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Light Blue.

The additive in these tubes is usually Na+ Citrate and there is a marking on the test tube to indicate the minimum fill. Blood must come at least up to the line or it will not be acceptable.

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βˆ™ 8y ago
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βˆ™ 3mo ago

For coagulation tests, typically a light blue top tube is used, which contains sodium citrate as an anticoagulant. The sodium citrate preserves the blood sample by binding to calcium, preventing it from clotting during testing.

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Q: What color tube do you use for coagulation test?
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