Quest Diagnostics offers a variety of lab testing services, including COVID-19 antibody testing by appointment. Located in the Mountain View Medical Center plaza, they provide routine lab tests such as blood and urine testing, glucose tolerance tests, and pediatric specialty services. Patients appreciate the efficient appointment scheduling and online check-in, which help streamline the process. While some walk-in patients have reported long wait times, especially when they arrive without an appointment, the staff is generally praised for their professionalism and expertise. Many customers have noted that the blood draw experience is smooth, with minimal pain, and they often receive their results quickly through the Quest Diagnostics app. However, there are concerns regarding the billing process, as some patients have experienced discrepancies with copays and unpaid balances, emphasizing the importance of keeping receipts. Overall, many reviews highlight the friendly and helpful nature of the staff, as well as the clean and calming environment of the waiting room. Despite some issues with wait times for walk-ins, most customers are satisfied with the quality of service and recommend Quest Diagnostics for their lab testing needs.