We have evaluated a new blood glucose test-strip (Visidex II, Ames), which does not require washing with water after contact with blood. Visidex II showed a significant negative bias when compared with a similar diagnostic strip (BM 20-800, Boehringer) and with the Beckman II glucose analyser (p less than 0.001 in both cases), and a poorer correlation with either method than BM strips with the Beckman II. A significant number (6.3%) of Visidex strips in this study were unreadable due to removal of the colour pads on blotting, and some difficulty was reported by patients in reading values around 6-8 mmol/l. Visidex II can safely be stored in the refrigerator and developed strips may be stable longer than BM strips. A significant error in reading was noted if the incubation time was varied by +/- 5 seconds. Further experience and perhaps some modifications may be necessary before Visidex II can be recommended for widespread use.