What are the three heparin formulations?

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Multiple Choice

What are the three heparin formulations?

The main idea is that heparin is used in labs in different salt forms, and the common formulations you’ll encounter are ammonium, sodium, and lithium heparin. These salts don’t change how heparin works—heparin's anticoagulant action comes from enhancing antithrombin III to inhibit thrombin and factor Xa—but the salt chosen affects solubility, stability, and how the plasma will interact with various assays. Sodium heparin is the workhorse for many routine plasma chemistries because it generally provides stable, compatible plasma. Lithium heparin is preferred in some situations where sodium would interfere with the test, and ammonium heparin is used in certain labs or older tubes. Calcium-containing, magnesium-containing, or potassium-containing heparin formulations aren’t standard because introducing additional divalent cations like calcium would counteract the anticoagulant effect or interfere with many assays, and these cations can alter test results.

The main idea is that heparin is used in labs in different salt forms, and the common formulations you’ll encounter are ammonium, sodium, and lithium heparin. These salts don’t change how heparin works—heparin's anticoagulant action comes from enhancing antithrombin III to inhibit thrombin and factor Xa—but the salt chosen affects solubility, stability, and how the plasma will interact with various assays. Sodium heparin is the workhorse for many routine plasma chemistries because it generally provides stable, compatible plasma. Lithium heparin is preferred in some situations where sodium would interfere with the test, and ammonium heparin is used in certain labs or older tubes.

Calcium-containing, magnesium-containing, or potassium-containing heparin formulations aren’t standard because introducing additional divalent cations like calcium would counteract the anticoagulant effect or interfere with many assays, and these cations can alter test results.

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