High-sensitivity troponin tests measure the same protein in the blood as the standard test but at much lower levels. Because these new generation of tests are more sensitive than standard ones, they become positive sooner and may help detect acute coronary syndrome earlier. The hs-troponin test may also be positive in people with stable angina and even in people with no symptoms. In these cases, a positive test indicates an increased risk of future heart events such as heart attacks. Hs-troponin is not approved in the . at this time, but research is ongoing and it may become available soon. It is already routinely used in Europe, Canada, and other countries as well.