TB Tests

What is a TB/PPD Skin Test?

A TB skin test is a small intradermal injection placed under the skin of the forearm.  When placed correctly, the injection should produce a pale elevation of the skin (a wheal) 6 to 10 mm in diameter.   


The test is then read between 48 and 72 hrs. after being placed. The reaction should be measured in millimeters of the induration (palpable, raised, hardened area or swelling).  


2 STEP TB/PPD TEST

Some employers require 2 step PPD testing .  Two-step testing is useful for the initial skin testing of adults who are going to be retested periodically, such as health care workers or nursing home residents. This two-step approach can reduce the likelihood that a boosted reaction to a subsequent TST will be misinterpreted as a recent infection.  


After the 1st step is read the 2nd step is administered 1- 3 weeks later (i.e. the second test can be placed 7-21 days after the first). If the second test is negative, the person is considered uninfected. If the second test is positive, then the person is considered to have a “boosted” reaction to an infection that occurred in the past. Beyond that, secondary testing is useful to help offset potential false negative testing results .


We provide TB skin tests on Monday's, Tuesday's & Wednesday's, no appointment necessary.

FAQ

What can I do with my arm?

Anything you would regularly do.


How do I clean my arm?

You can take showers and baths as you normally do.


What do I do if my arm itches or blisters?

Put an ice cube in a washcloth and place it on your arm. DO NOT SCRATCH!


Can I use a band-aid if it bleeds?

No.  Band-aids increase allergies.  Use a dry cotton ball to dab away any blood.