Due to COVID-19, hours may vary. Please call ahead to verify hours. Monday thru Thursday 7am to 5pm. To reach Dr. Mackler after hours, call 302-629-6611. For emergencies, please go to the nearest Emergency Room. Patient Forms. Seaford Endoscopy Center Brochure. Patient Portal Brochure.Online Bill Pay‧Insurances Accepted‧Contact Us‧News‧Billing & Benefits‧Schedule Your Colonoscopy.