London: A new small-boxed Covid-19 rapid test device, which gives results within 90 minutes, has been found to have a high level of accuracy and produced very few false negatives and no false positives in a UK study.The Lab-in-Cartridge tests can be performed in cartridges smaller than a mobile phone and do not require a laboratory.The study, led by Imperial College London scientists and published in ‘The Lancet Microbe’ this week, involved high-speed tests on 386 National Health Service (NHS) staff and patients and were found to have over 94 per cent sensitivity and 100 per cent specificity.“These results suggest the test, which can be performed at a patient’s bedside without the need to handle any sample material, has comparable accuracy.