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<p>The Guthrie test was used for detecting phenylketonuria. However, as the newborn
bloodspot screening programme screens for nine rare conditions, the heel prick test
is performed using the newer technique of tandem mass spectrometry to detect conditions.</p><p>Public
Health England (PHE) and NHS England have published the ‘NHS Newborn Blood Spot Screening
Programme Code of Practice for the retention and storage of residual newborn blood
spots’. This code of practice was published in January 2018 and applies to all newborn
blood spot samples. It sets out arrangements for the retention, storage, use and release
of residual newborn blood spots and related information and communication requirements.</p><p>The
retention guidance is currently under review and will be updated shortly.</p>
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