Effective therapy of giardiasis should be followed by a number of clinical and laborator findings.
Criteria of therapeutic response in a patient being treated for giardiasis:
(1) resolution of clinical symptoms
(2) absence of cysts and trophozoites in clinical specimens
(3) negative tests for Giardia antigens on stool
The presence of persistent symptoms despite absence of physical evidence for giardia suggests that symptoms may be due to another cause. This diagnosis assumes that testing was adequate and sufficient samples were examined.
The presence of persistent evidence of Giardia during and following therapy indicates refractory disease (see next section).
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