What usually happens next
A diet low in protein, drinking a lot and pregnancy are the usual reasons; on its own it rarely means anything.
What a low BUN usually means, and its common causes
When a BUN can read wrong
BUN rises with dehydration, a big protein intake, steroids and bleeding in the gut, none of which mean the kidneys are failing. Creatinine and eGFR are the better kidney measures.
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Nearby results
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Questions
Is a BUN of 5 mg/dL normal?
A BUN of 5 mg/dL is under the usual 7 to 20 mg/dL. The usual range is about 7 to 20 mg/dL (some labs 6 to 24).
What is 5 mg/dL in mmol/L urea?
1.8 mmol/L urea. Labs in different countries print BUN in different units; the meaning is the same.
Worked out by LifeFrom from the usual lab range (Clinical Methods), and not yet reviewed by a clinician. For your own understanding: only a lab test, read by your clinician, diagnoses anything.