In 388 outpatients, to determine the probability of K-EDTA cross-contamination, blood was drawn sequentially into a serum tube, followed by a tube containing K-EDTA, and by another serum tube. The study was also carried out to examine the effect of order of draw on potassium results, regardless of K-EDTA contamination. This study was aimed to investigate the potassium ethylenediaminetetraacetic acid (K-EDTA) contamination in blood samples taken after a tube containing the additive during routine workflow. However, requirement of this procedure is still debatable. Alternatively, in order to use it as an evacuated tube, the plunger can be pulled and locked before venipuncture leaving a vacuum stainless-steel hollow shaft with a concentric hole on the bev- el end B) a winged needle or "butterfly" has a pair of winglets attached at the base of the shaft, that fold for handling or lay flat for stabilization, and a connection tubing which carries the blood to the collecting tube C) the dispensing needle, which is fixed into the inner side of tube holder, pierces the rubber stop of the tube allowing the blood to be drawn D) the Sarstedt's hybrid system has a collecting tube with a plunger that can be used to withdrawn the blood during venipuncture or pulled before to evacuate the tube.Ī specific sequence is recommended for filling blood tubes during blood collection to prevent erroneous test results due to carryover of additives. In such a device the collecting tube has a plunger which can be pulled during venipuncture to withdraw blood as in a typical sy- ringe ( Figure 1D). for the collecting devices, it is note- worthy to mention a third kind represented by the hybrid collecting system introduced by Sarstedt in 1975 and distributed under the trade name of S- Monovette TM (14).
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