Conditional Noindex for Dynamic Listing Pages?

[yaelslater]

Hi,

We have dynamic listing pages that are sometimes populated and sometimes not populated. They are clinical trial results pages for disease types, some of which don't always have trials open. This means that sometimes the CMS produces a blank page -- pages that are then flagged as thin content.

We're considering implementing a conditional noindex -- where the page is indexed only if there are results.

However, I'm concerned that this will be confusing to Google and send a negative ranking signal.

Any advice would be super helpful.

Thanks!