15 October 2020 - - Scientists have developed, for the first time, a score that can accurately predict which patients will develop a severe form of Covid-19.

The study, led by researchers at RCSI University of Medicine and Health Sciences, is published in The Lancet's translational research journal EBioMedicine.

The measurement, called the Dublin-Boston score, is designed to enable clinicians to make more informed decisions when identifying patients who may benefit from therapies, such as steroids, and admission to intensive care units.

Until this study, no Covid-19-specific prognostic scores were available to guide clinical decision-making.

The Dublin-Boston score can now accurately predict how severe the infection will be on day seven after measuring the patient's blood for the first four days.

The blood test works by measuring the levels of two molecules that send messages to the body's immune system and control inflammation.

One of these molecules, interleukin -6, is pro-inflammatory, and a different one, called IL-10, is anti-inflammatory.

The levels of both are altered in severe Covid-19 patients.

Based on the changes in the ratio of these two molecules over time, the researchers developed a point system where each 1-point increase was associated with a 5.6 times increased odds for a more severe outcome.

The Dublin-Boston score uses the ratio of IL-6 to IL-10 because it significantly outperformed measuring the change in IL-6 alone.

Despite high levels in blood, using only IL-6 measurements as a Covid-19 prognostic tool is hindered by several factors. IL-6 levels within the same patient vary over the course of any given day, and the magnitude of the IL-6 response to infection varies between different patients.

The Dublin-Boston score was developed by researchers from RCSI, Harvard University, Beaumont Hospital in Dublin and the Brigham and Women's Hospital in Boston.