Client Services Center Phone: (800) 444-9111 Hours of Operation: Monday-Friday 7:00 a.m. - 9:00 p.m. CST Saturday 8:00 a.m. - 5:00 p.m. CST

Specimen Pick Up & Couriers Phone: (800) 444-9111 Fax: (512) 225-1261 Hours of Operation: Monday-Friday 8:30 a.m. - 6:00 p.m. CST Saturday 8:00 a.m. - 5:00 p.m. CST

Central Billing Services Client Billing Phone: (800) 343-4407 Patient Billing Phone: (800) 845-6167 Hours of Operation: Monday - Thursday 7:00 a.m. - 5:00 p.m. CST Friday 7:00 a.m. - 4:00 p.m. CST

Employment Phone: (800) 444-9111 Fax: (512) 225-1251 Email: jobs@esoterix.com Hours of Operation: Monday - Friday 8:30 - 5:30 CST