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To mix or not to mix venous blood samples collected in vacuum tubes?
Linköping University, Department of Clinical and Experimental Medicine, Clinical Chemistry. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Clinical and Experimental Medicine, Clinical Chemistry. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Center for Diagnostics, Department of Clinical Chemistry.
2011 (English)In: Clinical Chemistry and Laboratory Medicine, ISSN 1434-6621, E-ISSN 1437-4331, Vol. 49, no 12, 2061-2063 p.Article in journal (Refereed) Published
Abstract [en]

Background: There are recommendations to mix venous blood samples by inverting the tubes immediately after venipuncture. Though mixing allows efficient anticoagulation in plasma tubes and fast initiation of coagulation in serum tubes, the effect on laboratory analyses and risk of haemolysis has not been thoroughly evaluated. less thanbrgreater than less thanbrgreater thanMethods: Venous blood samples were collected by venipuncture in vacuum tubes from 50 patients (10 or 20 patients in each group). Four types of tubes and 18 parameters used in routine clinical chemistry were evaluated. For each patient and tube, three types of mixing strategies were used: instant mixing, no mixing and 5 min of rest followed by mixing. less thanbrgreater than less thanbrgreater thanResults: Most analyses did not differ significantly in samples admitted to different mixing strategies. Plasma lactate dehydrogenase and haemolysis index showed a small but significant increase in samples omitted to instant mixing compared to samples without mixing. However, in one out of twenty non-mixed samples, activated partial thromboplastin time was seriously affected. less thanbrgreater than less thanbrgreater thanConclusions: These results indicate that mixing blood samples after venipuncture is not mandatory for all types of tubes. Instant mixing may introduce interference for those analyses susceptible to haemolysis. However, tubes with liquid-based citrate buffer for coagulation testing should be mixed to avoid clotting.

Place, publisher, year, edition, pages
Walter de Gruyter , 2011. Vol. 49, no 12, 2061-2063 p.
Keyword [en]
haemolysis, mixing, pre-analytical, venipuncture
National Category
Clinical Laboratory Medicine
Identifiers
URN: urn:nbn:se:liu:diva-75288DOI: 10.1515/CCLM.2011.705ISI: 000299856700019OAI: oai:DiVA.org:liu-75288DiVA: diva2:505904
Note

Funding Agencies|Faculty of Health and Sciences, Linkoping University, Sweden|LIO-19451|

Available from: 2012-02-27 Created: 2012-02-24 Last updated: 2017-06-28

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Landberg, Eva

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