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Dry blood spot immunoreactive trypsin was measured by radioimmunoassay in 84 preterm babies and in 65 full-term newborns studied daily from the first to the fifth day of life. In a control group of 3858 full-term newborns, trypsin concentrations at days 4-6 of life exhibited a log-normal pattern distribution, the geometric mean being 18 ng/ml serum. Immunoreactive trypsin concentrations did not change significantly between days 1, 2, 3, 4 and 5 after birth. Immunoreactive trypsin was found to be significantly lower (geometric mean 9 ng/ml, P less than 0.01) in preterm newborns before 32 weeks of gestation. In hypotrophic newborns of 34 weeks gestational age, immunoreactive trypsin values were higher than those observed at 31 weeks of gestation in eutrophic newborns, the mean birth weight not being different between both groups. These data suggest that trypsin production by the pancreas is dependent on maturity but does not seem related to intrauterine nutritional status. Immunoreactive trypsin concentrations do not change after 32 weeks gestational age and during the first postnatal week.

Variations in dried blood spot immunoreactive trypsin in relation to gestational age and during the first week of life