The document discusses the referral system in the Indian healthcare infrastructure. It defines referral as transferring cases beyond a facility's competence to a higher facility. Cases flow vertically from village to primary healthcare centers to community health centers and then to district hospitals. Bypassing levels is allowed for serious cases. The purposes are to provide comprehensive care, access to specialized services, and prevent overloading specialized facilities. Effective referral requires trained staff, continuing education, guidance, transportation, and mutual understanding between facilities. Nurses play a key role by observing patients, identifying needs, providing initial care, arranging transport, and following up.