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Volume of Bladder by Empirical Measurement (24-hour Collection)

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

This test measures the total volume of urine collected over a 24-hour period from your bladder. It helps assess how well your bladder empties and if fluid retention or urinary issues are present.

Quick summary

["Understanding your bladder’s fluid handling can help diagnose or monitor conditions like urinary retention or kidney function."]

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

Key facts at a glance

LOINC
15321-3
Short code
Volume Bladder by EMP
Synonyms
Volume Bladder by EMP
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-derived-emp
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 This Test Is Done

Doctors may order this test if you experience symptoms like frequent urination, incomplete bladder emptying, or if you have a history of urinary retention. It’s also used in research or specialized clinical settings where precise bladder volume assessment is needed.

How the Test Works

You’ll collect all urine produced in a 24-hour period in a container provided by your healthcare team. The collected urine is then measured to determine the total volume.

What to Expect Before the Test

No special preparation is needed beyond following standard urine collection guidelines. Drink fluids as usual unless instructed otherwise, but avoid diuretics or medications that affect urine output.

What to Expect During the Test

You’ll receive clear instructions on how to collect urine over 24 hours. Typically, you’ll start the collection at a specific time (often midnight) and continue until the same time the next day. The collected urine is sealed and returned to the lab for analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Bladder Volume

Frequently asked questions

How long does it take to get results?
Results are typically processed within 1–3 business days, depending on lab workload. Your healthcare provider will contact you once results are ready.
What does a low or high bladder volume mean?
A low bladder volume may indicate issues like dehydration, urinary retention, or medications that reduce urine output. A high volume could suggest overhydration, excessive fluid intake, or conditions like diabetes insipidus. Your doctor will interpret results in the context of your symptoms and medical history.
Can I drink alcohol or caffeine before the test?
Alcohol and caffeine can increase urine output, which may affect your results. Avoid them for 24 hours before the test unless instructed otherwise by your doctor.
  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