During the capillary blood gas collection process, what is the purpose of the metal "flea?"

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The page below is a sample from the LabCE course Pre-analytical Challenges Encountered with Capillary Blood Collection and Testing. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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During the capillary blood gas collection process, what is the purpose of the metal "flea?"

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