow rate is in ml/hour, so the total volume must be converted to ml.
Recall or look up the standard medical conversion: 1 pint = 473 ml.
Perform the conversion: 2 pints * 473 ml/pint = 946 ml.
Apply the formula for infusion time: Time = Total Volume ÷ Flow Rate.
Calculate the result: 946 ÷ 125 = 7.57 hours.

Concept Tested & Keywords

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