What does the blue allergen vial indicate (vol/vol)?

The blue allergen vial typically indicates a concentration of 1:100 volumetrically. In allergen immunotherapy, allergen extracts are prepared at different dilutions, and these colors and volumes help practitioners identify the potency of the extracts being used for the patient.

In this case, a 1:100 dilution means that one part allergen is mixed with 99 parts diluent, resulting in a relatively strong concentration compared to other vials. This specific designation assists healthcare providers in administering the appropriate dosage based on the patient's desensitization needs and their response to treatment. Understanding these concentrations is crucial for ensuring patient safety and effectiveness of allergen immunotherapy.