Williamsville Laboratory Services Plan Your Visit 5839 Main St Williamsville, NY 14221 Phone Number (716) 630-1558 (716) 630-1521 Get Directions Servicing Hours Hours Monday - Friday: 7:30 a.m. to 3:15 p.m. Saturday: 8 a.m. to 11:45 a.m. Appointment Hours Monday - Friday: 8 a.m. to 2 p.m. Services Blood Testing