Read tuberculosis test results between 48 and 72 hours after the PPD intradermal test is administered.
The intradermal PPD (purified protein derivative) or Mantoux test refers to the common test for tuberculosis (TB). TB is a disease affecting the lungs, and is highly contagious. The intradermal PPD test is usually required of health care personnel, those who work in education, and is recommended for anyone with suspected exposure to the tuberculosis virus. The test consists of injecting the extract just under the skin of the forearm, and then rating the reaction.
Things You'll Need
- Ruler or measuring Tape
Use a ruler or measuring tape, and measure the diameter of the largest portion of the raised bump at the TB test site (known as induration). Record the measurement in millimeters (mm.). Do not measure red areas if they aren't raised.
A measurement of greater than or equal to 15 mm. at the PPD intradermal test site is considered positive in a healthy person with no known exposure to TB.
A measurement of 10 mm. or greater at the PPD intradermal test site is considered positive in a person with underlying diabetes, kidney disease or a health care worker or other person with likely personal contact to a TB patient.
A measurement of 5 mm. or greater at the PPD intradermal test site is considered positive for tuberculosis in a person with underlying autoimmune disease, such as HIV or Crohn's.
Check for major blistering at the test site. Blisters are always considered a positive TB test result.
Tips & Warnings
- Recent vaccinations with live viruses or use of immunosuppressive drugs can result in false negative test readings.
- A previous BCG vaccination can result false positive test readings.
How to Read a TB Test
The tuberculosis or TB skin test, also known as a PPD test, is used to determine if someone has developed an immune...
Tuberculin Vs. Insulin Syringe
... half to one cubic centimeter of fluid. They are used to administer medication and perform a tuberculosis test called a PPD.
How to Give an MMR & TB Skin Test
The TB test consists of an intradermal (into the skin) injection of a purified protein derivative ... How to Read a TB...
How to Document a TB Test Reaction
How to Read a Positive TB Test. TB, or Tuberculosis, is a disease in which bacteria infect and damage the lungs. ......
How to Perform Intradermal Injections
Intradermal injections enter the top layers of the skin. The most common intradermal injections are TB skin tests and allergy shots. Intradermal...
How to Tell If a TB Test Is Positive?
Measure swelling at the injection site. A positive test produces a large, hard swelling of 15mm, or slightly more than 1/2 inch....
How to Measure Nurse Staffing
Hospitals, insurance companies, government agencies and citizen groups are always trying to figure out how to interpret what is going right and...
What Does a Positive Tuberculosis Skin Test Look Like?
After the PPD has been injected, you wait 48 to 72 hours and then return to have a health-care professional look at...