McALLEN - Vitalant, formerly United Blood Services, is in desperate need of blood donations. It has established two ways to donate blood. Listed below are the locations and procedures they have established: 1. The Vitalant Center in 1. The Vitalant Center in McAllen, located at 1400 S. 6th St., is open. - They prefer appointments but are accepting walk-ins. Most people showing up are walk-ins. Contact number is (956) Contact number is (956) 213-7500. - Donors are to check-in at the window. - Donors will be screened via temperature and questionnaire. - In order to avoid mass gatherings, donors are told to wait in their vehicles and ...