Clinical Diagnostic Laboratories receives positive feedback for its polite, professional, and helpful staff at its Ashburn VA location. The phlebotomists are skilled, and the personalized service and care quality are typically good. Results are provided via email. Some issues noted include occasional incomplete lab work and a problem with the Google Maps listing for the Ashburn office, which directs customers incorrectly. Patients advise verifying location details and ensuring all form information is accurate during visits.