Quest Diagnostics offers COVID-19 antibody testing by appointment, along with routine blood and urine testing, pediatric services, and wellness programs. The location is in the Diamond Bar Professional Center. Appointments can be scheduled online, where tips for test preparation are available. Experiences vary. Many reviews describe a prompt, efficient, and quick process, with appointments allowing patients to be in and out within 10 to 15 minutes. The phlebotomists are frequently noted as professional, friendly, courteous, and good, handling patients with care. The appointment reminder system is effective and check-in is easy. However, the facility itself receives criticism for being small and depressing, with a small waiting room and no receptionist to assist, which can be difficult for some patients. There is also a noted issue with walk-in patients causing long waits, leading to suggestions for better management of the walk-in policy.
Brused arm has never happened before. New Phleb. Remodel is nice. Restroom ledge on floor is a trip hazard.
January 2026
I helped my neighbor go to Quest today, and it was a very smooth experience. We had a pretty complicated question involving various doctors orders and had trouble finding a suitable vein, but our technician Daniela handled everything smoothly and was very polite.
October 2025
This is place is not far at all, place is always clean. Time of taking you in is quick. The lab tech was friendly, quick and very informative.
