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Venipuncture

QuestionAnswer
What is the "order of draw"? It refers to the specific sequence in which blood collection tubes are filled during venipuncture.
Why is following the order of draw important? To prevent cross-contamination of additives that can alter lab test results.
What is the purpose of blood culture tubes (yellow or yellow-black top)? To detect bacterial or fungal infections in the blood.
Why are blood culture tubes drawn first? To avoid contamination from additives that could inhibit microbial growth.
What is the purpose of coagulation tubes (light blue top)? Used for coagulation studies like PT and aPTT.
What additive is in the light blue top tube? Sodium citrate.
Why is the light blue top tube drawn second? To avoid interference with coagulation tests from other additives.
What is the purpose of serum tubes (red, gold, or tiger top)? Used for chemistry, serology, and immunology tests.
What additives are in gold/tiger top tubes? Clot activator and serum separator gel.
Why are serum tubes drawn third? They lack anticoagulants that could interfere with prior tubes.
What is the purpose of heparin tubes (green top)? Used for plasma chemistry tests and blood gas analysis.
What additive is found in green top tubes? Lithium or sodium heparin.
Why are heparin tubes drawn fourth? Heparin can affect coagulation and serum tests if drawn earlier.
What is the purpose of EDTA tubes (lavender or purple top)? Used for hematology tests such as CBC.
What additive is in EDTA tubes? Ethylenediaminetetraacetic acid (EDTA).
Why are EDTA tubes drawn fifth? EDTA has strong anticoagulant effects that can interfere with other tests.
What is the purpose of oxalate/fluoride tubes (gray top)? Used for glucose and lactate testing.
What are the additives in gray top tubes? Potassium oxalate and sodium fluoride.
Why are gray top tubes drawn sixth? To preserve glucose levels without interference from prior tube additives.
What are some examples of "other tubes" drawn last? Royal blue, tan, yellow-top ACD tubes.
Why are specialized tubes drawn last? To prevent contamination that could interfere with their specific test purposes.
Created by: daniellefm116
 

 



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