We found a falsely lowered creatinine, measured on a Vitros analyser, in one
sample in a series of four from an IC-patient:
date: nov 15 nov 17 nov 18 nov 18
BUN: 19.1 24.5 26.1 28.2 (url 7.0)
Creat: 172 265 20 !!! 312 (url 130)
All other results fit, so no sample mix-up. Repeating the result of 20 a few
hours later in the same sample, we found 70, considerably higher but still
not fitting. Medication did not give us a clue.
Has someone seen this before and found the cause? Vitros-specific problem?
Thanks.
Maurits Pekelharing
clinical biochemist
Reinier de Graaf Hospital Group
Delft, the Netherlands
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