To make an appointment, please call (661) 471-4400 Monday - Friday 8:00 a.m. - 4:30 p.m. or self-schedule in the MyWellness Patient Portal found here. For more information, click here www.vaccinatelacounty.com or call 211. Antelope Valley Health Center (AVHC), located in east Lancaster, provides primary care services for adults and children..