How do you document a TB reading?

Record

Record the exact measurement in millimeters of induration on the Mantoux Tuberculin Skin Test Record Form.
Record the date and time the test was read, the name and signature of the person who read the skin test, and the presence or absence of adverse effects (i.e., blistering, redness, and swelling)

What does 0 mm induration mean?

A person with a positive reaction should be referred for a medical evaluation for latent TB infection and appropriate follow-up and treatment if necessary. A measurement of 0 mm or a measurement below the defined cut point for each category is considered negative. 4 Check skin test. Wheal should be 6 to 10 mm in.

How do you read Mantoux test results?

The reaction is read by measuring the diameter of induration (palpable raised, hardened area) across the forearm (perpendicular to the long axis) in millimeters. If there is no induration, the result should be recorded as “0 mm”. Erythema (redness) should not be measured.

What is a positive PPD reading?

An induration of 15 mm or more is considered positive in: Always considered positive in any person. Healthy individuals without any risk factors for TB.

How do you record TB test results?

Record all the information required by your institution for documentation (e.g. date and time of test administration, injection site location, lot number of tuberculin).

When do you read TB test results?

The TST is an intradermal injection of 0.1 ml of tuberculin (PPD) on the inner surface of the forearm. The skin test reaction should be read between 48 and 72 hours after administration.

How do you read a negative TB test?

The test is “negative” if there is no bump (or only a very small bump) at the spot where the fluid was injected. A negative TB skin test usually means that you don’t have TB. In some situations, you may need to have another TB skin test later.

What induration is positive TB test?

An induration of 15 mm or more is considered positive in anyone, even those who don’t think they’ve been exposed to anyone with TB.

How do you know if a TB test is positive or negative?

Positive skin test: This means the person’s body was infected with TB bacteria. Additional tests are needed to determine if the person has latent TB infection or TB disease. Negative skin test: This means the person’s body did not react to the test, and that latent TB infection or TB disease is not likely.

What does a negative TB test look like after 48 hours?

If the area of skin where you received the PPD injection isn’t swollen or is only slightly swollen 48 to 72 hours after the injection, the test results are negative. A negative result means that you most likely haven’t been infected with the bacteria that cause TB.

What tuberculin means?

Definition of tuberculin : a sterile liquid containing the growth products of or specific substances extracted from the tubercle bacillus and used in the diagnosis of tuberculosis especially in children and cattle.

What if a TB test does not bubble?

What if I have a negative TB skin test? In most cases, if there is no bump where the testing fluid was placed, you probably are not infected with TB. A doctor or nurse must look at the area to be sure.