A capillary refill time of three seconds or more should be considered abnormal. 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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