An immunoassay test device for determining the presence of a ligand in a sample, said test device comprising a) a buffer solution; b) a first sorbent strip (1032; 1132; 1232a,1232b;1332; 1432a, 1432b) having a sample receiving location (1026; 1126; 1226a,1226b;1326; 1426), the strip defining a first migration path (1061; 1161; 1261a,1261b; 1361; 1461a,1461b); c) a second sorbent strip (1030; 1130; 1230a, 1230b; 1330; 1430a,1430b) distinct from said first sorbent strip, said second sorbent strip having a buffer receiving location (1024; 1124; 1224a,1224b; 1324; 1424), and the strip at least partially defining a second migration path (1062; 1162; 1262a, 1262b; 1362; 1462a,1462b) distinct from said first migration path and elongated relative to said first migration path; d) a conjugate (1039; 1139; 1239a,1239b; 1339; 1439a, 1439b) supported by said second sorbent strip; e) a test site (1033; 1333; 1233a, 1233b; 1333; 1433a,1433b) located on or in at least one of said first sorbent strip and said second sorbent strip, said test site having an immobilized ligand-binding mechanism, and said first and second sorbent strips touching each other at the test site; wherein said first migration path has a first length and said second migration path has a second length, said first length said second lengths permitting said sample to reach said test site so that ligand in said sample reaches said test site and binds to said immobilized ligand-binding mechanism prior to said conjugate reaching said test site; characterised in that the test device further comprises f) a frangible container containing said buffer solution; and g) a divider (1601, 1601 a, 1601b) at the buffer receiving location, said divider being arranged such that when the frangible container is broken, the divider will divide the buffer solution into a first amount and a second amount, directing the first amount of said buffer solution from said buffer receiving location to said first sorbent strip to move said sample to said test site, and directing the second amount of said buffer solution from said buffer receiving location to said second sorbent strip to move said conjugate to said test site. a) a buffer solution; b) a first sorbent strip (1032; 1132; 1232a,1232b;1332; 1432a, 1432b) having a sample receiving location (1026; 1126; 1226a,1226b;1326; 1426), the strip defining a first migration path (1061; 1161; 1261a,1261b; 1361; 1461a,1461b); c) a second sorbent strip (1030; 1130; 1230a, 1230b; 1330; 1430a,1430b) distinct from said first sorbent strip, said second sorbent strip having a buffer receiving location (1024; 1124; 1224a,1224b; 1324; 1424), and the strip at least partially defining a second migration path (1062; 1162; 1262a, 1262b; 1362; 1462a,1462b) distinct from said first migration path and elongated relative to said first migration path; d) a conjugate (1039; 1139; 1239a,1239b; 1339; 1439a, 1439b) supported by said second sorbent strip; e) a test site (1033; 1333; 1233a, 1233b; 1333; 1433a,1433b) located on or in at least one of said first sorbent strip and said second sorbent strip, said test site having an immobilized ligand-binding mechanism, and said first and second sorbent strips touching each other at the test site; wherein said first migration path has a first length and said second migration path has a second length, said first length said second lengths permitting said sample to reach said test site so that ligand in said sample reaches said test site and binds to said immobilized ligand-binding mechanism prior to said conjugate reaching said test site; f) a frangible container containing said buffer solution; and g) a divider (1601, 1601 a, 1601b) at the buffer receiving location, said divider being arranged such that when the frangible container is broken, the divider will divide the buffer solution into a first amount and a second amount, directing the first amount of said buffer solution from said buffer receiving location to said first sorbent strip to move said sample to said test site, and directing the second amount of said buffer solution from said buffer receiving location to said second sorbent strip to move said conjugate to said test site.