Z Pass missing

Hi

I have ticked the render layer z pass (which I think is by default) but it is not available in the Render Layers compositor node. I am using version 2.79.

Thanks for any help

Show us what you see.
Supply a demo .blend file (something required for ALL support questions)

If its just white then you are seeing the correct z value it just exceeds white colour.

If you want see the Depth-Pass, you need the Normalize-node. (&more contrast with a colorramp-node)