Profile: Oral CDX Laboratories, Inc is a specialty anatomic pathology laboratory. Our Brush Test contains two components that require no anesthesia. The test causes no pain or minimal or no bleeding. It is a quick and painless method to test the common small white and red oral spots in the mouth & also used to determine a common oral spot containing abnormal cells known as dysplasia. The use of the oral brush biopsy is an accurate method for detecting precancers and cancers.