A positive TB blood test during your immigration medical exam does not automatically mean you have active tuberculosis or that your green card application will be denied. It means additional medical evaluation is required, usually beginning with a chest X-ray. Your civil surgeon will determine whether you have latent TB infection, whether additional testing is needed, and what must happen before Form I-693 can be completed.

If you are completing an immigration medical examination in Indianapolis or the surrounding Central Indiana area, understanding these steps can help you prepare for follow-up appointments and avoid unnecessary confusion.

What happens after a positive TB blood test for immigration?

According to the CDC Technical Instructions for civil surgeons, a positive interferon-gamma release assay (IGRA) requires a chest X-ray.

The typical process is:

1. Review the positive result. Your civil surgeon evaluates the IGRA alongside your medical history and symptoms.
2. Complete a chest X-ray. The imaging helps identify findings that could indicate active tuberculosis.
3. Determine whether additional evaluation is necessary. Some applicants need referral to the health department for further testing.
4. Document the medical findings. The civil surgeon assigns the appropriate TB classification and completes the required medical documentation when permitted.
5. Discuss follow-up care. Applicants diagnosed with latent TB infection should receive guidance about preventive treatment.

Not every applicant with a positive TB blood test needs the same follow-up.

Source: CDC Tuberculosis Technical Instructions for Civil Surgeons.

What does a positive QuantiFERON or IGRA test mean?

The TB blood test used during immigration examinations is called an interferon-gamma release assay (IGRA).

Two commonly used tests are QuantiFERON-TB Gold and T-SPOT.TB.

A positive result indicates TB infection but does not, by itself, establish whether the infection is inactive or whether the person has active TB disease.

Latent TB infection (inactive TB)

Latent TB infection means TB bacteria are present in the body without causing active disease.

People with latent TB:

• Generally do not have symptoms of active TB disease.

• Cannot spread TB bacteria to other people.

• May be advised to receive preventive treatment.

• May be able to complete their immigration medical documentation without completing latent-TB treatment first.

Active TB disease

Active TB disease occurs when tuberculosis bacteria cause illness.

Possible symptoms include persistent cough, fever, night sweats, unexplained weight loss and fatigue.

Additional testing may be required to determine whether active TB disease is present. Applicants with suspected infectious TB disease must follow the CDC referral and evaluation requirements before their civil surgeon can provide the applicable medical clearance.

Important: A positive IGRA alone cannot distinguish latent infection from active disease.

Do you need a chest X-ray after a positive TB test?

Yes. Under CDC immigration medical examination requirements, applicants with a positive IGRA must receive a chest X-ray.

The civil surgeon reviews the imaging alongside symptoms, medical history and examination findings.

A chest X-ray helps determine whether additional evaluation for infectious TB disease is necessary.

What if your chest X-ray is normal?

If you have a positive IGRA, no symptoms of TB disease, no known HIV infection and a chest X-ray without findings suggesting infectious TB disease, the civil surgeon may classify you as having Class B2 TB, Latent TB Infection, depending on your documented treatment history and other findings.

Latent TB must be reported to the appropriate health department, but treatment completion is not required solely for immigration status adjustment.

What if your chest X-ray is abnormal?

If the imaging suggests infectious TB disease, the civil surgeon must refer you to the appropriate health department for additional evaluation.

The evaluation may include sputum testing, which examines material coughed up from the lungs.

The civil surgeon must receive the required health-department documentation before signing the I-693 when this referral pathway applies.

A normal X-ray does not eliminate the need for referral when other CDC criteria, such as concerning symptoms or known HIV infection, are present.

Will a positive TB test delay your immigration medical exam?

A positive TB blood test can affect when Form I-693 is ready, but the timeline depends on the findings.

There is no universal completion time for all applicants.

If sputum cultures are required, the testing process can take several weeks. Your civil surgeon should explain the applicable next steps.

Does latent TB prevent you from completing Form I-693?

Latent TB infection does not automatically prevent completion of Form I-693.

Under CDC instructions, applicants who meet the criteria for Class B2 latent TB infection do not need to complete latent-TB treatment before their I-693 can be finalized.

However, the civil surgeon must document the appropriate classification and comply with the required reporting process.

Preventive treatment remains important because latent infection can progress to active disease.

Discuss your treatment options with your healthcare provider.

Can a positive TB test cause your green card application to be denied?

A positive TB screening result alone does not determine whether USCIS will approve or deny an immigration application.

The purpose of the immigration medical examination is to identify and document relevant medical conditions under federal requirements.

Your civil surgeon handles the medical evaluation and classification. USCIS makes the immigration decision.

Applicants with infectious TB disease may need treatment and additional evaluation before medical clearance is available.

If you have concerns about an immigration filing deadline or your individual application, consult an immigration attorney or accredited representative.

What if you previously had TB or received the BCG vaccine?

Previous positive TB test

If you previously tested positive for TB, tell your civil surgeon and bring any available documentation.

Useful records may include:

• Previous QuantiFERON or T-SPOT.TB results.

• Prior chest X-ray reports.

• Records of latent TB treatment.

• Documentation of treatment for active TB disease.

A previously positive TB test can remain positive after treatment. CDC instructions provide specific rules for documenting prior positive results and completed treatment.

Previous BCG vaccination

BCG vaccination is used in many countries to help protect against tuberculosis.

Unlike the TB skin test, an IGRA is not generally affected by prior BCG vaccination.

Do not assume that a positive QuantiFERON result is caused by childhood BCG vaccination.

What should you ask your civil surgeon after a positive TB result?

Before leaving your follow-up appointment, consider asking:

1. Do I need a chest X-ray?
2. Where should I complete the imaging?
3. Do my findings suggest latent TB or require further evaluation?
4. Will I need a health-department referral?
5. What documentation is required before my I-693 can be completed?
6. Should I discuss preventive TB treatment with my healthcare provider?

Keep copies of your test results, imaging reports and relevant treatment records.

Frequently asked questions

Can I pass my immigration medical exam with a positive TB blood test?

A positive blood test does not automatically prevent completion of the examination. The civil surgeon must complete the required evaluation and determine the appropriate classification.

Is latent TB contagious?

No. People with latent TB infection cannot spread TB bacteria to others.

Do I need TB treatment before receiving my I-693?

Applicants with latent TB infection generally do not need to complete preventive treatment for immigration status adjustment. Applicants diagnosed with infectious TB disease must satisfy different treatment and clearance requirements.

Can I skip the chest X-ray if I feel healthy?

No. A positive IGRA requires a chest X-ray under CDC civil-surgeon instructions, even if you do not have symptoms.

How long does TB follow-up take?

Timing depends on the required evaluation. A chest X-ray and review may be relatively straightforward, while health-department referrals and sputum cultures can require considerably more time.

Immigration medical exams in Indianapolis and surrounding communities

Lab On Demand provides immigration medical examination services in Indianapolis, Indiana, helping applicants understand the medical testing and documentation associated with Form I-693.

Our Indianapolis location may be convenient for applicants traveling from surrounding communities, including:

• Carmel

• Fishers

• Noblesville

• Westfield

• Zionsville

• Lawrence

• Greenwood

• Southport

• Plainfield

• Avon

• Brownsburg

• Beech Grove

These communities are listed as nearby areas from which applicants may travel to Indianapolis, not as separate Lab On Demand office locations.

If your immigration TB screening was performed at Lab On Demand, contact the office to discuss your results and the next step in your evaluation.

If another civil surgeon ordered your examination, begin with that practice to ensure follow-up remains connected to your existing I-693 record.