['My sister just had some test done and now we have to wait for the results.', "Uhoh that sounds terrible.  Have they told you how long you might have to wait for?  That's no fun having to wait to hear news like that.", "Ten days. I don't like waiting. It gives your mind to imagine everything good and bad."]
Yeah it's one of those situations where you would almost rather hear the news even if it was bad.  At least then you could start taking steps to combat it.
My sister just had some test done and now we have to wait for the results.