Corewell Health Ludington Hospital Laboratory provides a wide variety of testing services and operates. When your doctor or one of our emergency physicians requests a blood test or other test critical to your good health, the staff of Laboratory Services is there to provide the services you need. CLOSED on the following holidays: New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. Holidays that fall on a Sunday will be observed on the following Monday. Employee Drug Screen testing available Monday - Friday from 8 a.m. to 4:30 p.m.