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Approach to newborn screening for congenital hypothyroidism across the United States of America.
* TSH or T4 testing on original sample is subsequently performed if initial T4 or TSH test was abnormal.
** TSH concentrations between the cutoff for normal results, but below the cutoff for direct action (median (IQR) of 50 (50–60) mU/ml).
NBS=Newborn Screen, TSH = thyroid stimulating hormone, T4 = thyroxine.
