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What (who) is capillary circulation - definition
![[[Scanning electron micrograph]] of a [[liver sinusoid]] with fenestrated endothelial cells. Fenestrae are approximately 100 nm in diameter.](https://commons.wikimedia.org/wiki/Special:FilePath/Sinusoid.jpeg?width=200 "[[Scanning electron micrograph]] of a [[liver sinusoid]] with fenestrated endothelial cells. Fenestrae are approximately 100 nm in diameter.")
Wikipedia
Capillary refill time (CRT) is defined as the time taken for color to return to an external capillary bed after pressure is applied to cause blanching. It can be measured by holding a hand higher than heart-level and pressing the soft pad of a finger or fingernail until it turns white, then taking note of the time needed for the color to return once pressure is released. In humans, CRT of more than three seconds indicates decreased peripheral perfusion and may indicate cardiovascular or respiratory dysfunction. The most reliable and applicable site for CRT testing is the finger pulp (not at the fingernail), and the cut-off value for the normal CRT should be 3 seconds, not 2 seconds.
