Thank you for your query on Healthcare Magic.
It is a routine to rule out tuberculosis
by doing a mantoux test
in children found to have any significant lymph
nodes swelling in the body.
As your child have fever
with some lymph nodes in the neck, your doctor ordered for mantoux test.
Nothing to worry mantoux test is a screening test for tuberculosis which is performed commonly.
If it comes positive your doctor will interpret the report along with the other blood investigations and with her complaints and if necessary he may order further confirmatory test like histopathological study of lymph node tissue if Mantoux test is positive.
So nothing to worry and follow your Pediatrician
Hope I have answered your query.