the bva-100 (blood volume analyzer) is the first instrument of its kind that can precisely measure the amount of blood a patient has in their body. blood volume measurements have been available for almost 60 years, but the test often took 4 to 8 hours to perform and was very difficult to perform accurately. due to these issues, blood volume measurements were very rarely done. physicians had been forced to rely on substitute tests that were only able to measure the thickness of the blood and can be very misleading in many surgical and medical situations. the bva-100 can measure blood volume: accurately, quickly & reliably.