It is similar to a scratch, but because we lift the skin with the tip of the needle, the hole is deeper and more substances penetrate into the skin, and the results are repeatable.
This method is common and standard today, which can be done after cleaning the skin with alcohol and drying it, then marking the test locations with a pen – which are at least 2 cm apart – and then performing the prick operation with a pricker.
Or one person can do the piercing first and another person can put drops in the same place.
Every time the piercing operation is done, it is necessary to completely clean the tip of the needle so that the materials do not mix with each other and also try not to make the drops so big that they flow and enter the next holes.
Histamine control test should be at least 4-5 cm away from other tests and should be done with a special needle in the arm.
Before performing the skin test, ask about not taking antihistamines for 48 hours and nerve drugs for 4 days.
Ask about the patient’s reaction to the needle or blood, and if they are in a state of fainting or anxiety, talk to the patient and perform the test in a lying position and keep the patient lying down for 5 minutes after the end of the test.
If it responds very strongly and quickly to histamine and reacts to normal tests earlier than 5 minutes or if the reaction is strong, we identify the person as very sensitive.
Individuals who react negatively to the control are identified as hypersensitive skin dermographia.
The best place to do a prick test:
A) upper back
b) lower back
c) Arm
d) Forearm on the side of the little finger
e) The forearm is on the side of the big finger and it is also the worst place near the wrist.
SPT: It is one of the older types (1865) of the skin test, which is the best, most conceptual, but qualitative.
The most common and common skin test is the prick, which has two types
Single Pricker (a) which can be Single Point or Multiple Point, which better enters an extract into the skin.
Multiple Pricker (b or Multiple Test, which simultaneously injects 6 or 8 different allergen extracts into the skin. In Multiple Test, it is more uniform and deeper.
In addition to being reproducible, it also has high validity, so that it is the most practical screening method. Screening. The prick test requires a + or – control. We perform a + or histamine control to determine the reaction conditions of a person’s skin, which can be detected if he has taken a specific drug or has naturally sensitive skin. Attention to millimeter differences in histamine reaction can be graded.
If a person does not respond to histamine, it is necessary to use a skin test for him.
Control – use of normal saline or other diluting substances include phenol and glycerin, which in addition to identifying people with dermographism, can identify the effects of said substances in causing skin reactions specific to themselves.