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  • MDLB 1321
    ORDER OF DRAW

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EDTA TUBE

SPECIMEN

WHOLE BLOOD FOR HEMATOLOGY
CENTRIFUGE FOR TRANSFUSION SERVICES

DEPARTMENT

HEMATOLOGY
TRANSFUSION SERVICES

COMMON TESTS

CBC – TEST WITHIN 6 HOURS PREFERABLY OR <24 HOURS.
ESR – CAN HAVE SPECIALLY SHAPED TUBE
TYPE & SCREEN
CROSSMATCH

REASON FOR ORDER

Responsible for more carry-over problems than any other additive.

HOW IT WORKS

Removes calcium by binding or chelating so that blood cannot clot.
Preserves blood cell morphology.
Inhibits platelet aggregation.

Mixing

MIXING

Must be mixed immediately after collection to prevent platelet clumps and micro clots.
8–10 inversions recommended.

SPECIAL CONSIDERATIONS

Spray dried EDTA is preferred.
Liquid EDTA can cause dilution so filling tube is important.