Hemolysis can be caused by rough handling of a blood sample, by allowing the tourniquet to run too long (causing blood congestion), or by squeezing the fingertip too much during capillary collection, dilution, exposure to contaminants, extreme temperatures, or pathological conditions. To ensure accurate test results, all tubes containing an anticoagulant or preservative must be completely filled. This results in a shift of fluid between the vein and surrounding tissue. Specific requirements can be found in the individual test directories.
Which color tube is used for the CBC test?
Since additives are not interchangeable, it is necessary to consult the sample requirements section of the individual test descriptions to determine the appropriate collection requirements for the ordered test. As hemolysis affects many procedures, please submit samples that are as free of hemolysis as possible. Do not use gel barrier tubes to submit samples for therapeutic drug monitoring, direct Coombs, blood type, and blood groups. Always use the correct vacuum tube for tests that require a specific anticoagulant (such as EDTA, heparin, sodium citrate, etc.) or preservative.
Plasma is obtained from blood that has been mixed with an anticoagulant in a collection tube and is therefore not coagulated.
Can I use the pink top tube for CBC?