Many countries do not have a newborn screening (NBS) program, and immigrants from such countries are at risk for late diagnosis of phenylketonuria (PKU). In this international survey, 52 of 259 patients (20%) with late diagnosed PKU were immigrants, and 145 of the 259 (55%) were born before NBS or in a location without NBS.

中文翻译：

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未确诊的苯丙酮尿​​症无处不在：一项国际调查的结果

许多国家没有新生儿筛查 (NBS) 计划，来自这些国家的移民有晚诊断苯丙酮尿症 (PKU) 的风险。在这项国际调查中，259 名晚期诊断 PKU 患者中有 52 名 (20%) 是移民，259 名患者中有 145 名 (55%) 出生在 NBS 之前或没有 NBS 的地方。