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Done Mantoux Test For Child. No Weal Appeared. How Do I Know It Was Administered Correctly?

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Posted on Mon, 24 Sep 2012
Question: How do I know if a Mantoux test was administered correctly? I took my five year old for testing today but I never saw the wheal appear. How soon will the wheal/blister usually disappear. If the test was done incorrectly, can I re do it, and how soon?
doctor
Answered by Dr. Pavan Kumar Gupta (30 minutes later)
Hello
Thanks for the query.
After a mantoux test, a person who has been exposed to the bacteria is expected to mount an immune response in the skin containing the bacterial proteins.
The reaction is read by measuring the diameter of induration  across the forearm  in millimeters. If there is no induration, the result should be recorded as "0 mm". Erythema (redness) should not be measured.
 In your child case the test is negative as there is no induration on the injection site.
There is no chance of getting the test incorrectly done because injection has been given.
However you may repeat the test again after a gap of three weeks for your satisfaction.

I hope to have answered your query however you may revert to me for any further query.
Best of luck
Thanks
Note: For further queries related to your child health, Talk to a Pediatrician. Click here to Book a Consultation.
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Pavan Kumar Gupta

General & Family Physician

Practicing since :1978

Answered : 6704 Questions

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Done Mantoux Test For Child. No Weal Appeared. How Do I Know It Was Administered Correctly?

Hello
Thanks for the query.
After a mantoux test, a person who has been exposed to the bacteria is expected to mount an immune response in the skin containing the bacterial proteins.
The reaction is read by measuring the diameter of induration  across the forearm  in millimeters. If there is no induration, the result should be recorded as "0 mm". Erythema (redness) should not be measured.
 In your child case the test is negative as there is no induration on the injection site.
There is no chance of getting the test incorrectly done because injection has been given.
However you may repeat the test again after a gap of three weeks for your satisfaction.

I hope to have answered your query however you may revert to me for any further query.
Best of luck
Thanks