A screening method for biotinidase deficiency in newborns

G. S. Heard, J. R. Secor McVoy, B. Wolf

Research output: Contribution to journalArticlepeer-review

119 Scopus citations


We describe a method for neonatal screening for biotinidase (EC deficiency. Biotinidase activity is assessed colorimetrically from dried samples of whole blood spotted on the same filter papers as used in the neonatal screening for phenylketonuria. After the reaction, samples from normal infants are characteristically purple, whereas those from affected individuals are straw-colored. To confirm the deficiency, the enzyme is quantitatively assayed in additional blood spots or serum. A pilot study has been initiated with samples obtained by the Commonwealth of Virginia for phenylketonuria testing.

Original languageEnglish (US)
Pages (from-to)125-127
Number of pages3
JournalClinical chemistry
Issue number1
StatePublished - 1984

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Biochemistry, medical

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