(1) If a newborn is of very low birth weight, i.e., under 1,500 grams, a sample of its blood must be taken for testing after 24 hours of age and no later than seven days of age, unless medically contraindicated, in which case the sample must be taken as soon as the infant's medical condition permits.

(2) If the infant is not yet feeding when the initial screening sample is collected, a repeat specimen for phenylalanine testing must be taken at least 48 hours following the first ingestion of milk.

(3) In the event that the infant stays in the hospital longer than 14 days, a repeat congenital hypothyroid screening must be made either at the time of the hospital discharge, if the hospital stay is a month or less, or at one month of age if the hospital stay is longer than one month.