A TB risk assessment is a short questionnaire used to determine whether you need a tuberculosis test. It asks about your travel history, living and work environments, medical conditions, and any symptoms of active TB. Based on your answers, a healthcare provider decides if a blood test or skin test is warranted, or if the questionnaire alone is sufficient to clear you. Most people encounter a TB risk assessment when starting a new job in healthcare, enrolling in school, or beginning work in a congregate setting like a shelter or correctional facility.
What the Assessment Actually Asks
A TB risk assessment is typically a one-page form with straightforward yes-or-no questions. The exact wording varies by state and employer, but the questions fall into a few predictable categories.
Travel and birth history questions ask whether you were born outside the U.S., Canada, Australia, or Western and Northern Europe. You’ll also be asked if you’ve lived in or visited areas where TB is common for more than 30 days, including Asia, Mexico, Central and South America, Africa, the Caribbean, or Eastern Europe. Some forms in border regions ask specifically about frequent cross-border travel.
Medical history questions focus on conditions that weaken your immune system: HIV, cancer, organ transplant, diabetes, severe kidney disease, or use of immune-suppressing medications. These conditions make it easier for a dormant TB infection to become active disease, which is why they factor into the assessment.
Exposure and environment questions ask whether you’ve had close contact with someone diagnosed with TB, or whether you live or work in high-risk congregate settings like nursing homes, homeless shelters, or correctional facilities.
Finally, a symptom checklist screens for signs of active TB disease: a cough lasting more than three weeks, unexplained weight loss, heavy night sweats, fever, fatigue, chills, and loss of appetite.
Why It Matters for Test Interpretation
The risk assessment isn’t just a gateway to testing. It directly shapes how your test results are interpreted. For a TB skin test, the threshold for a “positive” result changes based on your risk profile. If you have HIV or are severely immunosuppressed, a skin reaction of just 5 millimeters counts as positive. If you were born in a country where TB is common, use drugs or alcohol, or work in a congregate setting, the threshold rises to 10 millimeters. For someone with no known risk factors, only a reaction of 15 millimeters or more is considered positive.
This sliding scale exists because the likelihood of a true infection varies dramatically between populations. A small skin reaction in a person with HIV is far more concerning than the same reaction in a low-risk individual, where it’s more likely to be a false positive. Without the risk assessment providing context, a test result alone can be misleading.
Latent Infection vs. Active Disease
One of the core purposes of TB screening is distinguishing between two very different conditions. Latent TB infection means the bacteria are present in your body but dormant. You feel completely fine, have no symptoms, and cannot spread TB to anyone else. Roughly a quarter of the world’s population has latent TB. Active TB disease, on the other hand, typically causes symptoms like prolonged coughing, fever, and weight loss, and can be contagious.
The risk assessment helps sort people into the right follow-up pathway. If your questionnaire reveals risk factors or symptoms, you’ll be directed to a blood test or skin test. A positive test result combined with symptoms triggers further evaluation, usually a chest X-ray and sputum samples, to check for active disease. If you test positive but have no symptoms, you likely have latent TB infection, which can be treated to prevent it from ever becoming active.
Who Needs a TB Risk Assessment
Healthcare workers are the most common group required to complete one. CDC guidelines call for all U.S. healthcare personnel to undergo TB screening upon hire, which includes a risk assessment, symptom evaluation, and either a blood test or skin test. Workers who already have a documented history of a prior positive TB test skip the repeat testing but still complete the risk assessment and symptom screen. Those with untreated latent TB infection receive a yearly symptom screen to catch any early signs of progression.
Beyond healthcare, TB risk assessments are commonly required for school staff and volunteers (California, for example, has a statewide mandate for school personnel), teachers, childcare workers, and employees in correctional facilities or long-term care. Some states accept a completed risk assessment with no risk factors identified as sufficient clearance, without requiring a blood test or skin test at all.
Groups at Highest Risk
Certain populations are prioritized for testing after a risk assessment because they face the greatest chance of a latent infection progressing to active disease. People living with HIV top this list, since HIV severely compromises the immune response that keeps TB bacteria in check. People on immunosuppressive therapy, including those taking medications after organ transplants or receiving treatment for autoimmune conditions, face similarly elevated risk.
Other high-priority groups include people born in or who have traveled extensively through countries with high TB rates, people experiencing homelessness, current or former incarcerated individuals, people with diabetes or severe kidney disease, children under five, and anyone who has had recent close contact with a person diagnosed with active TB.
How Symptoms Alone Can Miss Cases
Relying on symptoms to identify TB is surprisingly unreliable. A large study of over 51,000 people screened for TB found that 37% of confirmed cases were completely asymptomatic. Even using the broadest possible combination of signs and symptoms, screening caught only about 60% of cases. The classic symptom of cough alone identified just 24% of confirmed infections.
This is precisely why the risk assessment combines symptom questions with demographic, travel, and medical history. Research shows that factoring in social and environmental risk factors alongside symptoms substantially improves the ability to identify who actually has TB. Models that incorporated these broader risk factors correctly classified about 80% of cases, compared to roughly 64% when relying on symptoms alone.
What Happens After the Assessment
If your risk assessment identifies one or more risk factors, you’ll typically be referred for a TB blood test or skin test. The blood test requires a single blood draw with results in one to three days. The skin test involves a small injection on the inner forearm, with a required return visit 48 to 72 hours later so a provider can measure any reaction.
If your risk assessment turns up no risk factors and no symptoms, many employers and schools accept that result on its own as clearance. You may receive a certificate of completion documenting that you were assessed and found to be low risk. This approach, endorsed by the CDC for healthcare settings, avoids unnecessary testing in people whose chance of having TB is extremely low, reducing false positives that lead to unneeded follow-up procedures and anxiety.