Hematology Specimen Requirements & Interferences

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Last updated 11:37 PM on 6/20/26

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1

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What colour tube and anticoagulant is used for coagulation testing?

Blue top sodium citrate

2

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What is the ratio of anticoagulant to whole blood needed for coagulation?

1:9

3

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What happens to coagulation studies if HCT > 0.55?

PT and PTT will be falsely prolonged

4

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What is done if the HCT > 0,55 for coagulation studies?

Redraw with less citrate in the tube

5

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Which coagulation factors are heat labile?

V and VIII