[Normal urine levels of the aminoterminal telopeptide of type I collagen (NTx) in premature newborns in the first week of life].

Urinary excretion of type I collagen cross-linked aminoterminal telopeptide (NTx) is a specific index of bone resorption. The Authors have studied urinary NTx concentrations in 60 urine samples of preterm infants, from 32 to 36 weeks of gestation, to evaluate the trend of the bone marker in the first week of life. Urine samples were collected at 1, 3 and 7 days of life.