Phadia’s GX1 test is used to detect blood levels of IgE (antibodies) responsible for allergic reactions such as hay fever (rhinitis, conjunctivitis, asthma) to 5 different grasses: perennial ryegrass, common timothy, meadow ryegrass, orchard grass and Kentucky blue grass. These grasses grow in the wild or are cultivated as feed crops. The interpretation chart accompanying the result expresses the probability of an allergic reaction to these 5 grasses, but not necessarily the severity of the reaction. Case history (symptoms, relation to season, etc.) and clinical examination by the physician are essential for a reliable interpretation of the results.
An anti-grass mix 1 IgE result below 0.35 kilounits per litre (< 0.35 kU/L) indicates that the 5 tested grasses are probably not responsible for the symptoms reported by the person, but it DOES NOT COMPLETELY RULE OUT THIS POSSIBILITY. In the event of a positive result and for avoidance or desensitization purposes, it may be appropriate to separately identify which of the 5 grasses is responsible for the allergic symptoms.