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Home
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MDLB 1321
ORDER OF DRAW
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Culture
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SPS
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Lt. Blue
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Red
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SST
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PST
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Green
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Lavender
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Grey
SODIUM CITRATE
SPECIMEN
CENTRIFUGE FOR PLASMA
DEPARTMENT
COAGULATION SECTION OF HEMATOLOGY
COMMON TESTS
COAGULATION TESTS: PT/PTT
PT/PTT – Test within 4 hours
preferably, or < 24 hours
REASON FOR ORDER
Before all other additive tubes because all other additives affect coagulation.
HOW IT WORKS
Removes calcium by binding or chelating so blood cannot clot.
Best for preserving clotting factors.
Mixing
Requires immediate mixing.
3–4 gentle inversions.
SPECIAL CONSIDERATIONS
1 : 9 ratio of blood to anticoagulant.
