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Volume of bladder urine (24-hour collection)

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

This test measures the total volume of urine collected from your bladder over a 24-hour period. It helps assess how well your kidneys are filtering fluids and managing fluid balance in your body.

Quick summary

["Understanding your fluid intake and output helps doctors check kidney function and overall hydration status."]

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

Key facts at a glance

LOINC
15309-8
Short code
Volume Bladder from HWL
Synonyms
Volume Bladder from HWL
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-hwl
CPT
86430
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

Your healthcare provider may order this test if you have symptoms like frequent urination, dehydration, kidney issues, or if they suspect an imbalance in fluids. It can also be used to monitor conditions like diabetes, heart failure, or kidney disease.

How the Test Is Performed

You’ll collect all urine for 24 hours, typically starting after midnight and ending the same time the next day. A healthcare provider will give you a clean container to store the urine. The total volume is measured at the end of the collection period.

What to Expect Before the Test

No special preparation is needed, but you should drink enough fluids to maintain normal urine output. Avoid using diuretics or medications that affect urine production without consulting your doctor.

What to Expect During the Test

You’ll collect urine in a container at home, then return it to your doctor’s office or lab for measurement. The test is painless and doesn’t require any special equipment at home.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Urine Bladder Volume

Frequently asked questions

How long does the urine collection last?
The urine collection period is typically 24 hours, starting after midnight and ending at the same time the next day. You’ll need to collect every drop of urine during this time.
Can I drink alcohol during the urine collection?
Alcohol may affect fluid balance and urine output. It’s best to avoid it during the collection period unless advised otherwise by your doctor.
Will I need to take any special medications before the test?
Some medications can alter urine volume. Always inform your doctor about all medications, including over-the-counter drugs, before starting the collection.
  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