Tag: Bun

Over 50 years ago, clinicians primarily used the Nonprotein Nitrogen (NPN) level to evaluate a patient's kidney function, but this approach has since been superseded by more specific and accurate blood tests. In modern medical terms, **what does NPN mean** and why is it no longer the standard for diagnosis?

Over 85% of urea is normally filtered out of the blood by the kidneys, but when that process is disrupted, levels can rise. This raises the question, **Why would urea be high in blood?** The answer involves several potential factors, from lifestyle habits to serious health conditions.

Blood is roughly 55% plasma, which is nearly 92% water, so a fluid imbalance has immediate and significant effects. Understanding **what does dehydration do to blood levels** is crucial, as it can skew diagnostic tests and impact overall health in profound ways.