Difference Wiki

Positive TB Skin Test vs. Negative TB Skin Test: What's the Difference?

Edited by Huma Saeed || By Sawaira Riaz || Published on February 12, 2024
A Positive TB Skin Test indicates a likely exposure to tuberculosis bacteria, while a Negative TB Skin Test suggests no evidence of exposure.

Key Differences

A Positive TB Skin Test, typically indicated by a raised, red bump at the test site, suggests that the individual has been exposed to the tuberculosis bacteria. In contrast, a Negative TB Skin Test, where no significant reaction occurs at the test site, implies a lack of TB exposure.
Sawaira Riaz
Feb 12, 2024
The Positive TB Skin Test does not necessarily mean active tuberculosis; it could indicate a latent or past infection. On the other hand, a Negative TB Skin Test generally means the person does not have a latent or active TB infection.
Sawaira Riaz
Feb 12, 2024
Certain conditions, like a weakened immune system, can lead to a false-negative result in a TB Skin Test, while a positive result might require further testing to confirm active TB. Negative TB Skin Tests are usually more straightforward, indicating no TB infection.
Sawaira Riaz
Feb 12, 2024
Vaccination with the Bacille Calmette-Guérin (BCG) vaccine can cause a false-positive TB Skin Test, whereas a Negative TB Skin Test is unaffected by this vaccine.
Aimie Carlson
Feb 12, 2024
A Positive TB Skin Test requires careful evaluation and possibly additional tests, while a Negative TB Skin Test is typically conclusive in indicating no TB infection.
Aimie Carlson
Feb 12, 2024
ADVERTISEMENT

Comparison Chart

Indication

Suggests exposure to TB bacteria.
Suggests no exposure to TB bacteria.
Sawaira Riaz
Feb 12, 2024

Physical Reaction

Raised, red bump at the test site.
No significant reaction at the test site.
Huma Saeed
Feb 12, 2024

Implication for Active TB

Does not confirm active TB, further testing needed.
Generally rules out active TB.
Sawaira Riaz
Feb 12, 2024

Effect of BCG Vaccination

Can cause a false-positive result.
Unaffected by BCG vaccination.
Sawaira Riaz
Feb 12, 2024

Need for Additional Testing

Often requires further tests to confirm or rule out active TB.
Usually no additional testing required unless circumstances change.
Aimie Carlson
Feb 12, 2024
ADVERTISEMENT

Positive TB Skin Test and Negative TB Skin Test Definitions

Positive TB Skin Test

Indicates likely exposure to TB bacteria.
Her Positive TB Skin Test led to further diagnostic procedures.
Sawaira Riaz
Jan 18, 2024

Negative TB Skin Test

Indicates no detectable TB exposure.
Her Negative TB Skin Test was a relief, showing no signs of TB.
Sawaira Riaz
Jan 18, 2024

Positive TB Skin Test

Requires further evaluation to confirm active TB.
Following his Positive TB Skin Test, he underwent a chest X-ray.
Sawaira Riaz
Jan 18, 2024

Negative TB Skin Test

Typically does not require further TB testing.
With a Negative TB Skin Test, no additional TB screening was necessary.
Sawaira Riaz
Jan 18, 2024

Positive TB Skin Test

Might be influenced by prior BCG vaccination.
Her Positive TB Skin Test was attributed to her BCG vaccination as a child.
Sawaira Riaz
Jan 18, 2024

Negative TB Skin Test

Unaffected by previous BCG vaccination.
Despite his BCG vaccination, his TB Skin Test was Negative.
Aimie Carlson
Jan 18, 2024

Positive TB Skin Test

Can result from a latent or previously treated TB infection.
Despite feeling healthy, his Positive TB Skin Test revealed a past infection.
Sawaira Riaz
Jan 18, 2024

Negative TB Skin Test

Shows no immune response to the tuberculin skin test.
The absence of a reaction on his arm confirmed a Negative TB Skin Test.
Huma Saeed
Jan 18, 2024

Positive TB Skin Test

Shows an immune response to tuberculin used in the test.
The test's raised bump was a classic sign of a Positive TB Skin Test.
Sawaira Riaz
Jan 18, 2024

Negative TB Skin Test

Generally rules out current or past TB infection.
The Negative TB Skin Test suggested she had never been exposed to TB.
Sawaira Riaz
Jan 18, 2024

FAQs

Can BCG vaccination affect a TB Skin Test result?

Yes, it can cause a false-positive result.
Aimie Carlson
Feb 12, 2024

Can someone with a Negative TB Skin Test have TB?

It's rare, but possible in cases of weakened immunity.
Harlon Moss
Feb 12, 2024

Does a Negative TB Skin Test need follow-up?

Not usually, unless there are symptoms or risk factors for TB.
Harlon Moss
Feb 12, 2024

Is a Negative TB Skin Test conclusive?

Generally, it rules out TB infection unless there's a risk of false negatives.
Sawaira Riaz
Feb 12, 2024

What does a Positive TB Skin Test indicate?

It suggests exposure to tuberculosis bacteria.
Sawaira Riaz
Feb 12, 2024

Can a Positive TB Skin Test mean active TB?

Not necessarily; it could indicate latent or past infection.
Huma Saeed
Feb 12, 2024

What does a Negative TB Skin Test mean?

It suggests no exposure to TB bacteria.
Sawaira Riaz
Feb 12, 2024

Are further tests needed after a Positive TB Skin Test?

Yes, to determine if it's an active TB infection.
Sawaira Riaz
Feb 12, 2024

Is a Positive TB Skin Test always accurate?

No, it can be influenced by factors like past vaccinations.
Aimie Carlson
Feb 12, 2024

Are there false negatives in TB Skin Tests?

Yes, especially in individuals with compromised immune systems.
Aimie Carlson
Feb 12, 2024

How long after exposure does a TB Skin Test become positive?

Typically, 2-10 weeks after exposure to TB bacteria.
Sawaira Riaz
Feb 12, 2024

Can a Positive TB Skin Test indicate immunity to TB?

No, it indicates exposure, not immunity.
Sawaira Riaz
Feb 12, 2024

Is it safe for pregnant women to have a TB Skin Test?

Yes, TB Skin Tests are considered safe during pregnancy.
Aimie Carlson
Feb 12, 2024

How is a Positive TB Skin Test confirmed?

Through additional tests like chest X-rays or sputum tests.
Sawaira Riaz
Feb 12, 2024

How is a TB Skin Test performed?

By injecting a small amount of tuberculin under the skin.
Janet White
Feb 12, 2024

Can a Negative TB Skin Test turn positive later?

Yes, if exposed to TB after the initial test.
Aimie Carlson
Feb 12, 2024

What factors can lead to a false Positive TB Skin Test?

Previous TB infection, BCG vaccination, or non-TB mycobacteria exposure.
Janet White
Feb 12, 2024

How common are Positive TB Skin Tests in TB-endemic areas?

Quite common due to higher exposure rates.
Janet White
Feb 12, 2024

Can someone with a latent TB infection have a Positive TB Skin Test?

Yes, latent TB often results in a positive test.
Aimie Carlson
Feb 12, 2024

What is the treatment for a Positive TB Skin Test?

Treatment depends on whether it's latent or active TB.
Harlon Moss
Feb 12, 2024
About Author
Written by
Sawaira Riaz
Sawaira is a dedicated content editor at difference.wiki, where she meticulously refines articles to ensure clarity and accuracy. With a keen eye for detail, she upholds the site's commitment to delivering insightful and precise content.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

Trending Comparisons

Popular Comparisons

New Comparisons