Zak,
You can run a report on your patients using the REPORTS function. You can run a specific report for example to give you a list of patients with the diagnosis of Epilepsy that haven't been seen in 6 months. You can then use this list to start making calls. This is one option.
As for labs, you can make reminders that are sent to a staff member or yourself regarding when a patient is due for labs (or appts). Now obviously that doesn't guarantee that they will come in. You can at least document as an addendum that you called, spoke to or sent a letter to the patient.
As for liability, I can't answer that. In our office we attempt two phone calls. After two phone calls we send a letter. Each of these are documented as addendum. I'm with Bert, patients need to be responsible for themselves.
