Why is a light green top tube chosen for lithium heparin plasma tests?
A light green top tube containing lithium heparin is chosen for plasma tests because lithium heparin serves as an anticoagulant that prevents blood clotting, allowing the collection of plasma for various laboratory tests. The light green color of the tube helps to distinguish it from tubes with other anticoagulants or additives.
Here are the key reasons why a light green top tube with lithium heparin is selected for plasma tests:
Anticoagulant Action:
Lithium heparin acts as an anticoagulant by enhancing the activity of antithrombin III, which inhibits several coagulation factors. This prevents blood clotting and allows the collection of liquid plasma.
Preservation of Plasma:
The primary purpose of using lithium heparin is to preserve the plasma fraction of the blood sample. This is important for tests that require plasma, such as chemistry panels, enzyme assays, and other plasma-based analyses.
Compatibility with Chemistry Tests:
Lithium heparin is suitable for a wide range of chemistry tests, including liver function tests (e.g., ALT, AST), kidney function tests (e.g., creatinine), electrolyte panels, and other biochemical assays.
Stability of Analytes:
Lithium heparin helps maintain the stability of various analytes in the plasma, allowing for accurate and reliable test results. This is particularly important for tests that are sensitive to clotting or changes in the blood sample.
Convenience for Automated Systems:
The use of lithium heparin in a light green top tube is convenient for automated laboratory systems. These tubes are often compatible with automated analyzers, facilitating high-throughput testing.
Ease of Identification:
The light green color of the tube makes it easily distinguishable from tubes with other anticoagulants or additives, helping healthcare professionals and laboratory staff quickly identify the appropriate tube for plasma testing.
It's important to note that while light green top tubes with lithium heparin are suitable for a broad range of plasma tests, specific tests may have unique requirements, and healthcare professionals should follow laboratory guidelines for proper sample collection and handling. Additionally, different tube colors may be used for other types of tests, such as those requiring serum or whole blood samples. Always follow the guidelines provided by the laboratory or healthcare provider for accurate and reliable test results.
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