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- Packed Cell Volume
Evaluate anemia, blood loss, and state of hydration or suspect polycythemic condition and response to treatment
Automated cell counter
Tube fill capacity
0.5 mL (500 μL for pediatric microtainer capillary tubes; fill tube to capacity.)
Lavender-top (EDTA) tube
Invert tube 8 to 10 times immediately after tube is filled at the time of collection.
Maintain specimen at room temperature.
Causes for Rejection
Hemolysis; clotted specimen; specimen diluted or contaminated with IV fluid; specimen drawn in any anticoagulant other than EDTA; tube not filled with minimum volume; specimen received with plasma removed; improper labeling; transport tubes with whole blood
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