Extracellular fluid volume calculator and method for calculating extracellular fluid volume

A method for calculating an extracellular fluid volume, the method comprising:

• acquiring a pre-hemodialysis plasma uric acid concentration;
• acquiring a post-hemodialysis plasma uric acid concentration;
• acquiring a removal amount of uric acid by hemodialysis and a removal volume of water during hemodialysis;
• and
• calculating a post-hemodialysis extracellular fluid volume based on a difference between a pre-hemodialysis amount of uric acid and a post-hemodialysis amount of uric acid, the difference being determined based on the pre-hemodialysis plasma uric acid concentration, the post-hemodialysis plasma uric acid concentration, the removal amount of uric acid, and the removal volume of water.

An extracellular fluid volume calculator comprising:

• a processor;
• and
• a memory storing computer-readable instructions therein,
• wherein the computer-readable instructions, when executed by the processor, cause the extracellular fluid volume calculator to execute;
• acquiring a pre-hemodialysis substance concentration, a post-hemodialysis substance concentration, a removal amount of a substance by hemodialysis, and a removal volume of water during hemodialysis, wherein the pre-hemodialysis substance concentration is a pre-hemodialysis concentration of the substance in plasma, the post-hemodialysis substance concentration is a post-hemodialysis concentration of the substance in plasma, and the substance is incapable of passing through a cell membrane and is capable of passing through a capillary membrane;
• and
• calculating an extracellular fluid volume based on a difference between a pre-hemodialysis amount of the substance and a post-hemodialysis amount of the substance, the difference being determined based on the pre-hemodialysis substance concentration, the post-hemodialysis substance concentration, the removal amount of substance, and the removal volume of water.