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An assessment of clinical laboratory performance for the determination of manganese in blood and urine

  • Meredith L. Praamsma , Josiane Arnaud EMAIL logo , David Bisson , Stuart Kerr , Chris F. Harrington , Patrick J. Parsons and the Network of Organisers of External Quality Assurance Schemes in Occupational and Environmental Laboratory Medicine
Published/Copyright: May 12, 2016
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Clinical Chemistry and Laboratory Medicine (CCLM)
From the journal Clinical Chemistry and Laboratory Medicine (CCLM) Volume 54 Issue 12

Abstract

Background:

Proficiency testing or external quality assessment schemes (PT/EQASs) are an important method of assessing laboratory performance. As each scheme establishes assigned values and acceptable ranges for the analyte according to its own criteria, monitoring of participant performance varies according to the scheme and can lead to conflicting conclusions.

Methods:

Standard deviations (SDs) for PT were derived from Thompson’s and biological variation models applied to blood and urine manganese (Mn) robust data from four EQASs from North America and Europe. The fitness for purpose was verified by applying these SDs to individual results.

Results:

Using Thompson characteristic function the relationship between SD and Mn concentration, expressed in nmol/L was the square root of [19.72+(0.07712×Mn concentration2)] for blood and the square root of [6.772+(0.09852×Mn concentration2)] for urine. While the biological variation model was not suitable for urine, it produced an acceptable range for blood as ±54.4 nmol/L (assigned value ≤320 nmol/L) or 17% (assigned value >320 nmol/L). For blood, individual performance evaluated by the two approaches led to similar conclusions.

Conclusions:

The biological variation model can be used to propose quality specifications for blood, however it could not be applied to urine. The Thompson characteristic function model could be applied to derive quality specifications for Mn in urine and, to a lesser extent in blood. The more lenient quality specifications for blood highlight the difficulty of determining Mn in this matrix. Further work is needed to harmonize PT, such as using assigned ranges for the specimens.

Keywords: blood; manganese; proficiency testing; urine

Acknowledgments:

We greatly thank Dr. Marissa G. Baker (University of Washington, WA, USA) for sharing the data presented in her paper on individual variability. We thank the members of the Network of Organisers of EQAS in Occupational and Environmental Laboratory Medicine who gave us the opportunity for fruitful discussions about trace element PT/EQAS. We particularly thank Dr. Cas W. Weykamp (Queen Beatrix hospital, Winterswijk, The Netherlands) for the preparation of OELM samples.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

  5. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.

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Supplemental Material:

The online version of this article (DOI: 10.1515/cclm-2015-1267) offers supplementary material, available to authorized users.

Received: 2015-12-28
Accepted: 2016-3-28
Published Online: 2016-5-12
Published in Print: 2016-12-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/cclm-2015-1267
Keywords for this article
blood; manganese; proficiency testing; urine

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Biomarkers, inflammation and cancer: where to go?
  4. Review
  5. Analysis, detection and quantitation of mixed cryoglobulins in HCV infection: brief review and case examples
  6. Mini Reviews
  7. Calcitonin measurement and immunoassay interference: a case report and literature review
  8. Exosomal non-coding RNAs: a promising cancer biomarker
  9. Opinion Paper
  10. Towards a new paradigm in laboratory medicine: the five rights
  11. EFLM Recommendation
  12. Recommendation for the review of biological reference intervals in medical laboratories
  13. IFCC Position Paper
  14. Assuring the quality of interpretative comments in clinical chemistry
  15. General Clinical Chemistry and Laboratory Medicine
  16. The effect of centrifugation speed and time on pre-analytical platelet activation
  17. An assessment of clinical laboratory performance for the determination of manganese in blood and urine
  18. Evaluation of antiphospholipid antibody assays using latent class analysis to address the lack of a reference standard
  19. Evaluation of the hypochromic erythrocyte and reticulocyte hemoglobin content provided by the Sysmex XE-5000 analyzer in diagnosis of iron deficiency erythropoiesis
  20. Cancer Diagnosis
  21. Identifying risk in the use of tumor markers to improve patient safety
  22. Association between Echinococcus granulosus infection and cancer risk – a pilot study in Cyprus
  23. Dynamic change of the systemic immune inflammation index predicts the prognosis of patients with hepatocellular carcinoma after curative resection
  24. Aberrant methylation of tumour suppressor genes WT1, GATA5 and PAX5 in hepatocellular carcinoma
  25. Cardiovascular Diseases
  26. High homocysteine and low folate plasma concentrations are associated with cardiovascular events but not bleeding during warfarin treatment
  27. Hemolysis and Coagulation
  28. Hemolysis rates in blood samples: differences between blood collected by clinicians and nurses and the effect of phlebotomy training
  29. Letters to the Editor
  30. Harmonisation of the laboratory testing process: need for a coordinated approach
  31. Pseudohyperkalemia due to severe leukocytosis: case presentation
  32. When obtaining a blood sample from the right arm was not the right thing to do: a case of elevated parathyroid hormone levels 27 years after thyroidectomy
  33. Raising awareness of assay compatibility with heparinized plasma
  34. Improved protocol for extraction of genomic DNA from formalin-fixed paraffin-embedded tissue samples without the use of xylene
  35. Effect of refrigeration, centrifugation, acidification, heat treatment and storage on urine calcium, magnesium and phosphate
  36. Letter in response to: Identifying risk in the use of tumor markers to improve patient safety
  37. Letter to the Editor in reply to Dayyani and Morgenstern’s comment on the article “Identifying risk in the use of tumor markers to improve patient safety”
  38. Level of red cell distribution width is affected by various factors
  39. Red blood cell distribution: an index without additional cost in estimating the prognosis of acute pancreatitis
  40. Testing of total 25(OH)vitamin D: agreement and discrepant cases between Cobas® 8000 and Liaison® XL methods
  41. Expression profiling and ontology analysis of circulating long non-coding RNAs in septic acute kidney injury patients
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