Skip to content

Microscopic examination of urine sediment (urine microscopic urinalysis)

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

This test checks for cells, crystals, bacteria, or other substances in your urine under a microscope. It helps identify infections, kidney issues, or other health problems.

Quick summary

["A microscopic urine test can reveal hidden problems like infections or kidney damage."]

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

Key facts at a glance

LOINC
27045-4
Short code
Microscopic Ur-Imp
Synonyms
Microscopic Ur-Imp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
cytology
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 It’s Done

Your doctor may order this test to diagnose or monitor conditions such as urinary tract infections, kidney stones, kidney disease, or other urinary issues. It’s also used to check for blood in urine, protein loss, or signs of inflammation.

What to Expect

You’ll provide a urine sample, usually collected in the morning. The sample is then examined under a microscope to look for abnormal cells, crystals, or microorganisms.

Common Findings

Common findings include white blood cells (indicating infection), red blood cells (suggesting bleeding or kidney issues), bacteria (sign of infection), or crystals (possible kidney stones). Other substances like casts or protein may also be seen.

When Results Matter

Abnormal results may signal urinary tract infections, kidney problems, bladder stones, or other conditions that require further medical evaluation or treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine microscopic exam

Frequently asked questions

What does a positive microscopic urine test mean?
A positive result means your urine contains abnormal substances like cells, bacteria, or crystals. This could indicate an infection, kidney issue, or other health concerns that your doctor will discuss with you.
How often should I get this test?
Your doctor will determine how often you need this test based on your health history, symptoms, and any ongoing conditions. Regular tests may be recommended for people with kidney disease, diabetes, or recurrent urinary tract infections.
Can I prepare for this test?
No special preparation is needed. Avoid using strong perfumed soaps or feminine products in the area before collecting your urine sample to ensure accurate 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