![]() Intracellular, meaning the cytoplasmic fluid inside of cells. Two thirds of total body water is intracellular and 1/3 is extracellular. Now that you can estimate total body water, let's talk about how it is distributed. Because each person is different, you should use clinical judgment when deciding which formula to use based on muscle mass. ![]() That would make their total body water about 35 liters or 50% of body weight. That is approximately 60% of the total body weight.Īlternatively, these individuals who have less muscle mass weigh 70 kilograms. Using the formula we calculate that their total body water is about 54 liters. These muscular individuals have a weight of 90 kilograms. To estimate total body water for a person with low muscle mass, calculate 0.5 times the total body weight. To estimate total body water for a person with high muscle mass, calculate 0.6 times the total body weight. In order to study body fluid, we need to determine an estimate of total body water. Knowing the basics of water and solute balance in the various body fluid compartments is critical to managing patients with fluid balance disorders. There are a wide variety of solutes in our body, and each solute behaves differently when it is dissolved in our body fluid. The simplest way to think about the body is to recognize that for the most part, it is simply a whole bunch of particles dissolved into a solution of water.
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