Abstract：
:Measurement of oxalate in the blood is essential for monitoring primary hyperoxaluria patients with progressive renal impairment and on dialysis prior to transplantation. As no external quality assurance scheme is available for this analyte, we conducted a sample exchange scheme between six laboratories specifically involved with the investigation of primary hyperoxaluria to compare results. The methodologies compared were gas chromatography/mass spectrometry (GCMS), ion chromatography with mass spectrometry (ICMS), and enzymatic methods using oxalate oxidase and spectrophotometry. Although individual laboratories performed well in terms of reproducibility and linearity, there was poor agreement (absolute values) between centres as illustrated by a longer-term comparison of patient results from two of the participating laboratories. This situation was only partly related to differences in calibration and mainly reflected the lower recoveries seen with the ultrafiltration of samples. These findings lead us to conclude that longitudinal monitoring of primary hyperoxaluria patients with deteriorating kidney function should be performed by a single consistent laboratory and the methodology used should always be defined. In addition, plasma oxalate concentrations reported in registry studies and those associated with the risk of systemic oxalosis in published studies need to be interpreted in light of the methodology used. A reference method and external quality assurance scheme for plasma oxalate analysis would be beneficial.
journal_name
Urolithiasisjournal_title
Urolithiasisauthors
Stokes F,Acquaviva-Bourdain C,Hoppe B,Lieske JC,Lindner E,Toulson G,Vaz FM,Rumsby Gdoi
10.1007/s00240-020-01197-4subject
Has Abstractpub_date
2020-12-01 00:00:00pages
473-480issue
6eissn
2194-7228issn
2194-7236pii
10.1007/s00240-020-01197-4journal_volume
48pub_type
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