Weight-adjusted neonatal 17OH-progesterone cutoff levels improve the efficiency of newborn screening for congenital adrenal hyperplasia ABSTRACTObjective: To evaluate weight-adjusted strategy for levels of neonatal-17OHP in order to improve newborn screening (NBS) efficiency. Subjects and methods: Blood samples collected between 2-7 days of age from 67,640 newborns were evaluated. When N17OHP levels were ≥ 20 ng/mL, and a second sample was requested. We retrospectively analyzed neonatal-17OHP levels measured by Auto DELFIA-B024-112 assay, grouped according to birth-weight: G1: < 1,500 g, G2: 1,501-2,000 g, G3: 2,000-2,500 g and G4: > 2,500 g. 17OHP cutoff values were determined for each group using the 97. Keywords 21-hydroxylase deficiency; congenital adrenal hyperplasia; newborn screening; neonatal 17OH-progesterone levels; preterm and full-term newborns RESUMO Objetivo: Avaliamos retrospectivamente os valores da 17OHP ajustados para o peso ao nascimento para melhorar a eficiência da triagem neonatal. Sujeitos e métodos: 67.640 recém--nascidos com amostras coletadas entre 2-7 dias de vida. Uma segunda amostra foi solicitada na presença de testes com valores da 17OHP ≥ 20 ng/mL. 17OHP dosada pelo método DELFIA-B024-112 e correlacionada com o peso ao nascimento: G1 < 1.500 g, G2 1.501-2.000 g, G3 2.000-2.500 g e G4 > 2.500 g.