Flashback blood collection needle working safty

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How a flashback bills collection needle can not be ready used (technogy ). Who blood will be block the flashback chamber window after removing a needle from vein. Please explain in detail the process of patience safety in new technology needles like flackback blood collection needle or vaccutainer needles.

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Let me guess.. A school assignment?

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Specializes in PICU, Sedation/Radiology, PACU.

When using a new needle, what does th flashback of blood indicate? Why might it be a problem if the ability to see a flashback was compromised?

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