Laboratory Medicine and Quality Assurance

Table. 1.

Test items and specimens included in the proficiency tests

Test items Category Specimen No. of specimens

Year 2020 Year 2021


1st trial 2nd trial 1st trial 2nd trial
Neonatal screening
Conventional Phenylketonuria DBS 10 10 10 10
Congenital hypothyroidism (TSH, T4) 6 6 6 6
Galactosemia 10 10 10 10
Congenital adrenal hyperplasia (17-hydroxyprogesterone) 10 10 10 10
Maple syrup urine disease 10 10 10 10
Homocystinuria 10 10 10 10
Expanded (MS/MS) About 40 inherited metabolic disorders DBS 10 10 10 10
Other items
Vanillylmandelic acid Urine 3 3 3 3
Homovanillic acid Urine 3 3
Methylmalonic acid Urine 3 3
Plasma 3 3
Organic acids About 70 organic acids Urine 3 3 3 3
Amino acids About 40 amino acids Plasma 3 3 3 3
Catecholamines Dopamin, Epinephrine, Norepinephrine Urine 3 3 3 3
Plasma 3 3 - -
Metanephrines Metanephrine, Normetanephrine Urine 3 3 3 3
Plasma 3 3 3 3

Abbreviations: DBS, dried blood spot; TSH, thyroid-stimulating hormone; T4, thyroxine; MS/MS, tandem mass spectrometry.

Lab Med Qual Assur 2022;44:143~158 https://doi.org/10.15263/jlmqa.2022.44.3.143
© Lab Med Qual Assur