Original sentence: Based on Lundsgaard and Van Slyke's work, it is classically described as occurring if 5.0 g/dL of deoxyhemoglobin or greater is present.It is derived from the color cyan, which comes from kyanós, the Greek word for "blue".Since estimation of hypoxia is usually now based either on arterial blood gas measurement or pulse oximetry, this is probably an overestimate, with evidence that levels of 2.0 g/dL of deoxyhemoglobin may reliably produce cyanosis.The name cyanosis literally means "the blue disease" or "the blue condition".This was based on an "estimate" of capillary saturation based on a mean of arterial versus peripheral venous blood gas measurements
Edited sentence: "  It is derived from the color cyan, which comes from kyanos, the Greek word for blue.2(1): is classically described as occurring if 5.0 g/dL of deoxyhemoglobin or greater is present.Based on Lundsgaard and Van Slyke's work, Lundsgaard C, Van Slyke DD.Since estimation of hypoxia is usually now based either on arterial blood gas measurement, or pulse oximetry, this is probably an overestimate, with evidence that levels of 2.0 g/dL of deoxyhemoglobin may reliably produce cyanosis.The name cyanosis, literally means "the blue disease" or "the blue condition.What is commonly forgotten, however, is that this was based on an "estimate" of capillary saturation based on a mean of arterial versus peripheral venous blood gas measurements