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J Clin Pathol Qual Control. 2000 Jun;22(1):139-152. Korean. Original Article.
Kim J , Kwon K , Kim C , Min W , Park S , Han T , Song J , Lee S , Lee E , Choi T .
Inborn Error of Metabolism Subcommittee, The Korean Association of Quality Assurance for Clinical Pathology, Seoul, Korea.

Two trials of external quality assessment for inborn error of metabolism was performed in 1999. In Trial 1, 6 specimens for neonatal screening test were distributed to 56 laboratories with a response rate of 78.6%. Three specimens were distributed to 64 laboratories with 50 returns (78.1%) in Trial II. All the control materials were sent as a filter paper form. Each laboratory replied the test result as the screening items they were doing as a routine test at the reception of the specimen among PKU screening, neonatal TSH, neonatal T4 (total, free), galactosemia screen, 17-OH progesterone, maple syrup urine disease (MSUD) screen, homocystinuria screen and histidinemia screen. The median, range, mean, SD, and CV were analyzed.

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