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Glucose in Serum (24-Hour Urine Collection)

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

This test measures the amount of glucose (sugar) found in your urine over a 24-hour period.

Quick summary

["Assessing how much sugar appears in your urine can help detect or monitor conditions like diabetes."]

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

Key facts at a glance

LOINC
79202-8
Short code
GH 45M p Arg+Ins SerPl-mCnc
Synonyms
GH 45M p Arg+Ins SerPl-mCnc
Category
hormone
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 or prediabetes, or if you have symptoms like frequent urination, excessive thirst, or unexplained weight loss. It can also help check if your blood sugar is well-controlled over time.

What to Expect Before the Test

You’ll need to collect all urine for a full 24-hour period, typically starting after midnight one day and ending the same time the next day. Drink plenty of water but avoid sugary drinks or medications that may affect results.

How the Test Is Performed

Urine samples are collected in a container and sent to the lab. The lab analyzes the urine for glucose content using a specialized method, often an immunoassay or enzymatic technique.

What the Results Mean

Higher-than-normal glucose in urine may indicate poor blood sugar control, kidney issues, or other metabolic conditions. Your doctor will interpret results in relation to your overall health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Glucose in urine (glycosuria) is typically a late sign of uncontrolled diabetes, where blood sugar levels remain too high. It can also signal kidney problems or other conditions affecting sugar metabolism. Regular monitoring helps prevent complications like nerve damage, kidney disease, or cardiovascular issues.

Frequently asked questions

What causes glucose to appear in urine?
Glucose can appear in urine when your kidneys are unable to reabsorb it properly, often due to high blood sugar levels (e.g., diabetes). Other factors, like certain medications, kidney disease, or pregnancy, may also play a role.
How is this test different from a blood glucose test?
This test measures glucose in urine over 24 hours, while a blood glucose test checks current blood sugar levels. Urine tests are less sensitive and typically used to assess long-term sugar control or rule out conditions like diabetes.
Can diet or exercise affect urine glucose results?
Dietary changes or exercise can temporarily influence blood sugar levels, which may indirectly affect urine glucose. However, since this test measures a full 24-hour collection, short-term fluctuations are less likely to skew results significantly.
  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