Original scientific paper

https://doi.org/10.11613/BM.2018.010707

Preanalytics of urine sediment examination: effect of relative centrifugal force, tube type, volume of sample and supernatant removal

Amalija Bunjevac orcid.org/0000-0002-1946-6367 ; Department of laboratory diagnostics, Children’s hospital Zagreb, Zagreb, Croatia; Department of Clinical Chemistry, Sestre milosrdnice University Hospital Center, Zagreb, Croatia
Nora Nikolac Gabaj orcid.org/0000-0001-6831-6309 ; Department of Clinical Chemistry, Sestre milosrdnice University Hospital Center, Zagreb, Croatia
Marijana Miler orcid.org/0000-0002-0569-924X ; Department of Clinical Chemistry, Sestre milosrdnice University Hospital Center, Zagreb, Croatia
Anita Horvat ; Department of Clinical Chemistry, Sestre milosrdnice University Hospital Center, Zagreb, Croatia

Abstract

Introduction: Laboratories often modify procedures recommended by the European Urinalysis Guidelines for urine sediment analysis. The aim of
this study was to compare the recommended protocol with our routine laboratory procedure and to evaluate the possible impact of modifications in
the relative centrifugal force, type of tube, method of supernatant aspiration and urine volume on patient’s results.
Material and methods: Firstly, relative centrifugal force was investigated using 20 pairs of samples examined after centrifugation at 400xg and
1358xg. In phase two, 110 samples were examined, paired as: round bottom vs conical tube (N = 46), decanting vs suction of supernatant (N = 100)
and 10 mL vs 5 mL of urine sample (N = 101).
Results: The number of erythrocytes, leukocytes and squamous epithelial cells was significantly lower after centrifugation at 400xg (P = 0.001,
0.002 and 0.004, respectively). The number of leukocytes was significantly lower in conical tubes (P = 0.010), after the suction of supernatant (P =
0.045) and in 5 mL urine (P < 0.001). The number of squamous epithelial cells was significantly lower after the suction of supernatant (P < 0.001)
and in 5 mL urine (P < 0.001). The number of erythrocytes (P < 0.001), total non-hyaline casts (P < 0.001) and the frequency of granular casts (P =
0.039) was significantly lower in 5 mL urine.
Conclusion: Lower results of leukocytes, erythrocytes, squamous cells and non-hyaline casts were recorded in recommended procedures (centrifugation
at 400xg, suction of supernatant, conical tube, 5 mL of sample) than in routine procedure (centrifugation at 1358xg, decanting of supernatant,
round bottom tube, 10 mL) used in our laboratory.

Keywords

preanalytical phase; laboratory error; urinalysis; urine sediment

Hrčak ID:

192386

URI

https://hrcak.srce.hr/192386

Publication date:

15.2.2018.

Visits: 1.598 *