A blood test for ascaris IgG helps to determine damage to the human body by causative agents of ascariasis. Ascariasis can be diagnosed using:

• microscopic examination (fecal samples - detection of roundworm eggs);
• determination of IgG antibodies to ascaris - (serum analysis).

A false-negative result is possible with a microscopic examination, since the analysis is performed using a microscope. Negative results of the analysis of feces for ascaris can be associated with invasion by male individuals, sexually immature or old female individuals of parasites. There is also a possibility that the eggs of the parasite did not get into the portion of feces for examination, since roundworms lay eggs erratically.
The second option for detecting the parasite is a specific blood test (enzyme-linked immunosorbent assay (ELISA)) for IgG antibodies to ascaris, which is based on the detection of the body's reaction to the presence of the causative agent Ascaris lumbricoides. The positive side of the method is the exclusion of errors due to the human factor, the possibility of detecting helminths in the preclinical stage of the disease. A sharp increase in the number of eosinophils is most often noted in the clinical blood analysis.

Indications for analysis:

• general malaise and weakness;
• decreased appetite;
• prolonged low fever;
• allergic reactions, skin rash;
• nausea, discomfort and/or abdominal pain;
• digestive disorders (constipation or diarrhea);
• sleep disturbance;
• persistent cough

Analysis of Giardia AT in total helps to determine the damage to the human body caused by giardiasis.

Indications for analysis:

• allergic reactions;
• chronic gastrointestinal diseases;
• abdominal pain, more often in the epigastric region;
• "traveler's diarrhea";
• immunosuppression;
• diseases of the upper respiratory tract;
• lag in physical development;
• skin diseases;
• persistent blood eosinophilia.

Giardiasis can be diagnosed in two ways:

• microscopic examination of bile, feces;
• immunoenzymatic analysis of blood (blood serum) for the presence of giardia antibodies.

Giardiasis is diagnosed by microscopic analysis of detection of cysts or trophozoites of giardia in samples of feces or duodenal contents. The efficiency of these methods is about 50% due to the characteristic discontinuity in cyst secretion, associated with the peculiarities of the reproduction of trophozoites of giardia. The detection of antibodies to Giardia antigens significantly complements the methods aimed at detecting Giardia in feces, although this test is also not always sensitive enough. It is advisable to carry out the test 10-14 days after the onset of symptoms, if the previous tests gave a negative result.
An immunoenzymatic blood test is also used to detect giardia antibodies.