Some cultures are live and/or involve active elements which, over time, can slightly or drastically (depending on the specimen collected and the amount of time) undergo changes due to chemical reactions, natural occurrences, and other variables. Furthermore, some specimens The Order of Draw method is used in order to test cultures in a manner that reduces the chance of contamination as it establishes practices that are based on knowledge of different cultures and their associated hazards, reactions, etc.
The proper order of draw for a syringe method is: Blood culture tubes Coagulation tubes Serum tubes Heparin tubes EDTA tubes Glycolysis inhibitor tubes
For a PTT lab draw, a light blue top tube is typically used. This tube contains sodium citrate as an anticoagulant to prevent blood clotting during the test.
The recommended order of draw for these tests is as follows: CBC (Complete Blood Count) Electrolytes Creatinine Prothrombin Time (Protime)
If a lavender tube is collected before a light green tube, it should not affect the quality of the samples. However, the order of draw is important to prevent contamination, so it's best to follow the recommended order for blood tube collection to ensure accurate test results.
The tube top used for a glucose draw is typically gray. This tube contains sodium fluoride as a preservative and potassium oxalate as an anticoagulant to prevent the breakdown of glucose in the sample.
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If you collect a wrong order of draw, you should stop the blood collection process immediately to prevent contamination and inaccurate test results. Discard the improperly collected samples and inform the healthcare provider or lab personnel about the error. Then, follow the proper protocol to collect the samples again in the correct order. It's important to document the error for quality assurance purposes.