360 patients who are on dabigatran, apixaban and rivaroxaban based on the above inclusion and exclusion criteria will be recruited. After the informed consent, the patient will be needed for blood taking before and 2 hours after the medication (NOAC). The patient's demographic data and medical history will also be retreived from Central Medical Syetem too.
This study is aimed to establish reference intervals of NOAC (dabigatran, apixaban and rivaroxaban) in ethnic Chinese patients.