Latent TB vs. Active TB: A Critical Distinction

A positive TB test result can indicate either latent TB infection (LTBI) or active TB disease. These two conditions have very different implications for the immigration medical examination and the I-485 adjudication.

Latent TB means the TB bacteria are present in the body but are not causing active disease. The person is not contagious and typically has no symptoms. Active TB means the bacteria are actively multiplying and causing disease. The person may be contagious and typically has symptoms such as cough, fever, and weight loss.

Latent TB: Class B Condition

Latent TB is classified as a Class B condition on Form I-693. Class B conditions are not grounds of inadmissibility — they do not prevent approval of the I-485. However, USCIS requires documentation of the finding and may request evidence of follow-up care or treatment.

Clients with latent TB will typically be referred to a local health department or physician for evaluation and possible treatment. Treatment for latent TB typically takes 3–9 months and significantly reduces the risk of developing active TB.

Active TB: Class A Condition

Active TB is classified as a Class A condition on Form I-693. Class A conditions are grounds of inadmissibility and can prevent approval of the I-485 until the condition is resolved.

Clients with active TB must complete treatment before the I-485 can be approved. Treatment for active TB typically takes 6–12 months. Once treatment is completed, the civil surgeon can update Form I-693 to reflect the resolved condition.

Documentation USCIS Requires

For clients with TB findings, USCIS typically requires:

• Form I-693 documenting the TB test result and classification (Class A or Class B)
• Chest X-ray results (required for positive TB tests)
• For active TB: documentation of treatment completion from a licensed physician
• For latent TB: documentation of referral for evaluation and, if treatment was initiated, treatment records
• Follow-up Form I-693 after treatment completion (for Class A conditions)

Timeline Impact

TB findings can significantly delay the adjudication of an I-485. For latent TB, the delay may be minimal if the client is referred for evaluation promptly. For active TB, the delay can be 6–12 months or longer while treatment is completed. Attorneys should advise clients of these potential delays and set realistic expectations.