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Erythrocyte Blood Urea Nitrogen (EBUN) Study

Published: August 9, 2026Updated: August 16, 2026

This test measures the relationship between your red blood cells and blood urea nitrogen (BUN), which helps assess kidney function and fluid balance.

Quick summary

["This test helps doctors evaluate how well your kidneys are filtering waste from your blood."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
100231-0
Short code
EBUS study
Synonyms
EBUS study
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The EBUN study combines BUN (a waste product from protein breakdown) with red blood cell counts to provide a broader view of your blood chemistry. While BUN alone indicates kidney function, this test may offer additional insights into conditions affecting red blood cells or fluid balance.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fatigue, swelling, or signs of kidney issues (e.g., high blood pressure, fluid retention). It’s also used in monitoring chronic conditions like heart failure or kidney disease.

What to Expect

A simple blood draw is typically needed. The test may be done as part of a routine checkup or after a doctor suspects an underlying issue. Results are usually ready within 24–48 hours.

Common Conditions Monitored

This test can help diagnose or track conditions like chronic kidney disease, heart failure, dehydration, or anemia. It may also be used in patients with liver disease or those on certain medications that affect kidney function.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

None

Frequently asked questions

What does an EBUN study involve?
It involves a blood test that measures both BUN levels and red blood cell counts. The results are analyzed together to assess kidney function and fluid balance, often in relation to your symptoms or medical history.
How long does it take to get results?
Most EBUN studies are processed within 24–48 hours, depending on lab capacity. Your doctor will contact you once results are available.
Can I eat or drink before this test?
Typically, no special preparation is needed unless your doctor specifies otherwise. For general blood tests, fasting may not be required, but always follow your provider’s instructions.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy