longitudinally tb test results what would cause a false negative for tb when is tb test negative? how long to compare tb results why is tb positive can you do a longitudinal test for tuberculosis what makes tb tests false what is the difference between the negative and nil response on the blood test? is tb considered a longitudinal response why is a nil tb tb test a false positive if your immune system is affected by tb is a false positive? which of the following factors makes a tb test false? what is longitudinal tb what is longitudinal mean in a tb test why is tb test negative which condition would cause a false positive for tb what is the difference between a tb nil test and a tb test what is the difference between nil and positive test for tuberculosis which is a longitudinal test for tb can you test someone who has tb and see if the results are the same