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This is an indication of skin perfusion. It can be assessed by compressing a fingernail, or pressing on the sternum, for 5 seconds. The test is normal if colour returns within 2 seconds of releasing compression (i.e. a CRT of less than 2 seconds – the time taken to say the words ‘capillary refill’). If the patient is in a cold environment, CRT, especially peripherally, will be unreliable.