Results of routine screening for phenylketonuria in early infancy, Northern Ireland (1960-67).

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Abstract
On the basis of observations the ferric chloride/filter paper method of screening for phenylketonuria is regarded as being more reliable than the commonly used Phenistix/napkin test. For this reason it is felt that it is a preferable interim form of screening procedure pending the introduction of more sophisticated and completely automated screening methods. The screening technique as currently employed in Northern Ireland has the additional merit that it can be adopted in any area which has hitherto relied on the Phenistix test, with little administrative inconvenience.

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