Risk factors for quantity not sufficient sweat collection in infants 3 months or younger.

Objectives: The purpose is to identify demographic characteristics associated with a quantity not sufficient (QNS) sweat collection in infants 3 months or younger.

Methods: History of premature birth, infant race and sex, gestational age at delivery, and weight of the infant were compared with QNS collection.

Results: Of 221 sweat collections from 197 infants, 25 were QNS.