Which clinical factors can prompt adjustment of Holliday-Segar fluid rates?

• A. Fever and tachypnea
• B. Blood type
• C. Sleep pattern
• D. Hair color

Answer: (A)

When using Holliday-Segar maintenance to guide IV fluid rates, you’re starting from baseline needs based on weight to cover ongoing losses. But clinical factors that raise daily water losses or metabolic demand require adjusting that baseline. Fever raises body temperature and metabolic rate, which increases insensible water loss through the skin and mucous membranes. Tachypnea increases evaporative water loss with every breath. Together, these factors raise the patient’s fluid needs beyond the standard maintenance calculation, so the rate should be increased accordingly.

In contrast, factors like blood type, sleep pattern, or hair color do not affect fluid losses or metabolic requirements in a way that would necessitate changing maintenance rates, so they aren’t factors that prompt adjustment.