CPT® Code 87336

1. Indications

The CPT® Code 87336 is indicated for the detection of antigens related to the Entamoeba histolytica dispar group in fecal samples. This test is performed under the following circumstances:

• Abdominal Pain Patients presenting with abdominal pain that may suggest an underlying parasitic infection.
• Diarrhea Individuals experiencing diarrhea, particularly when associated with potential exposure to contaminated food or water.
• Potential Exposure Cases where there is a history of sexual transmission or ingestion of contaminated substances that could lead to infection.
• Diagnostic Confirmation To confirm a diagnosis of Entamoeba histolytica infection, especially in symptomatic patients.

2. Procedure

The procedure for conducting the test under CPT® Code 87336 involves several key steps, which are outlined as follows:

• Sample Collection A fecal sample is collected from the patient. This sample can either be placed in a fixative to preserve the integrity of the specimen or sent fresh to the laboratory for immediate processing.
• Preparation of the Sample In the laboratory, the fecal sample is prepared for analysis. This may involve homogenizing the sample to ensure that any antigens present are evenly distributed for accurate testing.
• Immunoassay Technique The prepared sample undergoes testing using one of the immunoassay techniques, such as EIA, ELISA, FIA, or IMCA. Each of these methods utilizes specific antibodies that bind to the Entamoeba histolytica dispar antigens if they are present in the sample.
• Detection of Antigen In the case of EIA and ELISA, a secondary enzyme-labeled antibody is added to the sample. This antibody binds to the antigen-antibody complex, and a chromogenic reaction occurs, resulting in a color change that can be measured. For FIA, a fluorescent compound is used to detect the binding of the antibody to the antigen, while IMCA employs a chemiluminescent substance to quantify the antigen-antibody complex through light emission.
• Result Interpretation The results of the test are assessed qualitatively or semi-quantitatively based on the colorimetric readings or fluorescence emitted, indicating the presence or absence of the antigen in the sample.

3. Post-Procedure

After the completion of the test, the laboratory will analyze the results and report them to the requesting physician. The interpretation of the results will guide further clinical management and treatment decisions. If the test is positive, it may indicate an active infection with the Entamoeba histolytica dispar group, necessitating appropriate therapeutic interventions. In cases of negative results, further investigation may be warranted if clinical symptoms persist. It is essential for healthcare providers to consider the patient's clinical history and symptoms in conjunction with the test results for accurate diagnosis and treatment planning.