A 5 years old child, his weight is 18 kg. Which size of Foley's catheter would be appropriate for this child?

NIMHANS Nursing Officer - 2021

Child Health Nursing (Pediatrics)

Medium

Appeared in: NIMHANS Nursing Officer - 2021

Explanation

For a 5-year-old child, standard pediatric guidelines recommend a catheter size of 10-12 Fr.
A common formula to estimate pediatric catheter size is (Age in years / 2) + 8. For this child, (5/2) + 8 = 10.5, which rounds to a 10 Fr or 11 Fr catheter.
The child's weight of 18 kg is appropriate for a 5-year-old, and a 10 Fr catheter is suitable for the preschool and school-age group.
Choosing a 10 Fr catheter balances the need for adequate urine drainage with the goal of minimizing urethral trauma.

Option A: A 6 Fr catheter is too small for a 5-year-old child. This size is typically reserved for infants and would likely lead to urine leakage around the catheter and inefficient drainage.
Option B: An 8 Fr catheter is generally used for toddlers (1-3 years). While it might be used for a smaller preschooler, a 10 Fr is more appropriate for a 5-year-old weighing 18 kg to ensure adequate drainage and prevent leakage.
Option D: A 12 Fr catheter is at the upper end of the range for a preschooler and is more commonly used for older, school-aged children. While not definitively wrong, starting with a 10 Fr is a more cautious approach to minimize potential urethral irritation or trauma.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pediatric urinary catheter sizing as background academic context rather than a clinical decision trigger.
Selecting the correct catheter size is a critical nursing skill to prevent patient harm. An incorrectly sized catheter can cause urethral trauma, pain, bladder spasms, and increase the risk of catheter-associated urinary tract infections (CAUTIs).
Nurses must always use the smallest appropriate catheter size that will allow for adequate drainage. This minimizes irritation to the urethral mucosa.
What if? If the nurse attempted to insert a 10 Fr catheter and met significant resistance, they should not force it. The next step would be to stop, notify the primary healthcare provider, and consider trying a smaller size (like 8 Fr) or investigating a potential urethral stricture or other anatomical issue.

How to Approach the Question

First, identify the key information in the question: the patient's age (5 years) and weight (18 kg).
Recognize that the question is asking for the appropriate size of a medical device (Foley's catheter) for a pediatric patient.
Recall or look up standard pediatric guidelines for catheter sizing. This can be based on age-group charts or estimation formulas.
Apply a common formula, such as (Age / 2) + 8. Calculate: (5 / 2) + 8 = 10.5.
Alternatively, recall age-based categories. A 5-year-old is a preschooler, for whom 10-12 Fr is the typical range.
Compare your calculated/recalled size (10 Fr) with the given options and select the closest match.

Concept Tested & Keywords

Concept Tested: Pediatric urinary catheter sizing
Stem keywords: 5 years old child, weight 18 kg, Foley's catheter, appropriate size
Lead-in keywords: Which size
Clinical cues: Patient is a 5-year-old child, which places them in the preschool age group for equipment sizing.
Clinical cues: Weight is 18 kg, which is a normal weight for a 5-year-old and helps confirm age-based sizing.

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E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 3 (pp 477-702 of 713) p. 189-191

E6 Nursing Fundamentals Taylor pp. 602-604, 653-655