A device for carrying out a lateral flow assay on a sample comprising: (a) a sample containing unit comprising a sample container, said sample container being closed off at one end by a bottom wall, said bottom wall having a hole sealed by a plug; and (b) a housing located under said sample container and capable of holding a test strip, said sample containing unit and said housing being coupled so as to allow rotation one relative to the other, said housing comprising a cutting arrangement capable of cutting said plug; wherein rotation of said sample containing unit and said housing one relative to the other results in said cutting arrangement cutting said plug, thereby unplugging the hole in said bottom wall. Also disclosed is a method for determining the presence or absence of an analyte in a sample, using the device.