If using filter paper to obtain collection, obtain filter paper urine collection kit from the Biochemical Genetics Laboratory. The kit includes one 10 X 10 cm absorbent filter paper, patient identification form and directions for specimen collection. Collect as follows:

•  In young infants, collect from a thoroughly wet diaper not contaminated with stool. Remove top layer of diaper if disposable type. Place filter onto diaper and place diaper on flat, hard surface. Place filter paper between two wet portions of diaper and press with fingertips until the filter becomes wet. Do this until the entire filter is damp (filter will look darker).
• Ultra absorbent diapers may present a problem in collecting enough urine and are not recommended for this collection. If ultra absorbent diapers are used, place several cotton balls between the diaper and the baby's genitals. The urine in the cotton ball can then be squeezed onto the filter paper.
• In toilet trained children, collect 5 mL urine.

Place filter paper on top of plastic bag or on a clean non-absorbent surface and let filter paper dry. Label filter paper with patient name and date in pencil (do not use ink). Place dried filter paper and identification form in a plastic leakproof bag.