Yes, it is generally possible to make changes to your appointment at Quest Diagnostics - NY, NJ. Customers often have the option to reschedule or modify their appointments through the official website or by using the patient portal. The online system usually provides an easy and convenient way to view your existing appointments and make adjustments as necessary. Additionally, changes can often be made by calling the location where the appointment is scheduled, if direct communication is preferred. However, it is important to note that specific policies regarding appointment changes may vary by location or service type. For the most accurate information, it is advisable to check the current webpage or the patient portal for guidance on making changes to appointments or on how to contact the laboratory for assistance.