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Galactose in Serum (Mass Concentration)

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

This test measures the amount of galactose, a simple sugar, in your blood serum. It helps assess how well your body is processing galactose, which is important for proper metabolism and can indicate potential issues with galactose intolerance or liver function.

Quick summary

["Galactose levels can help diagnose metabolic disorders or liver problems related to sugar metabolism."]

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

Key facts at a glance

LOINC
53580-7
Short code
GALC Amnc-cCnt
Synonyms
GALC Amnc-cCnt
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like nausea, vomiting, diarrhea, or fatigue that could be linked to galactose intolerance, liver disease, or other metabolic conditions. It may also be part of a broader evaluation for genetic disorders affecting sugar metabolism.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw. If you’re taking medications or have a history of medical conditions, let your healthcare provider know beforehand.

How the Test Works

A small sample of blood is taken from a vein, typically in your arm. The blood is then analyzed in a lab to measure galactose concentration using a specialized method, often enzymatic or chromatographic techniques.

What the Results Mean

Results are compared to standard reference ranges, but exact values can vary by lab. Elevated levels may suggest galactose intolerance, liver dysfunction, or other metabolic disorders. Your doctor will interpret results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum Galactose Level

Frequently asked questions

What could high or low levels indicate?
High levels of galactose in the blood can signal galactose intolerance, where your body struggles to process galactose properly, leading to digestive issues or nutrient deficiencies. It may also be associated with liver problems or genetic metabolic disorders. Low levels alone are less commonly significant but could be part of a broader metabolic evaluation.
How often should I get this test?
This test is typically ordered as needed based on symptoms or medical concerns. If you have a known metabolic disorder, your doctor may recommend regular monitoring. Follow their guidance for frequency and timing of follow-up tests.
Can diet changes affect this test result?
Yes, dietary intake of galactose (found in dairy products and some vegetables) can influence results. If you suspect dietary factors are affecting your levels, discuss this with your doctor before the test to ensure accurate interpretation.
  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