Quick Reference
- Full form
- Blood Urea Nitrogen
- Sample type
- Blood
- Fasting
- Not required
- Marker measured
- 1
- Report turnaround
- Same day
- Available at
- All locations
About BUN (Blood Urea Nitrogen)
BUN measures urea nitrogen, a waste product your kidneys filter out, and is one of the classic markers used alongside creatinine to assess kidney function. It can also be affected by hydration, diet, and certain medications.
No fasting is required, and results are available the same day.
How to Prepare
- No fasting required.
- No special preparation needed before your blood draw.
Frequently Asked Questions
What does a BUN test measure?
It measures urea nitrogen, a waste product filtered by your kidneys, and is used alongside creatinine to assess kidney function.
Do I need to fast before this test?
No fasting is required.
What can cause a high BUN besides kidney issues?
Dehydration, a high protein diet, and certain medications can all raise BUN levels temporarily.
Is BUN tested alone or with other kidney markers?
It is typically tested together with creatinine as part of a kidney function panel.
How soon will my report be ready?
Same day.
Is home sample collection available?
Yes, in all City Care Lab service areas.
This page provides general health information and is not a substitute for medical advice. Speak with your doctor about your specific results and treatment.