Secretory IgA (Stool)
Secretory IgA is an antibody that lines the gut and forms part of the mucosal immune defense. Measuring it in stool is meant to reflect immune activity at the intestinal surface.
Because secretory IgA is a frontline barrier against microbes in the gut, some practitioners use it as a general marker of mucosal immune status. It's worth knowing that reference ranges and clinical interpretation of stool secretory IgA are not well standardized.
A high level is sometimes interpreted as heightened immune activity in the gut, perhaps in response to an infection or inflammation. This interpretation is not firmly established, so an elevated result is best viewed as a prompt for discussion rather than a diagnosis.
A low level is sometimes read as a weaker mucosal immune barrier, but the clinical meaning of a low stool result is uncertain and should be interpreted cautiously.
There is no widely agreed-upon target for stool secretory IgA. Any result is best discussed with a knowledgeable clinician who can weigh it against your overall picture.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.