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Hospitals, daycares, schools, nursing homes and some paperwork require a recent tuberculosis test. At Clínica Hispana Cruz 4 we place the skin test, known as PPD or TST, and read the result, with everything explained in Spanish.
How it works
A small amount of fluid is injected just under the skin of the forearm; it feels like a quick pinch and leaves a small bubble that fades within minutes. The test isn't read that day: you come back 48 to 72 hours later so staff can measure whether a firm, raised area formed. If you don't return within that window, the test has to be repeated.
While you wait for the reading
- Don't cover the spot with bandages or creams
- You can shower and get it wet as usual
- Avoid scratching, even if it itches
- Write down the exact day and time of your return
What the result means
Negative: there was no reaction and you get the paperwork for your requirement. Positive: the body has been in contact with the bacteria at some point, not that the person is sick or contagious. The next step is usually a chest X-ray to rule out active disease, and depending on the case, treatment for latent infection is considered.
If you had the BCG vaccine
Many people born in Latin America received it as children. That vaccine can make the skin test read positive. Let the doctor know; in that case a blood test may be more useful to clarify the result.
What to bring
ID, your work or school form if you were given one and, if you've been tested before, the previous result. If you've ever tested positive, tell us before the test is placed: it shouldn't be repeated.
Included in this service
Tuberculosis skin test (PPD)
Result reading
Useful for work and school
Care in Spanish
Ready to schedule your appointment?
Call us now or visit us — no appointment needed
Frequently Asked Questions
Yes. The reaction has to be measured two to three days after placement. If you don't return within that window, it has to be repeated.
Yes, but mention it first. BCG can cause a positive skin reaction, and the doctor will tell you whether a blood test is a better option.
Not necessarily. It shows contact with the bacteria. A chest X-ray follows to check for active disease, which is uncommon.
