The light blue top tube contains which anticoagulant at what concentration?

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The light blue top tube contains which anticoagulant at what concentration?

Light blue top tubes are used for coagulation testing and contain sodium citrate as the anticoagulant. The standard concentration is 3.2% sodium citrate, which binds calcium to prevent clotting while preserving the clotting factors for accurate PT/INR and aPTT results. The 3.2% concentration is important because it provides the correct blood-to-anticoagulant ratio (about 9:1); higher concentrations, like 3.8%, would bind more calcium and can artificially prolong clotting times. Other anticoagulants (such as lithium heparin in green-topped tubes or oxalate in gray-topped tubes) are used for different tests, not routine coagulation studies.

Light blue top tubes are used for coagulation testing and contain sodium citrate as the anticoagulant. The standard concentration is 3.2% sodium citrate, which binds calcium to prevent clotting while preserving the clotting factors for accurate PT/INR and aPTT results. The 3.2% concentration is important because it provides the correct blood-to-anticoagulant ratio (about 9:1); higher concentrations, like 3.8%, would bind more calcium and can artificially prolong clotting times. Other anticoagulants (such as lithium heparin in green-topped tubes or oxalate in gray-topped tubes) are used for different tests, not routine coagulation studies.

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