Kidney
Blood Urea Nitrogen (BUN)
Unit: mg/dLID: M018
What This Test Measures
Protein metabolism waste product; kidney function marker
Conventional vs. Functional Optimal Range
Conventional "Normal"
7-20 mg/dLYour doctor says you're "fine" anywhere in this range
Functional Optimal
10-15 mg/dLThis is where you actually feel great
The gap between these ranges is why you feel terrible with "normal" labs. Conventional medicine waits for disease. Functional medicine optimizes for health.
Gabriel's Take
BUN reflects protein breakdown and kidney filtration. Gabriel's optimal band is 10-15. Very high = kidney dysfunction or dehydration. Very low = liver issues or inadequate protein intake. Functional medicine interprets in context with creatinine.
When This Test Is High
Kidney disease, dehydration, high protein intake
When This Test Is Low
Liver disease, malnutrition, overhydration
Related Conditions
Kidney function, hydration status, protein metabolism
Recommended Follow-Up
If elevated, check creatinine, GFR; rule out dehydration