TB testing is required for virtually all healthcare workers in the United States at the time of hire. The CDC recommends that every healthcare worker undergo TB screening before starting a new position, and most employers treat this as a mandatory step in the onboarding process. Beyond that initial test, the requirements get more nuanced, and they vary depending on federal guidelines, your employer’s policies, and the state where you work.
What Federal Guidelines Require
The CDC recommends all U.S. healthcare personnel be screened for TB upon hire, a step commonly called preplacement screening. This baseline screening includes four components: an individual risk assessment, a symptom evaluation, a TB test (either a blood test or a skin test), and additional evaluation for active TB disease if needed.
OSHA enforces TB protections through the General Duty Clause of the Occupational Safety and Health Act, which requires employers to provide a workplace free from recognized hazards likely to cause death or serious harm. OSHA’s longstanding position is that following the most recent CDC guidelines satisfies this requirement. So while there isn’t a standalone federal law that says “all healthcare workers must be TB tested,” the practical effect is the same: employers are expected to screen their staff, and failing to do so creates a compliance risk.
Annual Testing Is No Longer Routine
If you’ve heard that healthcare workers need a TB test every year, that changed in 2019. Updated recommendations from the CDC and the National Tuberculosis Controllers Association eliminated routine annual TB screening for healthcare personnel. After your baseline test, you do not need repeat testing at any interval unless there’s a known exposure to someone with infectious TB or evidence of ongoing transmission at your facility.
This was a significant shift from previous guidelines, which had recommended annual testing as standard practice. The change reflected the declining rate of TB in the U.S. and the low yield of annual screening in settings without active transmission. However, all healthcare workers should still receive annual TB education, even without being retested.
OSHA has acknowledged this update and allows employers to discontinue annual testing, provided they follow every other element of the current CDC guidelines along with any state and local requirements. Employers are still responsible for evaluating exposure risk and determining which employees may need more frequent screening based on factors like the number of infectious TB patients seen at the facility or whether delays in isolating those patients have occurred.
State Laws Can Override Federal Guidance
Here’s where it gets important: your state may still require annual TB testing regardless of what the CDC recommends. California is a clear example. State regulations mandate annual TB testing for employees in a wide range of healthcare settings, including general acute care hospitals, skilled nursing facilities, home health agencies, intermediate care facilities, psychiatric hospitals, chemical dependency recovery hospitals, and correctional treatment centers. These are codified in California’s Title 22 regulations and remain in effect.
California is not alone. Several states maintain their own TB screening schedules that are stricter than current CDC recommendations. Your employer’s human resources or occupational health department will know which rules apply to your specific facility and role. If your state law requires annual testing, that requirement takes precedence over the CDC’s more relaxed federal guidance.
What the Screening Process Looks Like
At baseline, your employer will assess your individual risk factors. You’ll be considered at increased risk if you’ve had prior exposure to TB, spent time in countries where TB is common (including being born in one of those countries or traveling there frequently), or have a suppressed immune system from a condition like HIV or from medications that lower immune function.
You’ll also be evaluated for symptoms of active TB disease: a cough lasting three weeks or longer, chest pain, coughing up blood or phlegm, unexplained weight loss, fatigue, loss of appetite, chills, fever, or night sweats. Then you’ll receive either a TB skin test or a TB blood test.
Blood Test vs. Skin Test
Two types of tests are used for TB screening. The tuberculin skin test (TST) involves injecting a small amount of protein under the skin of your forearm and reading the reaction 48 to 72 hours later. The blood test, known as an interferon-gamma release assay (IGRA), requires a single blood draw with no return visit.
The key difference is accuracy in people who received a BCG vaccine, which is a TB vaccine given routinely in many countries outside the U.S. The skin test can produce false positives in BCG-vaccinated individuals because it reacts to proteins shared between the vaccine strain and the TB bacterium. Blood tests use proteins unique to the TB bacterium that are absent in the BCG vaccine, so prior vaccination won’t trigger a false positive. For healthcare workers who were vaccinated as children overseas, the blood test is the more reliable option and is increasingly preferred.
What Happens if You Test Positive
A positive TB test does not mean you have active, contagious TB disease. It typically means you have latent TB infection, where the bacteria are present in your body but dormant. You aren’t sick and can’t spread it to others. To confirm this, you’ll need a chest X-ray. If the X-ray is normal and you have no symptoms, you’ll be diagnosed with latent TB infection rather than active disease.
With a latent TB diagnosis, you can continue working. Your employer will likely recommend treatment to reduce the risk of the infection becoming active later. Treatment options vary in length. Older regimens lasted nine months, but shorter courses of three to four months are now more widely used and have higher completion rates among healthcare workers. A study tracking treatment outcomes over a decade found that healthcare workers were significantly more likely to finish the shorter regimens than the traditional nine-month option.
If you’ve already tested positive in the past and have documentation of a prior positive result plus a normal chest X-ray, you generally won’t be retested with a skin or blood test at a new job. Instead, your screening will focus on a symptom evaluation and risk assessment, since repeat testing would just trigger another positive result without adding useful information.
After a Known Exposure
If you’re exposed to a patient or coworker with infectious TB, your facility’s occupational health team should arrange prompt symptom evaluation and follow-up testing. This applies even if your baseline test was negative and you wouldn’t otherwise be due for screening. The timing of follow-up testing after exposure accounts for the window period it takes for the immune system to mount a detectable response to TB bacteria. Your employer is responsible for identifying exposed workers and providing appropriate follow-up at no cost to you.