LifeStream will conduct a community blood drive today, April 21, in the Helen Gray Center at Hi-Desert Medical Center, from 10 to 2. Donors will receive incentives. In addition, Desert Blood Services now offers donors free cholesterol screening with every blood donation. All prospective donors should be free of infections or illness, weigh at least 110 pounds, and not be at risk for AIDS or hepatitis. To make an appointment to donate blood, call 800-TRY-GIVING.