What is the AC:blood ratio in the Black top tube?

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What is the AC:blood ratio in the Black top tube?

The Black top tube for ESR testing uses an acid citrate anticoagulant mixed with blood in a specific proportion to prevent clotting while preserving the sample’s properties for accurate sedimentation measurement. The calibration for this tube is 1 part anticoagulant to 4 parts blood, meaning the mixture contains enough anticoagulant to stop clotting but not so much that it excessively dilutes the sample and alters the ESR result. If there were more anticoagulant relative to blood, the dilution could skew the sedimentation rate; with too little anticoagulant, clotting could occur and invalidate the test. This 1:4 ratio is chosen to balance effective anticoagulation with maintaining the sample’s characteristics needed for Westergren ESR.

The Black top tube for ESR testing uses an acid citrate anticoagulant mixed with blood in a specific proportion to prevent clotting while preserving the sample’s properties for accurate sedimentation measurement. The calibration for this tube is 1 part anticoagulant to 4 parts blood, meaning the mixture contains enough anticoagulant to stop clotting but not so much that it excessively dilutes the sample and alters the ESR result. If there were more anticoagulant relative to blood, the dilution could skew the sedimentation rate; with too little anticoagulant, clotting could occur and invalidate the test. This 1:4 ratio is chosen to balance effective anticoagulation with maintaining the sample’s characteristics needed for Westergren ESR.

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