Journal List > J Rhinol > v.24(2) > 1044397

Dong, Jung, Min, Kim, Lee, Cho, and Kim: Difference according to Interpretation Methods in Allergic Skin Test

Abstract

Background and Objectives:

The skin prick test is a widely used test that uses three methods (allergen/histamine ratio method, erythema size method, and wheal size method) to interpret the results. However, there has been no comparison of these methods. The aim of this study is to compare the three different interpretation methods and define the relationship among them. Subjects and Method: A total of 139 patients who visited our allergy clinic complaining of nasal symptoms were enrolled. Three interpretation methods were used for defining positivity in the skin prick test, and their results were compared. The valid-ity of each interpretation method was evaluated by total nasal symptom score.

Results:

Positivity in the skin prick test was reported in 48.2% of patients according to the allergen/histamine ratio method and in 64.0% of patients according to the wheal size method and erythema size method. The proportion of subjects who showed a negative result with the allergen/histamine ratio method but positive results with the wheal size method or erythema size method was 15.8%. This group had a significantly higher total nasal symptom score, especially rhinorrhea and nasal obstruction, than subjects who showed negative results on all three methods.

Conclusion:

When diagnosing allergic rhinitis patients using the skin prick test, the wheal size method and erythema size method should be considered rather than the allergen/histamine ratio method.

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Table 1.
Negative and positive result of 3 different methods
Allergen/Histamine ratio method n (%) Wheal size method n (%) Erythema size method n (%)
Negative result 72 (51.8%) 50 (36.0%) 50 (36.0%)
Positive result 67 (48.2%) 89 (64.0%) 89 (64.0%)

: Eryrthema size method and wheal size method had the same results

Table 2.
Total nasal symptom score of allergen/histamine ratio method
Rhinorrhea Nasal obsturction Itching Sneezing Total
Negative result 1.75±1.10 2.14±1.06 1.32±1.07 1.41±1.10 6.62±3.46
Positive result 2.10±1.07 2.35±0.89 1.96±0.97 1.97±0.96 8.38±3.06
p 0.055 0.205 <0.001 0.002 0.002

: p<0.05

Table 3.
Total nasal symptom score of Wheal size method and erythema size method
Rhinorrhea Nasal obsturction Itching Sneezing Total
Negative result 1.52±2.15 1.92±1.14 1.22±1.11 1.32±1.19 5.98±3.62
Positive result 2.14±1.02 2.43±0.84 1.87±0.97 1.88±0.95 8.33±2.92
p 0.002 0.003 0.001 0.004 0.000

: p<0.05

: Eryrthema size method and wheal size method had the same results

Table 4.
Distribution of three different method ( Allergen/Histamine ratio method, wheal size method, and erythema size method)
Allergen/Histamine ratio method Erythema size method & Wheal size method n (%) Group
- - 50 (35.9%) Group N
- + 22 (15.8%) Group D
+ - 0
+ + 67 (48.2%) Group P

: There were no patients who had positive results on allergen/histamine ratio method and negative results on erythema size method and wheal size method,

: Eryrthema size method and wheal size method had the same results

: Group N (Negative): negative result in three different methods, Group P ( Positive): positive result in three different methods, Group D ( Discrepancy): negative result in Allergen/Histamine ratio method, but positive results in wheal size method and erythema size method

Table 5.
Total nasal symptom scores of Group N, P, and D
Group N Group P Group D p value
Rhinorrhea 1.52±1.11 2.11±1.06 2.23±0.92 0.011
Nasal obstruction 1.92±1.14 2.36±0.90 2.64±0.58 0.007
Itching 1.22±1.11 1.97±0.97 1.54±0.91 0.232
Sneezing 1.32±1.18 1.98±0.96 1.59±0.85 0.338
Total 5.98±3.62 8.43±3.05 8.00±2.51 0.021

: p<0.05,

: Difference between Group N and Group D

: Group N ( Negative): negative result in three different methods, Group P ( Positive): positive result in three different methods, Group D ( Discrepancy): negative result in Allergen/Histamine ratio method, but positive results in wheal size method and erythema size method

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