A newborn is 3 days old, weighs 6 pounds, and has failed to pass meconium.Which of the following tests should be performed and under what conditions?

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After birth, meconium is passed for the first 1 to 3 days of life.Failure to pass meconium is a strong predictor of cystic fibrosis.Testing for cystic fibrosis involves collection of an ample amount of sweat.Prior to 2 weeks of age, there is a high likelihood that an ample amount of sweat may not be obtained for this test.After 2 weeks of age, however, this amount of sweat can usually be collected without difficulty.If possible, testing should not be attempted before a neonate has reached 7 days of age and weighs a minimum of 3 kg (6.6 pounds).

A Newborn Is 3 Days Old, Weighs 6 Pounds, and Has