This test is conducted on a patient’s blood to know whether they are resistant to certain drugs given to them or not. There are around 20 drugs which will be given in combinations (not all) to the TB patients to cure TB. There are 2-3 kinds of drugs administered to the patient’s according to their resistance level towards the drug. To a patient, generally, the first line drugs are given, if that doesn’t cure, second line drugs are given to them.