What percentage of total blood volume is comprised of plasma?

Plasma makes up a significant portion of the total blood volume, and in humans, it typically accounts for about 55%. Plasma is the liquid component of blood, in which various substances such as nutrients, hormones, waste products, and proteins are dissolved. This percentage is crucial for understanding blood composition and functions, such as transporting nutrients and waste and maintaining blood pressure and volume.

Knowing that plasma composes around 55% helps laboratory animal technicians understand various physiological and medical conditions that can affect blood components, including dehydration or volume overload. Understanding the proportion of plasma relative to the entire blood volume is vital for interpreting lab results, administering treatments, and performing blood draws accurately.