How do primary care, secondary care, and tertiary care differ in regional health systems?

Health systems are often organized as a pyramidal structure based on increasing levels of specialization, technical sophistication, and cost.1

• Primary health care: This is the first point of contact for patients within the health system. It is typically provided by general practitioners, pediatricians, or nurses who manage the vast majority of health needs.12
• Secondary health care: This tier consists of referral services provided by specialists or facilities, such as local or regional hospitals. Patients are directed here by primary care providers when they require specialized knowledge, diagnostic testing, or treatments beyond the scope of primary care.13
• Tertiary health care: This represents the most specialized level of care. It involves complex procedures and treatments performed by specialists in advanced facilities, such as teaching or university hospitals, often catering to specific patient groups like those with mental disorders or complex medical conditions.14

Regional health systems coordinate these tiers to ensure efficient resource allocation, though the specific administrative approach varies by country, ranging from centralized government-run networks to more decentralized or private models.5