ESR tube is typically a black-top tube. It contains a chemical called sodium citrate that is used to preserve the blood sample and prevent coagulation.
The black color of the tube is used to distinguish it from other types of tubes and to help prevent mix-ups in the laboratory.
An ESR tube, also known as an erythrocyte sedimentation rate tube, is a type of tube used in a laboratory test called the erythrocyte sedimentation rate (ESR) test. Containing 3.2% sodium citrate solution for anticoagulation, the ratio of anticoagulant to blood is 1:4. The ESR test measures the rate at which red blood cells sediment in a blood tube and is used to help diagnose and monitor certain conditions, including inflammation, infection, and cancer.
It's important to note that the color of the ESR tube may vary depending on the specific laboratory and the equipment being used. Some labs may use other tubes, such as a plain tube or a tube with a different colored top. It's always important to follow the laboratory's specific instructions and use the correct type of tube as specified.
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