- 1). Mark the injection site by drawing a small circle on the patient's forearm. As an alternative, place a small adhesive bandage over the injection site and instruct the patient to keep it covered until he has the test read. If the test is negative, it might be difficult to know where the injection was placed. Instruct the person to return within 48 to 72 hours.
- 2). Examine the patient's arm at the injection site. If the skin is flat and flesh colored, the test is considered negative. If there is a red, raised bump at the injection site, she might have been exposed to tuberculosis.
- 3). Perform further diagnostic testing for patient's with a positive PPD test. This includes blood work, chest X-ray and sputum analysis. These tests will confirm a diagnosis of TB.
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