Most applicants expect their immigration medical exam to end in one of two ways: a clean bill of health, or a finding that needs treatment. There is a third outcome that catches people off guard, and it shows up more often than the paperwork suggests. A lab test comes back neither clearly positive nor clearly negative — it comes back indeterminate, sometimes labeled equivocal. Understanding what that means for your Form I-693, and what your civil surgeon is and is not permitted to do about it, can save you a confusing follow-up call and a lot of unnecessary worry.
What “Indeterminate” Actually Means
An indeterminate result is a laboratory outcome, not a medical diagnosis. Some tests used during the immigration medical exam — most commonly the interferon-gamma release assay (IGRA) blood test for tuberculosis — produce a control-value range that the assay itself cannot resolve into a clean positive or negative reading. The lab is not saying you are sick or well. It is saying the sample did not behave in a way the test can classify. Equivocal results on other screenings, such as an initial nontreponemal syphilis test, work on a similar principle: the specimen produced a borderline reactive signal that needs a second, more specific test to interpret.
This distinction matters because an indeterminate test result is not itself a Class A or Class B finding. Those two classifications describe conditions the civil surgeon has already evaluated and categorized under the U.S. health-related grounds of admissibility. An indeterminate lab value sits before that step — it is unresolved information, not a conclusion.
What the Civil Surgeon Is Required to Do
Civil surgeons follow CDC Technical Instructions when a screening test comes back indeterminate, and those instructions are more restrained than many applicants expect. For an indeterminate IGRA tuberculosis result specifically, the civil surgeon is directed to document the result exactly as indeterminate on Form I-693. The instructions do not authorize the civil surgeon to repeat the blood test, order a chest x-ray, or assign a Class B2 tuberculosis classification based on that indeterminate reading alone. The applicant may be advised to repeat testing later for their own health benefit, but that follow-up is a personal health recommendation, not a requirement of the immigration exam itself.
Syphilis screening follows a different but related logic. The exam starts with a nontreponemal test; if that comes back reactive or borderline, the result must be confirmed with a treponemal-specific test before the civil surgeon can document a definitive finding. Every test used to resolve these results has to be run through the civil surgeon’s own designated laboratory at the time of the exam — results from an outside lab, even a recent one, are not accepted as part of Form I-693.
How This Differs From a Class A or Class B Finding
It helps to see the three outcomes side by side, since applicants often conflate an unresolved lab value with an actual classification.
| Result type | What it means | Effect on your I-693 |
|---|---|---|
| Indeterminate / equivocal | The lab could not resolve the sample into a clear positive or negative | Documented as-is; does not by itself delay classification or trigger extra required testing |
| Class B condition | A departure from normal health that does not make you inadmissible (e.g., successfully treated syphilis, or latent TB with a negative chest x-ray and no symptoms) | Noted on the form; generally does not block your case |
| Class A condition | A condition that can make an applicant inadmissible (e.g., active tuberculosis or untreated infectious syphilis) | Typically requires treatment, or a waiver, before the case can move forward |
Why This Is a Frequent Source of Confusion
Applicants who see the word “indeterminate” on their paperwork sometimes assume it functions like a Class B finding, or worse, that it is a quiet way of flagging a problem the civil surgeon has not fully explained. Neither is accurate. An indeterminate result is a documentation entry describing what the laboratory instrument reported, nothing more. It does not carry the legal weight of a Class A or Class B designation, and a licensed civil surgeon is not permitted to treat it as though it did by ordering additional procedures the technical instructions do not call for.
Where confusion tends to compound is when an applicant expects the civil surgeon to “fix” the ambiguity on the spot. Because the immigration exam only accepts testing performed at the civil surgeon’s own designated laboratory, and because the technical instructions restrict what can be done with an indeterminate value in that specific visit, the honest answer for many applicants is that the result gets documented and the exam proceeds. Any further testing an applicant chooses to pursue for personal health reasons happens on its own timeline, separate from the immigration paperwork.
What to Do If You Get an Indeterminate Result
Ask your civil surgeon directly which test produced the indeterminate reading and whether CDC guidance treats that particular test differently from a standard positive or negative. Not every screening in the exam handles ambiguity the same way, and the rules for a tuberculosis blood test are not identical to the rules for a syphilis screen. Keep a copy of whatever documentation you are permitted to retain, and if a licensed provider recommends repeat testing for your own health, treat that as separate from — not a substitute for — the process your civil surgeon has already followed correctly.
Conclusion
An indeterminate test result on your immigration medical exam is unresolved lab data, not a verdict. It is not the same as a Class A or Class B classification, and CDC Technical Instructions specifically limit what a civil surgeon can do with it in the moment it appears. Knowing that distinction going in makes an already stressful appointment easier to sit through, and it helps you ask sharper questions if the topic comes up during your own exam.