Located in The Shops at Potomac Valley on Darnestown Road, MedStar Health Urgent Care in Gaithersburg at Darnestown Road is open 7 days a week with extended hours. Walk-in visits are always welcome, but an online check-in is recommended. Providing care for acute illness and injury to people of all ages. We offer laboratory services on-site for faster diagnosis and treatment. We can provide care that is beyond the scope or availability of the typical primary care practice or retail clinic.