Measurement of methotrexate in human cerebrospinal fluid using a chemiluminescence immunoassay intended for serum and plasma matrices. Issue 3 (22nd November 2020)

• Record Type: Journal Article
• Authors: Yoshikawa, Naoki; Yamada, Ai; Yokota, Tsubasa; Moritake, Hiroshi; Hirabara, Yasutoshi; Ikeda, Ryuji
• Is Part Of: Journal of clinical laboratory analysis. Volume 35:Issue 3(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-11-22
• Subjects: cerebrospinal fluid -- chemiluminescence immunoassay -- high‐performance liquid chromatography -- methotrexate -- Passing‐Bablok; Diagnosis, Laboratory -- Periodicals; Medical laboratory technology -- Periodicals; 616
• DOI: 10.1002/jcla.23661
• Languages: English
• ISSNs: 0887-8013

Abstract

Abstract: Background: The concentration of MTX in blood is often measured quickly and easily by immunoassays. Thus, immunoassays may facilitate the easy determination of the concentration of MTX in the cerebrospinal fluid (CSF). In this study, we measured methotrexate (MTX) concentrations in the CSF using a high‐performance liquid chromatography (HPLC) method intended for analyzing CSF matrices and a chemiluminescence immunoassay (CLIA) method intended for assessing serum and plasma matrices and verified the differences in the results of the two methods. Methods: HPLC analysis for MTX in the CSF was performed using a Prominence UFLC system with a C18 column. The HPLC method was validated in accordance with the 2018 FDA guideline. The CLIA method was performed using an ARCHITECT i1000SR system intended for serum and plasma matrices. A total of 47 CSF samples (14 clinical and 33 spiked specimens) were analyzed using the two methods. Results: The HPLC method passed the validation criteria. The concentration of MTX in the same sample, determined using the HPLC and CLIA methods, differed proportionally; the percent difference in the concentrations averaged −23.0% (95% confidence interval: −36.9% to −9.1%) as revealed by the Bland‐Altman plot. The relationship between the measured values, evaluated using the Passing‐Bablok regression, was as follows: HPLC = 1.205 × CLIA – 0.024. Conclusion: The equation deduced in this study can be used to correct the concentration of MTX measured using the CLIA method. Abstract : MTX concentrations in the CSF were measured using a HPLC method intended for analyzing CSF matrices and a CLIA method intended for assessing serum and plasma matrices, and the differences in the results of the two methods were verified. The concentration of MTX in the same sample, determined using the HPLC and CLIA methods, differed proportionally.