A nurse is caring for a preschool-age child who weighs 18kg. What is the child’s daily maintenance fluid requirement? (Round the answer to the nearest whole number.)
The correct answer and explanation is :
To calculate the daily maintenance fluid requirement for a preschool-age child, we can use the commonly accepted method based on the child’s weight.
The formula to estimate maintenance fluid requirements for children is as follows:
- 100 mL/kg for the first 10 kg of body weight
- 50 mL/kg for the next 10 kg of body weight
- 20 mL/kg for each kg above 20 kg
Step-by-step calculation:
For a preschool-age child who weighs 18 kg, the fluid requirement is calculated in two parts:
- For the first 10 kg:
10 kg × 100 mL = 1,000 mL - For the next 8 kg (since the child weighs 18 kg, the remaining weight is 18 – 10 = 8 kg):
8 kg × 50 mL = 400 mL
Total daily fluid requirement:
Now, we add the two parts together:
- 1,000 mL + 400 mL = 1,400 mL
Thus, the child’s daily maintenance fluid requirement is 1,400 mL.
Explanation:
The purpose of calculating a child’s maintenance fluid requirement is to ensure that they receive adequate hydration to maintain normal bodily functions. This includes fluid for cellular processes, thermoregulation, digestion, and excretion. The need for maintenance fluids increases with the child’s weight, as larger bodies require more fluid to function effectively.
The formula used is an adaptation of the Holliday-Segar method, which is widely employed in clinical practice to estimate daily fluid needs for children. The method takes into account the body weight of the child and the expected fluid requirements for different weight ranges. It is essential to assess fluid intake in pediatric patients carefully, as both under-hydration and over-hydration can lead to significant health issues.
In clinical practice, these calculations guide nurses and healthcare providers in administering intravenous fluids or ensuring the child consumes adequate oral fluids. Adjustments may be made based on the child’s clinical condition (e.g., fever, diarrhea, or other illnesses), but the 1,400 mL is a good baseline for a healthy child weighing 18 kg.