Most workers need a TB test only once, at the time of hire. The CDC no longer recommends routine annual TB testing for the majority of employees, including healthcare workers, unless there’s been a known exposure to someone with active TB or ongoing transmission at the workplace. Your specific schedule depends on your industry, your state’s laws, and whether you’ve ever tested positive.
The Current CDC Recommendation
The CDC’s guidance is straightforward: all healthcare personnel should be screened for TB upon hire (called preplacement screening), which includes a risk assessment, a symptom check, and either a blood test or skin test. After that baseline test, routine serial testing at any interval is not recommended for workers who test negative, as long as there’s no known exposure event or ongoing transmission at the facility.
This is a significant shift from older policies. Many hospitals and clinics used to require annual TB tests for all staff. The CDC moved away from that approach because the rate of TB in the United States has dropped substantially, and repeated testing of low-risk workers produces more false positives than meaningful results. Instead, the current model focuses on testing when there’s an actual reason to test.
Industries That Still Require Regular Testing
While the CDC’s general guidance applies broadly, certain work environments carry higher TB risk and may still require annual or periodic testing.
Correctional facilities: Staff in prisons and jails who have a negative baseline TB test should have follow-up testing at least annually, according to CDC guidance. Incarcerated populations have higher rates of TB, and the close quarters of correctional settings increase transmission risk.
Homeless shelters and substance abuse treatment centers: Employees working with populations at elevated risk for TB are more likely to face annual testing requirements set by their employer or local health department.
Schools and childcare centers: Requirements vary by state. South Carolina, for example, requires one TB test completed within 12 months before hire for school and childcare employees, but does not mandate annual retesting. Instead, the state recommends annual health education about TB and other communicable diseases. Other states may have stricter or looser rules, so check with your employer or state health department.
Long-term care and nursing homes: Federal regulations require TB screening on admission for residents and after discovery of a new case, with additional requirements varying by state. Staff testing policies often follow state health department mandates rather than a single national standard.
What Replaces Annual Testing
If your employer has dropped annual TB tests, you’re likely doing an annual symptom screening instead. This is typically a short questionnaire rather than a blood draw or skin test. It asks whether you’ve experienced a cough lasting more than three weeks, unexplained fevers or chills, night sweats, coughing up blood, unexplained weight loss, persistent fatigue, or chest pain. It also asks whether you’ve had contact with anyone with active TB in the past year and whether you’re on medications that suppress your immune system.
A healthcare provider reviews your answers. If anything raises concern, you’ll be referred for an actual TB test or further evaluation. If your answers are unremarkable, you’re cleared for another year. This approach is faster, cheaper, and avoids the complications of repeat testing in low-risk workers.
Blood Test vs. Skin Test
When you do need a TB test, you’ll typically choose between two options: the TB skin test (where a small amount of fluid is injected under the skin of your forearm) and the TB blood test. The CDC encourages healthcare providers to use blood tests, and they’re the preferred choice in two situations: if you’ve ever received the BCG vaccine (common in many countries outside the U.S.) or if you might not return for the follow-up visit that a skin test requires.
The skin test requires two visits. You get the injection, then return 48 to 72 hours later so a provider can measure any reaction. The blood test requires only one visit and results can be available within 24 hours, though some labs take several days. Blood tests are also unaffected by prior BCG vaccination, which frequently causes false positives on skin tests. The tradeoff is that blood tests tend to cost more and the blood sample must be processed within a tight window to remain accurate.
If You’ve Tested Positive Before
Workers with a history of a positive TB test or documented latent TB infection follow a different path. You won’t take the standard skin or blood test again, because it will keep coming back positive and won’t tell you anything new. Instead, your screening relies on symptom evaluation and, when needed, a chest X-ray.
Repeat chest X-rays are not required in most cases. The CDC specifies that you only need another chest X-ray if you develop signs or symptoms of active TB disease, or as part of evaluation before starting treatment for latent TB infection. Your employer should accept documentation of your prior positive result along with a normal chest X-ray and symptom screening in place of a new TB test.
What Your State Might Require
TB testing frequency for work is ultimately governed by a patchwork of federal guidance, state regulations, and employer policies. OSHA does not set a specific TB testing schedule, but it does require employers to provide a workplace free from recognized hazards, which means facilities with TB exposure risk must have appropriate screening programs. OSHA also mandates that employers record any work-related TB infections and maintain respiratory protection programs, including annual respirator fit testing, for workers in high-risk settings.
Because state requirements vary significantly, the testing schedule your employer hands you may not match what a friend in another state experiences. Some states mandate annual testing for healthcare workers regardless of the CDC’s updated guidance. Others have adopted the newer risk-based approach. Your HR or occupational health department should be able to tell you which state regulations apply to your role. If you’re starting a new job and unsure what documentation to bring, a TB test result from within the past 12 months is the safest bet for meeting most preplacement requirements.