Anaphylaxis is a potentially fatal acute systemic allergic reaction. It is becoming increasingly common. [1, 2] Multiple studies have shown that anaphylaxis is both under-recognized and under-treated. [3–5]

Anaphylaxis is known to have varied presentations involving different organ systems. There are no universally accepted criteria for diagnosis of anaphylaxis. Lack of standardized diagnostic criteria has hampered diagnosis and management of anaphylaxis. The National Institute of Allergy and Infectious Disease and the Food Allergy and Anaphylaxis Network (NIAID/FAAN) organized an international symposium in 2005 at which new diagnostic criteria for anaphylaxis were proposed. Although not prospectively validated, these criteria provide physicians with a rapid and simplified means of making the diagnosis.

Traditionally, the term ‘anaphylaxis’ referred to life-threatening manifestations of allergic reactions, such as respiratory distress or shock (anaphylactic shock) as manifested by hypotension or signs of hypoperfusion of critical organs. However, there is now a growing consensus that anaphylaxis is a systemic allergic reaction that typically involves more than one organ system but rarely can present with cardiovascular compromise as the only symptom. Therefore, the new criteria will capture broader presentations, encompassing less severe manifestations.

The importance of recognition and diagnosis of mild presentations of anaphylaxis (for example, rash and vomiting after an allergen exposure) is underscored by a study by Pumphrey. [6] In this study of 139 fatalities due to anaphylaxis, 78% of deaths attributed to food allergy, and 82% of deaths attributed to venom allergy occurred in patients with no previous history of severe allergic reactions. These fatalities might have been prevented if the previous less severe presentations had been recognized and patients had been provided with self-injectable epinephrine and appropriate follow-up referrals.

Table 1 shows the NIAID/FAAN criteria. [7] Patients are likely to have anaphylaxis if any one of the three criteria is present. It was believed that the criteria would “capture more than 95% of cases of anaphylaxis”. [7]

Table 1 National Institute of Allergy and Infectious Disease and Food Allergy and Anaphylaxis Network criteria for anaphylaxis
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We present a user-friendly visual representation (Fig. 1) of the NIAID/FAAN criteria so as to enhance, not only recognition of anaphylaxis, but also active teaching and learning of these criteria among health-care providers. Increased recognition and diagnosis of anaphylaxis will hopefully lead to improved management and better outcomes in patients suffering from anaphylaxis.

Fig. 1
figure 1

Visual representation of the National Institute of Allergy and Infectious Disease and Food Allergy and Anaphylaxis Network criteria for anaphylaxis

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