This image shows the Specify Health Check Policy section of the Create Load Balancer, Choose Backends page.

There is text "A health check is a test to confirm the availability of backend servers. A health check can be a request or a connection attempt. Based on a time interval you specify, the load balancer applies the health check policy to continuously monitor backend servers."

There are fields and drop-down lists for the following:
-Protocol
-Interval in milliseconds - Optional
-Number of Retries - Optional
-URL Path (URI)
-Port - Optional
-Timeout in milliseconds - Optional
-Status Code - Optional
-Response Body RegEx - Optional