Based on the sources provided, there is no specific information regarding the accuracy of a blood test in detecting Cosentyx allergies. However, it is important to note that allergic reactions to medications like Cosentyx can vary in their presentation and severity.

Cosentyx (secukinumab) is a biologic medication used to treat various autoimmune conditions, including psoriasis and psoriatic arthritis [1]. Allergic reactions to medications can manifest in different ways, ranging from mild skin rashes to severe anaphylaxis [3].

To diagnose an allergic reaction to Cosentyx, healthcare professionals typically rely on a combination of patient history, clinical symptoms, and physical examination. In some cases, additional diagnostic tests such as skin prick tests or patch tests may be used to confirm the allergy [3].

Unfortunately, the sources provided do not specifically mention the use of blood tests for diagnosing Cosentyx allergies. However, it is worth noting that blood tests, such as specific IgE tests, can be helpful in diagnosing allergies to other medications [3]. These tests measure the presence of specific antibodies in the blood that are associated with allergic reactions.

It is important to consult with a healthcare professional if you suspect you may be allergic to Cosentyx or any other medication. They will be able to evaluate your symptoms, medical history, and determine the most appropriate diagnostic approach for your specific situation.

In conclusion, while the provided sources do not directly address the accuracy of blood tests in detecting Cosentyx allergies, it is advisable to consult with a healthcare professional for an accurate diagnosis. They will be able to evaluate your symptoms and medical history to determine the most appropriate diagnostic approach.

Sources:
[1] Drug Patent Watch. (n.d.). Cosentyx. Retrieved from https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] Medsafe. (n.d.). Cosentyx. Retrieved from https://www.medsafe.govt.nz/consumers/cmi/c/cosentyx.pdf
[3] National Center for Biotechnology Information. (2021). Allergic reactions to biologic agents: diagnosis and treatment. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9891841/