This test is mainly used for the serological treatment guidance of people who are allergic to dust, cockroaches, pollen and other antigens. The intradermal test is the most commonly used skin test. The scope of application is also wide. Almost all kinds of antigens and various types of reactions can be measured by intradermal test, but the time of different types of reaction observations and the standard of judgment results are different. Generally, multiple allergen tests are performed at the same time. The wheal was positive immediately after intradermal injection of allergen within 15 to 30 minutes; the infiltrative nodules were positive after 24 to 48 hours of intradermal injection. Positive is mainly seen in patients with exogenous allergic bronchial asthma.

Basic Information

Specialist classification: skin examination classification: blood examination

Applicable gender: whether men and women apply fasting: fasting

Analysis results:

Below normal:

Normal value:
no

Above normal:

negative:
Normal: negative.

Positive:
Generally, multiple allergen tests are performed at the same time. The wheal was positive immediately after intradermal injection of allergen within 15 to 30 minutes; the infiltrative nodules were positive after 24 to 48 hours of intradermal injection. Positive is mainly seen in patients with exogenous allergic bronchial asthma.

Tips: For infants under 1 year old, this method should be avoided and can be replaced by scratch test. Normal value

negative.

Clinical significance

Abnormal results are generally performed in a variety of allergen trials. The wheal was positive immediately after intradermal injection of allergen within 15 to 30 minutes; the infiltrative nodules were positive after 24 to 48 hours of intradermal injection. Positive is mainly seen in patients with exogenous allergic bronchial asthma.

Need to check the crowd of children, allergies.

Positive results may be diseases: sputum, pulmonary schistosomiasis, fungal allergic asthma, ascariasis, roundworm disease, bronchial asthma, hookworm disease considerations

Inappropriate people: infants within 1 year of age should avoid using this method and can be replaced by scratch test.

Taboo before inspection: Generally there are no taboo aspects.

Requirements for examination: Very few patients can develop anaphylactic shock during skin test, usually starting within a few seconds to 5 minutes after injection, first itching, numbness of the limbs, followed by shortness of breath, chest tightness, cyanosis, rapid heartbeat, fine pulse, Blood pressure drops, a lot of sweating, etc., if not rescued in time, can lead to patient death.

Inspection process

1. Test method After disinfecting the use site (two forearms or back), the diluted antigen 0.1m1 (first diluted antigen) is injected intradermally with a syringe. If multiple antigens are tested simultaneously, the lateral distance of each reagent Should be not less than 2.5cm, the longitudinal distance is not less than 5cm, no more than 10 tests at a time, and the same solvent must be used as a control.

2. Observation of the reaction 1 hour after the injection and 10 minutes after the injection, if the injection site occurs, it is positive; if the test is negative, it can be changed to a more concentrated antigen and re-tested.

Not suitable for the crowd

Taboo population: infants within 1 year of age should avoid using this method and can be replaced by scratch test.

Adverse reactions and risks

There are no related complications and hazards.