Press on the finger for five seconds using moderate pressure at an ambient temperature of 20–25 degrees Celsius. This research follows a previous systematic review by the same authors, published in Archives of Diseases in Childhood in 2015, that recommends a standardised CRT method of measurement be adopted internationally: Published in PLOS One, the review led by Dr Susannah Fleming, a research fellow in the University of Oxford’s Nuffield Department of Primary Care Health Sciences, is the first comprehensive and systematic assessment of the diagnostic value of the CRT test for a range of serous outcomes in children worldwide. Normal capillary refill time is usually 2 seconds or less. It is a simple test to measure the time taken for colour to return to an external capillary bed after pressure is applied, typically by pressing the end of a finger with the thumb and forefinger. Dr Susannah Fleming, Nuffield Department of Primary Care Health Sciences, University of Oxford.Ī capillary refill time (CRT) of 3 seconds or more is an important warning sign for serious illness and risk of death in children, a systematic review of 24 studies on over 53,000 children has concluded.ĬRT is widely recommended as part of the routine assessment of unwell children. Considering this is a diagnostic tool that doesn’t require any sophisticated equipment and can be measured easily in children of all ages, our findings add a great deal of evidence to the argument for incorporating CRT into the standard evaluation of all acutely ill children worldwide.
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