This analysis can not be used as a tuberculin, as a result of administration does not cause a hypersensitivity reaction. Therefore, it does not apply to the selection of persons for revaccination of BCG.
Most often this test is carried out in a complex of studies, such as X-ray and clinical-laboratory, which make it possible to diagnose "tuberculosis . "
What results can be observed after the conducted diaskintest?
Conducting this kind of sample is carried out exclusively in the conditions of the medical institution and only for the purpose of the phthisiatrician. The drug Diaskintest is administered to children intradermally, and after 3 days (72 hours) the result is evaluated.
In this case, it is customary to highlight the following options for assessing the result of Diaskintest in children:
- negative;
- positive;
- doubtful.
A negative test is recognized when the red spot is completely absent, as well as a papule-like seal, or an infiltrate, is not observed. At the test site, there is only a trace from the injection.
If there is only one red spot at the injection site, the diameter of which is 2-4 mm, the test is considered doubtful. In this infiltration and even a small swelling is completely absent.
If the diameter appearing at the site of the swelling injection is 5 mm or more, the result of Diaskintest is considered positive. This is how the Diaskintest results are evaluated in children. Often, when assessing the results of a diaskintest, doctors note the presence of a bruise.
Also, there may be observed, so-called, hyperergic phenomena after injection. They are characterized by the formation of seals on the surface of the skin, whose diameter is 15 mm and even more, as well as the appearance of vesicles and in some cases ulceration.
With this result, the child is hospitalized and he is given treatment, after which he is on a follow-up visit throughout his life.
How to determine the skin reaction to the drug?
A doctor who knows how to do this can evaluate the result of a diaskintest. In this case, it is customary to distinguish the following skin reactions to drug administration:
- mild, when the skin has an infiltrate, the size of which does not exceed 5 mm in diameter;
- moderately pronounced, - the size of the infiltrate varies between 5-9 mm;
a pronounced reaction is called the appearance of an infiltrate with a size of 10 mm or more.
It does not seem strange, but the results of Diaskintest are evaluated as well as the Mantoux samples , i.e. using a conventional ruler. Therefore, to call it an innovative diagnostic tool, can be a great stretch.
Thus, the parents, knowing what the result of the diaskintest should be in the norm, will not be more concerned about this. In any case, only one result of this test is not diagnosed. For this, additional examinations are needed, using an x-ray machine, as well as laboratory studies.