(Nicole Morrison/Teal Health via AP)

The doctor is in -- the mailbox, that is.

You can now do self-administered tests for everything from thyroid function to HIV in the privacy of your own home -- and that list continues to grow, as the FDA recently approved the first at-home cervical cancer test .

While the tests can make it easier for people to access healthcare and can be helpful for those who have extreme anxiety about sensitive or invasive medical exams, experts warn that most of the tests cannot replace an actual in-person visit.

Here's what doctors say you can test for at home, and when you should make the trek to your physician's office.

What kinds of at-home tests are available?

There are two kinds at "at-home" tests.

In one type, the patient collects the sample and sends

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