Fig. 3

Nomograms of phenylalanine (left) tyrosine (right) levels from dried blood spot cards using tandem mass spectrometry, plotted by gestational age, with raw data (top) and adjusted data for time from sample collection (bottom). Lines from top to bottom are 97th (solid), 95th (long dash), 75th (short dash), 50th (thin solid), 25th (short dash), 5th (long dash), and 3rd (solid) centiles.