Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Robier, C; Neubauer, M; Quehenberger, F; Stettin, M; Rainer, F.
Calcium pyrophosphate and monosodium urate crystals in synovial fluid as a cause of pseudoeosinophilia.
CLIN CHEM LAB MED. 2011; 49(8): 1345-1347.
Doi: 10.1515/CCLM.2011.212
Web of Science
PubMed
FullText
FullText_MUG
- Führende Autor*innen der Med Uni Graz
- Robier Christoph
- Co-Autor*innen der Med Uni Graz
- Quehenberger Franz
- Stettin Mariana
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- Abstract:
- Background: Synovial fluid (SF) leukocytes can be counted microscopically in a Neubauer chamber or by automated procedures using haematology analysers. Knowledge of laboratory artefacts is crucial for the correct interpretation of results obtained using automated methods. SF pseudoeosinophilia has recently been described as a new artefact in patients with crystal-related arthropathies. We investigated whether pseudoeosinophilia of SF is restricted to crystal-related disorders, or if it may also occur in other arthropathies. Methods: We compared the percentages of eosinophils in 120 crystal containing SF samples with 185 crystal-free specimens using the Wilcoxon test. Crystal positive samples, determined by polarised microscopy, contained at least two monosodium urate or calcium pyrophosphate crystals per 10 high power fields (630x magnification). True SF eosinophilia was ruled out by microscopic examination of stained slides. Results: Crystal positive samples had significantly higher percentages of eosinophils than the controls (p<0.0001). No significant differences between the two crystal types were found (p=0.693). Thus, pseudoeosinophilia was significantly correlated with the presence of crystals, and none of the distinct crystal types was more likely to be associated with pseudoeosinophilia. Conclusions: In this study, SF pseudoeosinophilia was confirmed as a crystal-related laboratory artefact which has to be considered in the interpretation of automated SF leukocyte differential counts.
- Find related publications in this database (using NLM MeSH Indexing)
- Adult -
- Aged -
- Aged, 80 and over -
- Calcium Pyrophosphate - chemistry
- Crystallization -
- Diagnostic Errors -
- Eosinophilia - diagnosis
- Female -
- Humans -
- Leukocyte Count -
- Male -
- Microscopy, Polarization -
- Middle Aged -
- Synovial Fluid - chemistry
- Uric Acid - chemistry
- Find related publications in this database (Keywords)
- calcium pyrophosphate
- eosinophilia
- monosodium urate
- pseudoeosinophilia
- synovial fluid