So even she can't do sputum, 6 months repeat xray will be fine?
It is the protocol. First approach is to do sputum test and repeat x-ray after 3 months.
If the person is unable to produce sputum, then repeated x-ray after 6 months.
They will compare both the x-rays. It is very normal procedure. They do it for almost everyone who has got some scars in their xrays.
The only thing is You will have to wait for 6 months. But as suggested by this other mate, if your mom have any previous xrays done 6-7 months ago, you can take those to the panel physician and ask them to compare it with that (but I am not sure if they will accept the xrays done outside).
Did your mom tried her best to produce any sputum? My mom had to go through the same in her super visa medical 2 years ago and it was hard for her to produce sputum but somehow she Was able to do it. It took 3 months for her to pass the medical at that moment.
So in your case if your mom can not do sputum at all, you will have to wait 6 months to do another x rays.