Accutane and TB

My daughter has been on 60mg. of Accutane and is in her third month.  In the last week, she has developed a very bad cough with odd brownish sputum.  I am concerned that perhaps the doctor will order a TB skin test and some websites recommend not having this test while taking an immunosuppressive med.  I know Accutane is not considered to be this type of drug but other websites suggest that Accutane may have this effect. Should she have an x-ray instead? Also, if she does test positive for TB, would Accutane have to discontinued for a certain length of time before it would be safe to take the TB drugs?

[National Jewish]

I would have a chest x-ray done and test her sputum for routine, fungal, and acid-fast bacilli (AFB) cultures.  She should be treated appropriately if this testing is positive.  If she has a risk factor for tuberculosis (TB) the skin test won't help if it is negative.  Many people with TB have a negative skin test.