Skip to content

Glucose in Serum (24-hour urine collection)

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

This test measures how much glucose (sugar) appears in your urine over a full day. It helps check for conditions like diabetes or kidney issues that may cause excessive sugar in urine.

Quick summary

["Assesses long-term sugar excretion, often linked to diabetes management or kidney function."]

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

Key facts at a glance

LOINC
95656-5
Short code
GA<30w
Synonyms
GA<30w
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 doctor may order this test if they suspect you have diabetes, kidney problems, or other metabolic conditions that affect how your body processes glucose. It can also help monitor how well your current treatments are working.

What to Expect Before the Test

You’ll need to collect all urine for a full 24-hour period, typically starting after midnight and ending the next midnight. Drink plenty of water to help flush out glucose, but avoid sugary drinks or foods that day. Follow your doctor’s instructions precisely to ensure accurate results.

How the Test Works

Your urine sample is collected and analyzed for glucose levels. The test measures how much glucose is excreted in urine over time, which can indicate how efficiently your body is managing blood sugar.

What the Results Mean

Higher-than-normal glucose in urine may signal diabetes, kidney problems, or other metabolic disorders. Your doctor will interpret results in the context of your overall health and other tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-hour urine glucose

Frequently asked questions

What causes elevated urine glucose levels?
Elevated urine glucose can result from diabetes (both type 1 and type 2), kidney problems, or certain medications. Stress, illness, or hormonal changes may also temporarily affect results.
How often should I get this test?
Your doctor will determine the frequency based on your health needs. For diabetes management, it may be done less often than routine blood sugar checks, but follow their guidance for personalized care.
Can I eat or drink anything before this test?
Yes, but avoid sugary foods/drinks during the 24-hour collection period. Stick to water and follow your doctor’s specific instructions to avoid interfering with 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