A 2 year old baby has weight 9 kg . How much fluid would give to baby?

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

The Holliday-Segar method, or the '4-2-1 rule', is the standard for calculating maintenance fluid rates in children.
For the first 10 kg of body weight, the rule specifies a rate of 4 mL/kg/hour.
Since the baby weighs 9 kg, this falls entirely within the first weight bracket.
The calculation is straightforward: 9 kg × 4 mL/kg/hr = 36 mL/hr. The question asks for the rate per kg, which is 4 mL/kg/hour.

Option B: This rate is incorrect for a 9 kg child. It applies to the portion of a child's weight between 11 kg and 20 kg.
Option C: This rate is incorrect for a 9 kg child. It is used for the portion of a child's weight that is above 20 kg.
Option D: This rate is excessively high for maintenance fluids in any standard pediatric calculation and would pose a significant risk of fluid overload.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pediatric maintenance fluid calculation using the Holliday-Segar method (4-2-1 rule) as background academic context rather than a clinical decision trigger.
Accurate maintenance fluid calculation is a fundamental nursing skill to prevent iatrogenic dehydration or fluid overload, both of which can have severe consequences in children, such as cerebral edema or cardiovascular collapse.
Nurses are responsible for administering IV fluids as prescribed, monitoring the infusion rate, and assessing the patient's response, including urine output, skin turgor, and mental status.
What if the child weighed 12 kg? The calculation would be: (10 kg × 4 mL/kg/hr) + (2 kg × 2 mL/kg/hr) = 40 mL/hr + 4 mL/hr = 44 mL/hr. This demonstrates the tiered application of the rule.

How to Approach the Question

First, identify the key information provided in the question: the patient's age (2 years) and weight (9 kg).
Recognize that the question is asking for a maintenance fluid rate, which requires a specific formula.
Recall the standard formula for pediatric maintenance fluids: the Holliday-Segar (4-2-1) rule.
Apply the patient's weight (9 kg) to the formula. Since 9 kg is less than 10 kg, use the first part of the rule: 4 mL/kg/hour.
Select the option that matches this rate.
Mentally check the other options to confirm they correspond to the other tiers of the formula, reinforcing your choice.

Concept Tested & Keywords

Concept Tested: Pediatric maintenance fluid calculation using the Holliday-Segar method (4-2-1 rule).
Stem keywords: 2 year old, baby, weight 9 kg, fluid
Lead-in keywords: How much
Clinical cues: Patient is a 2-year-old baby weighing 9 kg, which is a key parameter for pediatric calculations.

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 571-573

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 55-57

Practise the full NORCET 3 - 2022 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.