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Serum Creatinine and Blood Urea Nitrogen (BUN) Profile with Electrolyte Screening

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

This test measures key markers for kidney function (creatinine and BUN) and electrolytes (sodium, potassium, chloride) to assess hydration, kidney health, and fluid balance.

Quick summary

["Check kidney function and electrolyte balance with this simple blood test."]

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

Key facts at a glance

LOINC
7144-9
Short code
Liver Beef BasoBnd Ab Qn
Synonyms
Liver Beef BasoBnd Ab Qn
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
lhr
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

Creatinine: A waste product from muscle metabolism filtered by the kidneys. Elevated levels may indicate reduced kidney function. Blood Urea Nitrogen (BUN): Another waste product from protein metabolism, often measured alongside creatinine. Electrolytes (sodium, potassium, chloride): Critical for nerve and muscle function, heart rhythm, and fluid balance.

Why It Matters in Your Health

Kidneys play a vital role in filtering waste and maintaining electrolyte balance. This test helps doctors monitor kidney function, detect dehydration, or identify imbalances that could affect your heart, muscles, or overall health.

Common Reasons for This Test

Doctors may order this test if you have symptoms like fatigue, swelling, frequent urination, or confusion. It’s also used before surgeries, during pregnancy, or if you have conditions like high blood pressure, diabetes, or kidney disease.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if creatinine or BUN levels are being closely monitored. Drink plenty of water the day before if you’re dehydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Liver and Kidney Function + Electrolytes

Frequently asked questions

Why might my creatinine or BUN levels be higher than usual?
Higher creatinine or BUN levels can signal kidney problems, dehydration, or heart failure. If your doctor finds abnormal results, they may investigate further with more tests or adjustments to your medications.
What if my electrolytes are out of balance?
Low sodium or potassium levels can cause weakness, irregular heartbeat, or muscle cramps. High levels may lead to confusion, nausea, or heart rhythm issues. Your doctor will work with you to correct imbalances through diet, medications, or fluid adjustments.
Can diet or medications affect these test results?
Yes—high-protein foods, certain medications (like NSAIDs or diuretics), or dehydration can raise BUN or creatinine. If you’re on medications or have dietary restrictions, let your doctor know to avoid false results.
  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