Let me know that in past you suffer from TB ? If yes then it is detected in your X-Ray . No need to worry about that . They will check your X-Ray . If they suspect they will send you to Rumeila hospital . In Rumeila hospital they will take your blood test & will do some skin test . Mean time they will start giving medicines to you . If your TB test is positive or still your TB is active & if you are on WORK Visa then may be they will not grant you residence ....
Hope for the best . Dont worry . i hope your test will be negative .
Think that what ever happening is good for future .
Best luck