IL-2 GoStix Plus employ a lateral flow-based detection method and accompanying smartphone application to enable rapid quantification of human IL-2 from cell culture supernatant or serum samples in only 10 minutes. Simply apply 20 µl of sample and 80 µl of chase buffer to a GoStix cassette, wait 10 minutes for test and control bands on the cassette to develop, and then scan the cassette using a mobile device running the GoStix Plus app to quantify the amount of IL-2 present in the sample. The dynamic range and reproducibility of IL-2 GoStix Plus are comparable to the performance of an ELISA, such that users can expect to obtain similar results in a fraction of the time.