A positive TB test is red & raised. This 'induration' varies from person to person, depending on exposure history, country of birth, and BCG history. Usually anything over 10 mm induration is considered positive, although 5 mm may also be considered positive in some circumstances, eg. immune suppressed persons or close contact with infectious TB.

When a QED? test result is positive, a dark purple color bar forms within the measurement scale. This color is distinctly darker than the pink or orange color seen as the sample fills the device. The color bar on a positive test -- the same color seen in the QA Spot? -- develops in 2 minutes for the A150 test, in 5 minutes for the A350. See similar questions...

A positive TB test means that someone has been exposed to the TB germ and follow up evaluation is needed. Once a positive TB test has been confirmed to be truly positive, there is no point in having repeat TB tests in the future. They will not hurt you, or cause disease, but will always continue to be positive. BCG vaccine (Bacille Calmette-Guerin) used in countries where TB is endemic, can decrease the severity of TB in children but will not prevent TB infection. See similar questions...

We use a two-step TB test. On the first day, the test is delivered to your forearm; 48 hours later a nurse "reads" the results of your skin test. The visits are brief, but you must be sure to schedule them so that you can return 48 hours later for a reading. See similar questions...

No. Their medical history is probably entirely different from yours. Unless there is a definite active case in the classroom & there has been contact, there is no need to be tested. See similar questions...

The person with a positive TB skin test who has no signs or symptoms of TB cannot give the TB germ to anyone else. The positive TB skin test indicates only that the person may have been exposed to the TB germ. It does not mean that they have TB disease. The Health Department is notified about all persons suspected of having or diagnosed with active TB disease which can be passed on to another person. See similar questions...

A positive skin test means that the germ that causes TB has caused an infection in your body. About 25,000 of the 250,000 people in Santa Cruz County have a positive skin test. You will need to get another test, a chest X-ray, to see if you are one of the 20 people out the 25,000 whose infection is advanced and who has TB disease. Only the few who have TB disease are contagious to others, and with treatment they can be cured and not spread the disease. See similar questions...

A positive result is indicated when there is a line in the control or "C" zone of the test, but absolutely no line whatsoever in the testing or "T" zone. For more information download the "Reading an On-Site Test/Initial vs. Confirmatory Cutoff Levels" PDF from the Tech Support page. See similar questions...

You will need to obtain a chest x-ray and be evaluated to determine if you have active Tuberculosis. Chest xrays will be provided at no cost; referral will then be made to your private health care provider or to a health department clinic. See similar questions...

A positive skin test means that a person has been infected with TB germs sometime during that person's life. It does not indicate that a person is contagious or symptomatic. See similar questions...

No, it simply means that the USDA does not feel that sufficent testing has been completed to determine that the elephants are free of TB. See similar questions...

A positive antibody test could mean one of two things. It could mean that a person is infected with hepatitis C and is a chronic carrier. Or, it could mean that the person was infected with hepatits C but has cleared it from his or her body. An antibody test cannot tell anyone which of those two categories applies. Once infected, you will always have hepatitis C antibodies, and therefore will always test positive on a hepatitis C screening test. See similar questions...

No, even though a gene mutation may be present, you are not at 100% risk for developing cancer. An individual with a BRCA1 and/or BRCA2 alteration is more likely to develop cancer than an individual without an alteration. However, not every individual who has a BRCA1 and/or BRCA2 alteration will develop cancer, because genes are not the only factor affecting cancer risk. See similar questions...

A false positive hearing screening test result is when a baby does not have a hearing loss but the newborn does not pass the hearing screening. Hearing screening tests are not meant to diagnose hearing loss in infants. Instead, they are meant to find all infants that might have a hearing loss. Because they are not a diagnostic test, hearing screening tests sometimes misidentify infants as having a hearing loss. See similar questions...

Cough is reported less frequently among HIV positive TB cases, since there is less cavitation, inflammation and endo-bronchial irritation because of impaired cellular immunity. Majority of HIV positive pulmonary TB cases is smear positive though their proportion is less than among HIV negative pulmonary TB cases. The main types of Extra-pulmonary TB seen among HIV positive patients are - lymphadenopathy, pleural effusion, pericardial effusion, miliary TB and tuberculous bacteraemia. See similar questions...