6 Health Systems and Public Health
Learn how health systems organize services and resources, finance care, connect clinical practice with public health, and assess performance and equity.
What makes up a
A includes the organizations, people, resources, and actions whose main purpose is to promote, restore, or maintain health. It extends beyond hospitals and clinicians to include public health agencies, community organizations, laboratories, insurers, regulators, and policies that shape health.
Health systems differ among countries, but all must organize services, mobilize and allocate resources, deliver care, and assess whether they are meeting people’s needs.
The six connected building blocks
The World Health Organization framework describes six connected components, or building blocks:
sets priorities, makes policy, regulates organizations and products, and oversees accountability.
organizes preventive, diagnostic, treatment, rehabilitative, and palliative services.
includes clinical, public health, administrative, and support workers.
collect and use information for patient care, population monitoring, planning, and evaluation.
include medicines, vaccines, diagnostics, equipment, and relevant technologies.
raises, pools, and allocates money for health services.
These components depend on one another. For example, a clinic cannot reliably provide vaccinations without trained staff, a vaccine supply, financing, and records that help identify who needs a dose.
Governance, ownership, and levels of care
Health systems vary in who governs and owns services. National, regional, and local governments may set policies or operate public services; private nonprofit and for-profit organizations may also provide care or insurance.
Services are often arranged in levels. Community and primary care handle many first-contact and ongoing needs, while specialist and hospital services provide more complex care. Effective organization supports coordination across these levels so patients can move between services without losing continuity of care.
How health care is financed
has three core functions:
Revenue raising: Collecting money through sources such as taxes, mandatory or voluntary insurance contributions, direct patient payments, or external aid.
: Combining prepaid funds so costs can be shared across people and over time. This helps protect individuals from having to pay the full cost of illness when care is needed.
Purchasing: Using pooled funds to pay providers for services. Arrangements may include salaries, budgets, fee-for-service payments, or payments for a defined population. Their design can influence which services are offered and how providers coordinate care.
Financing choices affect access, fairness, and care quality. If a person must pay the full cost of a visit at the point of care, cost may prevent timely treatment. Prepaid, pooled funds can reduce this barrier, but coverage also depends on which services are included and whether they are actually available.
is the goal that everyone can obtain the quality health services they need without financial hardship. It is a goal, not a single financing model.
Delivering care and public health services
include checkups, vaccination, diagnosis, and treatment. include disease surveillance, health education, outbreak investigation, and environmental hazard control. These functions overlap: primary care can identify and treat a patient with a communicable disease, while public health teams investigate cases, monitor spread, and coordinate prevention across the community.
Strong delivery systems aim for care that is accessible, timely, safe, effective, coordinated, and responsive to people’s needs. is particularly important because it connects first-contact clinical care with prevention, health promotion, community engagement, and referral to more specialized services.
Services may be inaccessible even when a program formally exists. Barriers include distance, cost, limited clinic hours, language access, and workforce shortages.
Assessing health-system performance
Performance assessment asks whether system resources and activities lead to services and that meet population needs. A common approach considers three aspects:
: The resources and arrangements available, such as facilities, staffing, medicines, funding, and information systems.
: What the system does, such as appointment timeliness, provision of recommended preventive care, referral completion, and infection-control practices.
: Results such as improved health, fewer avoidable complications, patient experience, or protection from financial hardship.
No single measure gives a complete picture. Useful indicators include service availability and use, quality and safety, health , costs, and financial protection. The WHO’s UHC monitoring framework tracks both essential-service coverage and financial hardship from out-of-pocket health spending.
Measures should be examined across population groups, such as by income, age, location, or other relevant characteristics. An overall average can conceal gaps in access or .
Using assessment to improve services
Assessment supports improvement when findings are used to identify a problem, select a response, and check whether that response worked. For example, if vaccination records show low coverage in a neighborhood, the system can investigate whether the cause is limited clinic hours, lack of transportation, or missed outreach. It can then evaluate whether extended hours or mobile clinics improve coverage.
How clinical care and public health work together
Clinical care primarily meets the needs of individuals, while public health works to protect and improve health across communities and populations. The two have complementary roles and share information, workforce, facilities, and prevention responsibilities.
Public health surveillance can identify emerging risks and guide clinical preparedness. Clinics can report cases, deliver immunizations, and connect patients to community resources. The describe community-wide activities that include monitoring population health, investigating hazards, communicating health information, building partnerships, developing policy, assuring equitable access to care, and evaluating public health efforts.
These activities depend on a functioning . Public health also strengthens the system by identifying population needs and preventing avoidable illness. Together, clinical care and public health can support more equitable care and connect individual services with broader efforts to improve health.