Background In the 5 years that have passed since the publication of the 2018 International Consensus Statement on Allergy and Rhinology: Allergic Rhinitis (ICAR‐Allergic Rhinitis 2018), the literature has expanded substantially. The ICAR‐Allergic Rhinitis 2023 update presents 144 individual topics on allergic rhinitis (AR), expanded by over 40 topics from the 2018 document. Originally presented topics from 2018 have also been reviewed and updated. The executive summary highlights key evidence‐based findings and recommendation from the full document. Methods ICAR‐Allergic Rhinitis 2023 employed established evidence‐based review with recommendation (EBRR) methodology to individually evaluate each topic. Stepwise iterative peer review and consensus was performed for each topic. The final document was then collated and includes the results of this work. Results ICAR‐Allergic Rhinitis 2023 includes 10 major content areas and 144 individual topics related to AR. For a substantial proportion of topics included, an aggregate grade of evidence is presented, which is determined by collating the levels of evidence for each available study identified in the literature. For topics in which a diagnostic or therapeutic intervention is considered, a recommendation summary is presented, which considers the aggregate grade of evidence, benefit, harm, and cost. Conclusion The ICAR‐Allergic Rhinitis 2023 update provides a comprehensive evaluation of AR and the currently available evidence. It is this evidence that contributes to our current knowledge base and recommendations for patient evaluation and treatment.

Serum total IgE level is useful in the in vitro diagnosis of allergic rhinitis. In vitro testing for specific IgE may be unnecessary in patients with low serum total IgE, whereas high total IgE level suggests that in vitro testing would confirm specific sensitizations in patients with allergic rhinitis.

Purpose of Review To summarize and review recent literature on the role of allergen immunotherapy in the setting of a worldwide pandemic. Recent Findings At the start of the SARS-CoV-2 pandemic, most elective ambulatory patient care services, including allergen immunotherapy, were suspended. Now with medical practices reopening, allergists must establish plans and protocols for resuming care of allergy patients, including strategies for restarting allergen immunotherapy. While there are no published evidence-based protocols for resuming allergen immunotherapy, limited scientific data and expert opinion suggest that the major factor in dose adjustment is the time elapsed from the last dose. Summary Resuming outpatient allergy services in the setting of the COVID-19 pandemic poses many challenges to the practitioner. Allergy specialists are now faced with developing prudent and evidence-based strategies for safely resuming allergen immunotherapy, while also maintaining a safe environment for staff and patients.