---
title: Add limits on health check intervals
summary: null
url: >-
  https://www.fastly.com/documentation/reference/changes/2025/09/health-check-limits
---

We've clarified the valid range for the `check_interval` parameter in the [Health check](https://www.fastly.com/documentation/reference/api/services/healthcheck/) endpoint. Values must be between 1 second and 1 hour.