What is the normal range for Mantoux test?
Understanding results ofMantoux Screening
| Reference Range | Interpretation |
|---|---|
| 5 to 9 mm | Equivocal |
| (Diameter of Induration)0 to 4 mm | Negative |
| 10 mm and above | Positive |
What is mm induration for TB test?
In a healthy person whose immune system is normal, induration greater than or equal to 15 mm is considered a positive skin test. If blisters are present (vesiculation), the test is also considered positive. In some groups of people, the test is considered positive if induration less than 15 mm is present.
What does a 17mm induration TB test?
Within 48 to 72 hours, a positive TB skin test is marked by an area of reddish induration greater than 10 mm. It is the induration (firm bump) that is gently palpated that determines the size, not the area of redness. This reaction is slightly larger than the average positive test 17 mm in size.
What does mm of induration mean?
The reaction should be measured in millimeters of induration (palpable, raised, hardened area or swelling).
What is a positive TB test reading?
The test is “positive” if there is a bump of a certain size where the fluid was injected. This means you probably have TB germs in your body. Most people with a positive TB skin test have latent TB infection. To be sure, your doctor will examine you and give you a chest x-ray.
What do the results of the Mantoux test depend on?
The results of the Mantoux test depend on the presence of absence of a raised, thickened local area of skin reaction, which is referred to as an induration. The skin test should be read 48 to 72 hours after the injection is administered.
How do you read a Mantoux skin test?
The patient is instructed to keep the test site clean, uncovered, and to not scratch or rub the area. The Mantoux skin test should be read between 48 and 72 h after administration. Reading should be performed in a good light, with the forearm slightly flexed at the elbow.
What is the Mantoux test for tuberculosis?
The TST, or Mantoux test, is the most popular method for detecting latent tuberculosis infection. It involves injecting a certain amount of an internationally standardised pure protein derivative (PPD) of tuberculin into the skin. Mantoux test procedure? The Mantoux test does not require an overnight fast.