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Galactose in Urine (Qualitative, 24-Hour Collection)

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

This test checks for the presence of galactose, a sugar, in your urine over a 24-hour period. It helps identify conditions where your body may not properly process galactose.

Quick summary

["A 24-hour urine test for galactose can help detect galactosemia or other metabolic issues."]

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

Key facts at a glance

LOINC
23249-6
Short code
M agalactiae Ab Ser Ql CF
Synonyms
M agalactiae Ab Ser Ql CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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 vomiting, poor weight gain, or jaundice in infants, or if you have a family history of galactose intolerance. It’s also used in newborn screening programs to detect metabolic disorders early.

What to Expect Before the Test

You’ll need to collect all urine for a full 24-hour period, typically starting after midnight the night before the test and ending the next morning. Drink plenty of fluids to help your urine flow freely. Follow your provider’s instructions carefully to ensure accurate results.

How the Test Is Performed

A urine sample is collected and tested for galactose using a qualitative method, often involving chemical reactions that produce visible changes (e.g., color shifts). The test does not require blood or other bodily fluids.

What the Results Mean

Positive results (detecting galactose in urine) suggest a metabolic disorder, such as galactosemia, where the body cannot properly break down galactose. Negative results mean no abnormal sugar was found in your urine.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Galactose in Urine (24h)

Frequently asked questions

What does a positive result mean?
A positive result indicates the presence of galactose in your urine, which may signal an underlying metabolic condition like galactosemia. This condition requires medical management, often involving dietary changes or enzyme therapy to prevent long-term health issues.
What does a negative result mean?
A negative result means galactose was not detected in your urine sample, suggesting no immediate metabolic issues related to galactose processing. However, further testing or monitoring may still be needed if symptoms persist or if there’s a family history of galactose disorders.
How often should I get this test?
This test is typically done once as part of newborn screening or diagnostic evaluation. If you have a confirmed metabolic disorder, your healthcare provider may recommend periodic monitoring or additional tests as needed.
  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