Nov 20, 2018, 8:50 AM
Allergy testing is the first and most crucial step in treating allergy conditions. While the test can be performed year-round, some seasons are better for testing than others.
Serum allergy tests measure the amount of allergen-specific IgE (immunoglobulin E) in a patient’s bloodstream to pinpoint the offending environmental allergens causing their allergy symptoms. IgE serum concentrations are often determined by allergen pollen counts. So, it is helpful to conduct testing when IgE levels are more pronounced.
Why Timing Matters
Peak allergy season typically varies by allergen type but generally occurs during the changing of the season. In most parts of the world, peak tree pollen season usually ranges from wet to dry season, grass pollen season reaches its height during the dry season months, while weed pollen season runs from the beginning of the wet season. As pollen counts for environmental allergens tend to peak around summer, testing for allergies during this time can enhance the probability of successfully identifying problematic allergens.
Although, the temperate seasons do not apply to the Gulf Region, and the variety of trees, grass and weeds are not endemic to the area, the Middle East is a transcontinental region, centered between Western Asia and Northeast Africa, with dry summers and mild winters (Mansouritorghabeh, et al.2017). These conditions are perfect for pollens to travel further inland with warm, dry and windy conditions, which tends to occur as the season changes. Thus leading to an increased prevalence of allergic/atopic conditions around the months when sandstorms and the occasional rainfall happens
IgE antibodies are the shortest lived, least abundant immunoglobulin in the serum (Smith and Ownby, 2009). During non-seasonal allergy months, IgE concentrations tend to decrease. The body metabolizes older antibodies and the antibody production rate is drastically reduced. When antibody titers are low, serum allergy testing may not be ideal, as it is more difficult to identify problematic allergens.
When allergy season starts and pollen count levels begin to increase, the production of allergen-specific IgE also increases. This surge in IgE is spurred by several cell types, including regulatory T-cells and a specialized class of circulating B-cells (called “memory cells”). When allergens are detected, the regulatory T-cells generate chemical mediators (called cytokines). Those chemical mediators stimulate the memory cells to produce IgE. As the name implies, memory cells retain the information for the allergen-specific IgE- production and create these specific antibodies at the appropriate time (He et al.,2017).
When pollen counts are high, allergen-specific IgE is made, resulting in a greater IgE concentration in serum. This process allows for a more accurate serum allergy diagnosis, as higher concentrations of allergen-specific IgE lead to easier detection.
The first step in choosing a proper course of treatment for allergy conditions is diagnosis. Next, be aware of the season when the test is performed. Although antibodies are present throughout all seasons, IgE concentrations are highest during peak allergy seasons. Late spring to early fall tends to have higher pollen counts for most environmental allergens, including grasses, weeds, and trees. Therefore, this time of the year is ideal to perform serum allergy testing. For both pet parents and veterinarians, receiving the most accurate allergy diagnostic results is key to effectively treating and relieving the patient’s discomfort.
References: Smith P, Ownby DR. “Clinical significance of IgE.” In: Adkinson N, Bochner BS, Busse WW, Holgate ST, Lemanske RF, Simons FER, editors. Middleton’s allergy: principles and practice. 7th ed St Louis: Mosby Elsevier; 2009.
He J-S, Subramaniam S, Narang V, Srinivasan K, Saunders SP, Carbajo D, Wen-Shan T, Hamadee NH, Lum J, Lee A, Chen J, Poidinger M, Zolezzi F, Lafaille JJ and Curotto de Lafaille MA. “IgG1 memory B cells keep the memory of IgE responses.” Nature Com, 8:1-12, 2017
Mansouritorghabeh H, Jabbari-Azad F, Sankian M, Varasteh A, Farid-Hosseini R. “The Most Common Allergenic Tree Pollen Grains in the Middle East: A Narrative Review”. Iran J Med Sci. April 2017