BUN/Creatinine Ratio Test
BUN/Creatinine Ratio Test is a laboratory test you can order directly. The BUN/Creatinine Ratio Test compares two waste products in your blood to help assess kidney function and fluid balance. It is often ordered when kidney problems or dehydration are suspected.
- Sample type
- blood
- Category
- Kidney
- Turnaround
- 1-3 business days
- Price
- $39
- Referral
- Not required
The BUN/Creatinine Ratio Test compares two waste products in your blood to help assess kidney function and fluid balance. It is often ordered when kidney problems or dehydration are suspected.
What it measures
- BUN (Blood Urea Nitrogen) — A waste product from protein breakdown that kidneys remove.
- Creatinine — A waste product from muscle activity that kidneys filter out.
- BUN/Creatinine Ratio — A calculated number comparing BUN to creatinine levels.
Who it is for
A clinician may order this test if you have symptoms of kidney issues, dehydration, or as part of a routine metabolic panel.
Preparation
No special preparation is usually needed. Fasting is not required unless other tests are ordered at the same time.
Results and what they mean
Results are reported as numbers for BUN, creatinine, and their ratio. Your clinician interprets these in the context of your health. This is general information, not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the bun/creatinine ratio test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
What does a high BUN/Creatinine ratio mean?
It can suggest dehydration or other conditions, but only a clinician can interpret your specific results.
Do I need to fast for this test?
No, fasting is not typically required for the BUN/Creatinine Ratio Test alone.
How long until I get results?
Results are usually available within 1-3 business days.
Can I eat or drink before the test?
Yes, normal eating and drinking are fine unless your clinician gives other instructions.