skin prick test

The skin prick test is to drop a small amount of highly purified allergen liquid onto the forearm of the patient, and then gently puncture the surface of the skin with a pricking needle. If the patient is allergic to the allergen, a red bump resembling a mosquito bite appears in the puncture site within fifteen minutes, an itchy reaction occurs, or the color changes. We are basically able to compare the existence of allergic diseases. The skin spot test is now the most convenient, economical, safe and effective allergen diagnosis method in European countries and the United States. Its advantages are high safety and sensitivity, and patients have no pain, just like mosquitoes, and patients and doctors. You can know the test results immediately. Basic Information Specialist classification: skin examination classification: immune examination Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: normal. Positive: No relevant information. Tips: Those with a history of anaphylactic shock are forbidden to perform such tests, and try to avoid examination during pregnancy. Normal value The reaction was negative. Clinical significance Abnormal results lead to local telangiectasia (erythema), increased capillary permeability (edema, wheal), and positive individuals are allergic to the antigen. The people in need of examination are adapted to patients with urticaria, papular urticaria, atopic dermatitis, drug eruption, allergic rhinitis, and asthma. The skin prick test uses histamine as a positive control to calculate the relative reaction intensity and is a method for effectively determining the atopy of allergic skin diseases (sensitive to one or more allergens). Positive results may be diseases: pediatric food allergy, pediatric Behcet's disease, pediatric drug dermatitis, corpus callosum keratosis, allergic eczema, pediatric drug allergy, allergic vaginitis precautions Inappropriate people: Those with a history of anaphylactic shock are forbidden to perform such tests, and try to avoid examination during pregnancy. Before the examination, the glucocorticoids, adrenergic drugs, antihistamines, jaundice drugs, sodium cromoglycate and other drugs were stopped 24 hours before the examination. Requirements for examination: 1 should be carried out in the absence of clinical symptoms; 2 should be set with saline and histamine as negative and positive control; 3 when the result is negative, should continue to observe 3 to 4 days, if necessary, 3 to 4 weeks Repeat the test; 4 should prepare adrenaline injection to rescue possible anaphylactic shock. Inspection process Stinger: Use a disposable puncture needle. Reagents: Allergen puncture fluids include: (1) histamine (positive control solution); (2) normal saline (negative control solution); (3) house dust mite; (4) dust mite; (5) feather; 6) flowers; (7) sea crabs; (8) sea fish; (9) latex; (10) cigarettes; (11) scutellaria; (12) milk. Operation steps: (1) Select the skin of the left forearm palm side for pricking. (2) Mark the name of the pricking liquid used in the middle of the left arm with a marker. The distance between the two punctures is not less than 5 cm to prevent the reaction from blushing; disinfect the skin. (3) Drop 1 drop of various pricking liquid from bottom to top (larger than the tip of the needle). (4) Using a disposable disinfection point, the needle is placed vertically in each droplet, and the skin is punctured by light pressure (without bleeding). After 1 second, it is discarded and discarded. After 5 minutes, all the droplets are wiped off for 30 minutes. After the skin reaction was observed and recorded. Judging criteria for positive results: the response level is determined by the ratio of wheal area caused by allergen and histamine (positive control solution), and the response is the same as the negative control (-), and the ratio is histamine wheal (positive). Control) 1/4 or more is (+), equal to or greater than 1/2 of the positive control range is (++), equal to the positive control (+++), and greater than 2 times of the positive control range (+ +++). Not suitable for the crowd Contrained people: Those with a history of anaphylactic shock are forbidden to perform such tests, and try to avoid examination during pregnancy. Adverse reactions and risks There are no related complications and hazards.