Phenylalanine Testing for Phenylketonuria Diagnosis

The lab analyst determines the presence and amount of the amino acid phenylalanine, most commonly on a filter paper blood spot card or in a blood plasma sample. Phenylketonuria is a rare genetic defect that allows the amino acid phenylalanine to build up abnormally in the body. Choose a location to see hospital-reported price summaries. This page does not show national, sample, or aggregate pricing.