What types of tests are used to monitor heparin levels?
The types of tests used to monitor heparin levels include the activated partial thromboplastin time (aPTT), the prothrombin time (PT), the thrombin time (TT), and the anti-Xa assay. The aPTT is the most commonly used test since it is the most sensitive to heparin levels. Other tests such as the PT, TT, and anti-Xa assay are more specific for heparin levels, but are not as sensitive. Additionally, the use of reagents and instruments can affect the results of the aPTT, so it is important to use the correct reagents and instruments when performing the test. 