Hearing & Audiology serving Lehigh Valley. Rated 2/5 (1 reviews). From their website: This directory provides the locations and times for common diagnostic testing and imaging services at Lehigh Valley Health Network. The listing indicates whether appointments are required, or if walk-in service is available. For most tests, the hours provided show the latest time an appointment can be made. Hours are subject to change. Follow the links to learn more about each test.