Using Mosteller's formula, a child with height 110 cm and weight 22 kg would have an estimated daily maintenance fluid of approximately which amount?

Using Mosteller's formula, a child with height 110 cm and weight 22 kg would have an estimated daily maintenance fluid of approximately which amount?

• A. 900 mL/day
• B. 1200 mL/day
• C. 1230 mL/day
• D. 1500 mL/day

Answer: (C)

Mosteller’s approach uses body surface area to tailor daily fluid needs, reflecting how metabolic rate and hydration requirements correlate with surface area rather than just weight. The maintenance fluid in this approach is commonly estimated as approximately 1500 mL per square meter of body surface area per day. First compute body surface area: BSA = sqrt[(height in cm × weight in kg) / 3600] Plugging in height 110 cm and weight 22 kg: sqrt[(110 × 22) / 3600] = sqrt(2420 / 3600) ≈ sqrt(0.672) ≈ 0.82 m^2. Then estimate daily maintenance fluid: 0.82 m^2 × 1500 mL/m^2/day ≈ 1230 mL/day. So the estimated daily maintenance fluid is about 1230 mL per day.

Mosteller’s approach uses body surface area to tailor daily fluid needs, reflecting how metabolic rate and hydration requirements correlate with surface area rather than just weight. The maintenance fluid in this approach is commonly estimated as approximately 1500 mL per square meter of body surface area per day.

First compute body surface area:

BSA = sqrt[(height in cm × weight in kg) / 3600]

Plugging in height 110 cm and weight 22 kg: sqrt[(110 × 22) / 3600] = sqrt(2420 / 3600) ≈ sqrt(0.672) ≈ 0.82 m^2.

Then estimate daily maintenance fluid:

0.82 m^2 × 1500 mL/m^2/day ≈ 1230 mL/day.

So the estimated daily maintenance fluid is about 1230 mL per day.