How long does it take to make a quick phone call or send an e-mail?

My wife had a doctor's appointment last week to check everything is ok with the baby and they did lots of tests.

The thing that annoys me though is when they say "if you don't hear from us everything is ok".

Right, so they will only be in touch if the results aren't good, but how long are you supposed to wait wondering if everything is ok?

Even when they say the results should be back in about a week, you still worry that things got held up for some reason so you still don't know when you should stop worrying.

Why can't they just give you a quick phone call, or even an e-mail saying everything is ok? How long would that take? Not long at all.

In Houston local phone calls are free anyway so it wouldn't cost anything.

Besides, they always keep you waiting for ages when you're there so an extra two minutes wouldn't make any difference while they send someone an e-mail.