A positive TB skin test only means previous exposure to TB or a previous immunization
with BCG vaccine
. If any of the above are likely, then the positive test does not mean anything now.
A chest X Ray
does not show any foci that means no obvious sign of disease and absence of upper lobe lung fibrosis
is also a good sign.
The only other test they might ask you to get done is a QuantiFERON test or the T-SPOT TB test where in the level of gamma interferon
release is checked on exposure of your blood cells to specific TB antigens. Based on this result, they will consider if you need any further investigations. If this test is negative, and you have had no exposure to TB in the past, then all is in the clear for you to join the Navy as per this is concerned.