Published on 27 Jul 2020

NTU Singapore researchers speed up gold-standard COVID-19 diagnostic test

Portable test produces results in 36 minutes; works for dengue and other viruses as well

NTU Singapore Lee Kong Chian School of Medicine (LKCMedicine) have demonstrated a way to improve the speed, handling time and cost of COVID-19 laboratory tests. The improved testing method yields results in 36 minutes – a quarter of the time required by existing gold-standard tests.

Their new approach could enable the wider adoption of COVID-19 testing for diagnosis in academic or research laboratories, and allow for screening and research especially in countries and regions with limited laboratory capabilities.

The test, which can be done with portable equipment, could also be deployed in the community as a screening tool.

Currently, the most sensitive method for testing for COVID-19 is through a laboratory technique called polymerase chain reaction (PCR), in which a machine amplifies viral genetic material by copying it over and over again so any trace of the SARS-CoV-2 virus can be detected.

A big bottleneck in sample testing is RNA purification – separating RNA from other components in the patient sample – a laborious process that requires chemicals that are now in short supply worldwide. Its steps have to be performed by highly trained technical staff and can take a few hours. Currently, automated equipment for sample preparation costs hundreds of thousands of dollars, and requires specialised laboratory facilities.

The method developed by NTU LKCMedicine combines many of these steps and allows direct testing on the crude patient sample, cutting down the turnaround time from sample-to-result, and removing the need for RNA purification chemicals.

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