Table 1.

Average reference weights and volumes for children representing various age groups

Age	Weight (kg)	Normal daily fluid requirement (mL)	Circulating blood volume (mL)	Max allowable sample volume over 2 weeks (mL)
Preterm neonate	1.5	144	120	3.6
Full‐term neonate	4	384	144	9.6
Infant/toddler (3 years)	15	1,250	320	36
Child (12 years)	40	1,920	1,200	96