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Platelet Count
Test Code723X
CPT Codes
85049
Preferred Specimen
5 mL whole blood collected in an EDTA (lavender-top) tube
Minimum Volume
1 mL
Other Acceptable Specimens
Whole blood from full EDTA (tan-top) tube
Instructions
Maintain specimen at room temperature. Do not refrigerate. If multiple draw, collect EDTA (lavender-top) tube last. Traumatic draw can introduce thromboplastin and trap WBC and platelets. Refrigeration can precipitate fibrin and trap WBC and platelets.
Note: If drawn with lead testing, EDTA (tan-top) is required.
Note: If drawn with lead testing, EDTA (tan-top) is required.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 48 Hours
Refrigerated: Unacceptable
Frozen: Unacceptable
Refrigerated: Unacceptable
Frozen: Unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Clotted
Methodology
Electronic Cell Sizing/Counting/Cytometry/Microscopy
Setup Schedule
Set up: Mon-Sat; Report available: 1-3 days
Clinical Significance
Platelets must be present in adequate numbers and have proper function to aid in hemostasis.
