Monitoring phenylalanine concentrations in the follow-up of phenylketonuria patients: An inventory of pre-analytical and analytical variation.
Coene KLM, Timmer C, Goorden SMI, Ten Hoedt AE, Kluijtmans LAJ, Janssen MCH, Rennings AJM, Prinsen HCMT, Wamelink MMC, Ruijter GJG, Körver-Keularts IMLW, Heiner-Fokkema MR, van Spronsen FJ, Hollak CE, Vaz FM, Bosch AM, Huigen MCDG
JIMD reports, 2021 Mar
Abstract
Reliable measurement of phenylalanine (Phe) is a prerequisite for adequate follow-up of phenylketonuria (PKU) patients. However, previous studies have raised concerns on the intercomparability of plasma and dried blood spot (DBS) Phe results. In this study, we made an inventory of differences in (pre-)analytical methodology used for Phe determination across Dutch laboratories, and compared DBS and plasma results.