The Newton-Wellesley Hospital Blood Draw Lab - Walpole is open to Mass General Brigham patients with an open laboratory order from their Mass General Brigham provider. No appointment is necessary, walk-in appointments are available. Walk-in appointments are welcome Monday through Friday from 7:30 am to 3:45 pm. Closed for lunch 12:00 -12:45 pm. Closed on holidays. Children 3 years old and older may receive this service.