Abstract
Numerous preanalytical variables may affect the outcome of clinical laboratory tests (1)(2)(3). Blood-collection procedures are considered an important impact factor because they are associated with several possible sampling problems, including the use of a tourniquet with hand-clenching, the site of venipuncture, hemolysis because of venipuncture, and the inappropriate use of sample tubes. In our hospital, two systems are used for venous blood collection: the Becton Dickinson (BD) VacutainerTM system and the Greiner Vacuette® system (Greiner Labortechnik GmbH). The BD product includes a specific blood-collection needle, a holder into which the needle is assembled before phlebotomy, and evacuated blood collection tubes. The Greiner product consists of a sterile holder (Holdex®) with a luer adapter to fit regular needles and evacuated blood collection tubes. The design of the BD needle holder enables direct linear flow of blood from the venipuncture site into the blood collection tubes. The Greiner Holdex was designed with an offset luer adapter to enable a convenient puncture angle. Therefore, the straight path within the Holdex is interrupted twice by angles of 90°, thus forming three consecutive flow segments. These changes in the linear flow of blood might …
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