The action you should take is to fill the tube halfway.
Venipuncture is a procedure performed by a trained medical personnel (phlebotomist) who uses needle to take blood from the vein for diagnostic purposes.
The blood collected chart is an information that states the correct specimen collection technique for each disease condition.
From the instructions given, the blood collected chart states that you should collect 2ml.
But 4ml gray tubes is only available.
Therefore, the blood is collected till the tube is half filled which will give a total of 2ml that was stated in the blood collected chart
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