When multiple blood tubes are collected, the assistant should be aware that tube collection order (order of draw) matters primarily to
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Medical Office Assistant · Clinical Laboratory Technology and Diagnostics
Order of Draw
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The order of draw for blood tubes is designed primarily to
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When blood cultures are ordered along with other blood tubes, the blood culture bottles are generally collected
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When several blood tubes with different additives are required for one patient, the assistant should understand that the tubes are drawn in a specific order to
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When multiple tubes must be collected from one patient, the 'order of draw' refers to
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Study tools & related lessonsYou’ll learn to · Related
You’ll learn to
- Describe the purpose of the order of draw and why the collection sequence prevents additive cross-contamination.
- Identify common blood collection tube colors and the additive contained in each.
- Explain why the order of draw matters for accurate coagulation, chemistry, hematology, and glucose results.
- Apply safe blood-collection practices, including personal protective equipment, sharps disposal, labeling, and patient identification.
- Recognize the assistant's supervised, policy-following role and escalate uncertainties, errors, refusals, and recollections to licensed staff.
Sources & references
- Centers for Disease Control and Prevention — Laboratory Quality
- Occupational Safety and Health Administration — Bloodborne Pathogens
- U.S. National Library of Medicine — MedlinePlus
This lesson was adapted from the open educational references above; their licenses and attributions are preserved. See Copyright & Licensing.
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