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Random variation and systematic error caused by various preanalytical variables, estimated by linear mixed-effects models.
MedLine Citation:
PMID:  23117035     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: We wanted to determine whether specific, preanalytical sample handling increases preanalytical variation and bias test results compared with optimal handling. METHODS: Blood was collected into 4 serum-separation tubes from each arm of 60 outpatients. In 30 of the patients, half of the tubes were transported in the pneumatic tube system, while the other half were manually delivered. In the remaining patients, the blood samples were collected using 21-gauge straight needles (green needles) and 23-gauge butterfly needles. Half of the tubes were mixed by inverting 5-6 times, and the other half by one inversion. Linear mixed-effects models were used as statistical method. RESULTS: Transporting samples in the pneumatic tube system caused a significant bias to the results for LD (4.5 U/L, P<0.001) and magnesium (0.0021mmol/L, P=0.003). For CK and glucose, the preanalytical variation was significantly higher for samples transported in the pneumatic tube system vs manual delivery. Using butterfly needles resulted in lower values (P<0.05) for calcium (-0.0072mmol/L), CK (-0.75 U/L) and LD (-1.6 U/L) compared with 21-gauge needles. The preanalytical variation for ALP was significantly higher with butterfly needles. CONCLUSIONS: The specific sample handling had significant but small random and systematic effects on results for some analytes.
Authors:
Marit Sverresdotter Sylte; Tore Wentzel-Larsen; Bjørn J Bolann
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-29
Journal Detail:
Title:  Clinica chimica acta; international journal of clinical chemistry     Volume:  -     ISSN:  1873-3492     ISO Abbreviation:  Clin. Chim. Acta     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-11-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1302422     Medline TA:  Clin Chim Acta     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
Affiliation:
Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway. Electronic address: marit.sverresdotter.sylte@helse-bergen.no.
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