The KVO rate, in health management, is an acronym for keep veins open. It is also referred to as the TKO rate, which is a acronym for to keep open.
Both the KVO and the TKO rates refer to the rate of infusion of an IV solution. The KVO and TKO rates are approximately equal to a rate from eight to 15 drops per minute.
Another term found there is CRT, or capillary refill time. It is the time for normal skin color to return after the blanching or pressing of either the skin or a nail bed.