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Urinalysis with Microscopic Examination of Kidney Red Blood Cells (RBCs)

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

This test examines your urine under a microscope to check for tiny red blood cells (RBCs) that may come from your kidneys. These cells can signal kidney damage or other health issues.

Quick summary

["Microscopic urine RBCs help identify kidney-related problems early."]

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

Key facts at a glance

LOINC
100884-6
Short code
MR Guided Kidney-R Bx
Synonyms
MR Guided Kidney-R Bx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like blood in your urine, pain in your back or side, or if you’re at higher risk for kidney problems. It’s also used to monitor kidney function in certain conditions.

What to Expect During the Test

You’ll provide a urine sample, typically a midstream clean-catch or catheterized sample. The sample is then examined under a microscope to count and identify RBCs.

What the Results Mean

Abnormal findings (e.g., many RBCs) may indicate kidney stones, infections, trauma, or other kidney issues. Normal results suggest no visible RBCs in the urine.

Common Causes of Abnormal Findings

High RBC counts can result from kidney diseases, urinary tract infections, or conditions like glomerulonephritis. Always discuss results with your provider for personalized interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Kidney RBCs in Urine (Microscopic)

Frequently asked questions

Will I feel any pain during the urine collection?
Most people don’t feel pain during a simple urine sample, but you may experience mild discomfort if using a catheter. Clean-catch samples are usually painless.
How soon will I get my results?
Results are typically available within 1–2 business days, depending on lab processing times.
Can I drink water before this test?
Yes, you can drink water as usual unless your provider specifies otherwise, as hydration helps with urine flow.
  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