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Galactosamine-to-Creatinine Ratio, Urine

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

A urine test that measures galactosamine relative to creatinine, helping account for urine concentration and assess urinary excretion.

Quick summary

["This test estimates urinary galactosamine excretion while adjusting for how concentrated the urine is."]

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

Key facts at a glance

LOINC
80095-3
Short code
Galactosamine/Creat Ur-sRto
Synonyms
Galactosamine/Creat Ur-sRto
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

This test measures galactosamine relative to creatinine in a urine sample. Creatinine helps account for variations in urine concentration, making the ratio useful for assessing how much galactosamine is being excreted.

Why might I need this test?

This test may be used to evaluate suspected inherited disorders of carbohydrate metabolism, particularly in people being evaluated or monitored for galactosemia. It is usually interpreted with other laboratory findings and clinical information.

How is the test performed?

A urine specimen is collected and tested for galactosamine and creatinine. The laboratory then calculates the galactosamine-to-creatinine ratio from the measurements.

How do I prepare for the test?

Follow your clinician's instructions about urine collection and timing. If a 24-hour collection is requested, be sure to collect all urine for the full period and store it as directed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine galactosamine-to-creatinine ratio

Frequently asked questions

What does the urine galactosamine-to-creatinine ratio measure?
It measures the amount of galactosamine in urine relative to creatinine. Creatinine serves as a reference for urine concentration.
Why is this test used in people with galactosemia?
It may help clinicians assess the excretion of galactosamine and monitor certain inherited disorders of carbohydrate metabolism. Results are interpreted alongside other tests and symptoms.
Does one abnormal result confirm a metabolic disorder?
No. Diet, kidney function, collection conditions, and urine concentration can affect the result, so a clinician must interpret it with your medical history and other laboratory findings.
  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