Do you routinely isolate and test for TB in a patient incidentally found to have a miliary pattern of nodules on chest CT?

The short answer is yes. CDC recommends applying airborne isolation for any "suspected" case of TB. So if you suspect, you should isolate until you rule out with 3 negative AFB or have an alternative diagnosis.

Keep in mind pretest probability and risk factors for that patient with the miliary patte...

Yes, I routinely isolate and test for TB in patients incidentally found to have a milliary nodular pattern on the CT chest.