Get your health question answered instantly from our pool of 18000+ doctors from over 80 specialties
124 Doctors Online

By proceeding, I accept the Terms and Conditions

Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

HCM Blog Instant Access to Doctors
HCM BlogQuestions Answered
HCM Blog Satisfaction

What are the normal readings for Mantoux test?

Answered by
Dr.
Dr. Naveen Kumar

General & Family Physician

Practicing since :2008

Answered : 154 Questions

default
Posted on Wed, 18 May 2016 in Medicines and Side Effects
Question: How many mm of induration is a negative reading for the mantoux ppd reading- what is the mm # for negative result for mantoux tuberculin test (PPD)
doctor
Answered by Dr. Naveen Kumar 1 hour later
Brief Answer:
Induration size of 5mm and above are usually considered positive

Detailed Answer:
Welcome to health care magic, I share your concern and I will try to help you out in best possible way.

The( Mantoux test ) tuberculin skin test is one of the few investigations that are still widely used as an important test for diagnosing tuberculosis. Though very commonly used by physicians worldwide its interpretation always remains difficult and controversial. Various factors like age, immunological status coexisting illness etc influence its outcome, so also its interpretation.
There is no correlation between the size of induration and likelihood of current active TB disease but the reaction size is correlated with the future risk of developing TB disease.
If the induration exceeds 5mm, it is cosidered positive and there are different set of conditions which bring out different induration sizes like 10mm and 15mm etc..
On the other hand, a negative test does not always mean that a person is free of tuberculosis. People who have been infected with TB may not have a positive skin test (known as a false negative result) if their immune function is compromised by chronic medical conditions, cancer chemotherapy, or AIDS. Additionally, 10%-25% of people with newly diagnosed tuberculosis of the lungs will also have a negative result, possibly due to poor immune function, poor nutrition, accompanying viral infection, or steroid therapy. Over 50% of patients with widespread, disseminated TB (spread throughout the body, known as miliary TB) will also have a negative TB test.

I hope this helps you.
If you have any further query, I would be glad to help you.
If not, you may close the discussion and if possible you may rate the answer for me, so that I get a good feedback.

Dr. Naveen XXXXXXX
Medical Consultant.
Ebix, Inc.
YYYY@YYYY
Above answer was peer-reviewed by : Dr. Naveen Kumar
doctor
premium_optimized

The User accepted the expert's answer

Share on
Question is related to
Diseases and Conditions ,   ,  
Drug/Medication
Treatment/Therapy
Lab Tests

Recent questions on  HIV

doctor1 MD

Hi, last night I found a growth on my boyfriend's penis that looks like a mole that has just developed over the past 2 weeks, also, everytime we...

doctor1 MD

I took a test n I m pregnant I ve had unprotected sex with my boyfriend cuz I m on the Nuva ring I had an unexpected 2 nights with my ex the first...

doctor1 MD

Hi I wasn't sure who to ask or what to do about this but i couldn't really ask my parents so I figured this would be the best place and hopefully...

doctor1 MD

My boyfriend and I had sex this morning. We used a condom. He was pulling out as he was ejaculating. The condom got stuck halfway out of my vagina....

doctor1 MD

I just had a mutual masturbation session with a sex worker However she removed her hand from inside her vagina and used it roughly on my penis in a...

doctor1 MD

i bought food the food was in a container with a plastic at the top covering the container how ever i notice the plastic on 1 container was...

doctor1 MD

Dear doctor thanks for your valuable reply however my further query is for last two weeks I have a mild rash under my eye which is persistent and...