Practices can shape their demand by limiting the types of services and procedures they are prepared to offer patients. For example, a primary care practice with greater demand than supply may decide to send patients needing blood draws or other simple diagnostic tests (that had traditionally been done in the office) to a lab or phlebotomy service. Physicians (in partnership with specialists) may also begin referring patients for simple procedures, such as removing skin lesions, to a dermatologist rather than provide that level of treatment themselves.