What investigation is typically performed post-anaphylaxis?

In the context of post-anaphylaxis management, the correct investigation is typically a serum electrolytes test. After an anaphylactic reaction, individuals can experience significant physiological changes, including alterations in electrolyte levels due to factors such as cardiovascular instability, changes in fluid balance, and potential renal impairment. Monitoring serum electrolytes helps in assessing the patient's metabolic status and guiding further management.

While a chest X-ray may be useful in other medical contexts to address respiratory concerns, it is not a routine investigation after anaphylaxis unless there are specific respiratory complications or other indications. Similarly, urinalysis and complete blood count may be conducted in various situations to gather different types of information, but they are not standard investigations following anaphylaxis. The focus post-anaphylaxis is primarily on stabilizing the patient and monitoring vital parameters, including electrolytes, to prevent complications.