Which of the following is an example of preventive service?

Preventive services are designed to detect potential health issues before they become serious problems or to maintain overall health and wellness. Routine check-ups and vaccinations are key examples of preventive services because they proactively address health care needs.

During a routine check-up, health care providers assess an individual's overall health status and identify any necessary preventive measures, such as vaccinations that help protect against common diseases. These services can catch health concerns early and provide necessary interventions before conditions worsen, which is essential for maintaining health and preventing more serious medical issues down the line.

In contrast, the other examples reflect actions taken in response to existing health concerns or emergencies. An emergency room visit occurs in response to acute illness or injury, surgery addresses an already existing condition, and medication for chronic illness also deals with ongoing health issues rather than promoting preventive care. These actions are crucial but fall under the category of treatment rather than prevention.