Performances of an Improved Device for Skin Prick Tests

Every day allergists deal with skin prick testing. Following a recent paper showing that the intrevenous needle and the metal lancets are superior to the Stallerpoint® plastic lancet, the manufacturer has improved the device to reach better standards in terms of sensitivity, intra-patient reproducibility and inter-patient reproducibility, as demonstrated on 10 adult patients, comparing the results with skin tests performed with the intravenous needle. We evaluated the sensitivity of the device by calculating the ratio between the number of true-positive tests and the sum of true-positive and false-negative tests. To assess the reproducibility of the test, we calculated the interpatient and the intrapatient coefficient of variation between the mean diameters of the papules induced by the different techniques. The improved device shows performances similar to those obtained with the intravenous needle.