FirstCall Urgent Care works with Portal Gateway to ensure patients receive high-quality & confidential care in Laurel, Columbia, Fulton, Clarksville & Dayton MD ... Skip to content. Notice: COVID-19 Testing and FAQs now available for FirstCall Medical Center patients. LOCATIONS NEAR YOU: 8:00 am – 10:00 pm . FIND YOUR LOCATION (410) 730-3399 ....