Giardia Test, Total Antibodies And ICD 10 Code

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Giardia Test, Total Antibodies And ICD 10 Code
Giardia Test, Total Antibodies And ICD 10 Code
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  • 1 How and where to get tested for lamblia?
  • 2 Preparation for analyzes

    • 2.1 Blood test
    • 2.2 Stool examination
  • 3 Analysis interpretation

In the presence of persistent dyspeptic disorders, giardiasis can be suspected (according to the ICD-10 ailment code A07.1). This is a protozoal disease that is provoked by lamblia, the smallest intestinal parasites. With proper treatment, complete recovery occurs. It is only important to diagnose this ailment in a timely manner. Blood and stool tests are usually done. In the blood serum, total antibodies to lamblia are determined, and protozoa are looked for in the feces.

How and where to get tested for lamblia?

get tested for lamblia
get tested for lamblia

What is giardiasis, we described above. ICD code 10 - A07.1. A negative test result for giardia in a child or adult does not mean that the disease is absent. To obtain a reliable result, you need to donate blood to Giardia repeatedly.

You can get tested for giardiasis in adults and children in private laboratories or government clinics. It is most likely that in any laboratory blood for lamblia is donated for a fee, since special equipment is required for the study.

In addition, the analysis for Giardia can be carried out through the study of feces. If we talk about which test is more informative, then a blood test for Giardia is considered the most effective. To identify cysts of lamblia, you need to take a stool test many times.

Preparation for analyzes

blood test for giardiasis
blood test for giardiasis

In order for a blood test for giardiasis in children and adults to be as accurate as possible, it is worth following a few simple rules before submitting it:

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  1. A week before delivery, you must stop using antihelminthic drugs, as well as antibacterial agents such as Trichopolum and Metronidazole. From antacids it is worth giving up Smecta. It is advisable not to drink any medicines at all, since the analysis for lamblia will be unreliable.
  2. A blood test for antibodies to lamblia antigens is carried out on an empty stomach. For this, the patient's venous blood is taken.
  3. If giardia is suspected, stool samples are collected from a single portion at different locations (usually six or seven). If we talk about how to get tested for lamblia in feces, then fresh test material is placed in an airtight container and delivered to the laboratory within a couple of hours. Better to collect your morning feces. The faster you deliver the feces, the easier it will be for a laboratory technician to detect vegetative forms of the parasite. Cysts can only be detected within 12 hours.

Blood test

blood test
blood test

We looked at how to get tested for giardiasis, now it's time to study their specifics. A blood test for lamblia is based on the detection of antibodies in the blood, their second name is immunoglobulins. If we talk about what an immunoglobulin is, then these are specific antibodies that our immune system produces in response to the parasite's antigens.

An antibody test for giardia igm will be informative from the second week from the moment of infection. Their appearance in the results of the study indicates a recent infection. But over time, the titer of these antibodies decreases, however, from the second or third week, you can do a blood test for antibodies to lamblia igg. These immunoglobulins remain in the blood serum for some time after treatment, so if tests are done for Giardia in children to assess the effectiveness of treatment, the igg antibody titer is not taken into account.

The body's response to the lamblia antigen in the blood depends on various factors:

  • the intensity of infection;
  • the state of the immune system;
  • stages of the disease (in the chronic course of antibodies may be absent).

Stool examination

fecal examination
fecal examination

More reliable results are obtained in the study of feces. For this, the material under study is examined under a microscope for the detection of cysts and live individuals. A positive result is confirmation of the preliminary diagnosis, but a negative result is not a sign of absence of disease. This is due to the fact that in the life cycle of these parasites there are periods from one to 17 days when cysts are not secreted.

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Stool microscopy is less informative in comparison with the PCR technique for examining stool masses. The accuracy of such a study reaches 98%, since it is not the parasite cysts that are searched in the feces, but fragments of its DNA. That is why the diagnosis will be effective even in the blind period, when the parasite does not produce cysts.

Decoding analysis

analysis transcript
analysis transcript

If a blood test was made for lamblia, decoding is performed by comparing the obtained values ​​with the norm for these indicators. The lower limit of the norm is within 1/100. The results are interpreted as follows:

  1. If the results are below this indicator, then this indicates the absence of invasion;
  2. If the values ​​are higher than normal, then they speak of the presence of giardiasis;
  3. With numbers equal to 1/100, they speak of an ambiguous result. In this case, the analysis must be repeated.

The positivity rate for giardiasis is necessarily assessed. It indicates the concentration of antibodies in the blood serum:

  • if IgM> 1 or less than two, and immunoglobulins of the IgG type are absent, then they speak of the onset of the disease;
  • if IgM = 2, and cysts are found in the feces, this indicates giardiasis in the acute stage;
  • chronic giardiasis is diagnosed in the absence of cysts in the feces and IgM antibodies, if the IgG immunoglobulins are within 1-2.

As for the study of feces, the complete absence of cysts of parasites in feces is considered the norm. However, a negative result is not a confirmation of the absence of parasites, so the test is repeated several times. The result of PCR is positive for detecting lamblia DNA in feces and negative in their absence.

It is important to remember that none of the methods listed above gives a 100% accurate result. That is why, to make the final diagnosis, they rely on the results of a comprehensive study and data from several diagnostic techniques.

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