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Galactose in Blood (Mass Concentration)

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

This test measures the amount of galactose, a simple sugar found in your blood. It may be ordered to check for galactosemia or other metabolic conditions.

Quick summary

["Galactose levels help diagnose inherited sugar metabolism disorders."]

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

Key facts at a glance

LOINC
1481-1
Short code
Galactose 2h p 400 g Gal PO Bld-mCnc
Synonyms
Galactose 2h p 400 g Gal PO Bld-mCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
44
Ref high
147
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84075
SNOMED
27550007
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like vomiting, diarrhea, or developmental delays in infants, or if you have a family history of galactosemia—a rare genetic disorder affecting sugar metabolism. Adults might also be tested if they have unexplained liver issues or if they’ve had a history of galactose intolerance.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re a child or have trouble sitting still, your provider may use a different vein or a special needle designed for infants.

What the Test Results Mean

Results are compared to a general reference range for healthy adults and children. Very high or very low levels may indicate metabolic disorders, liver problems, or other health conditions. Your provider will discuss the results with you in the context of your overall health.

Common Conditions Linked to Abnormal Results

High galactose levels may suggest galactosemia, a genetic disorder where the body can’t properly process galactose. Very low levels might indicate other metabolic issues or liver dysfunction. Always consult your healthcare provider for interpretation.

Reference range

Adult: 44-147 U/LN/A

Specimen: whole-blood

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Galactose Level

Frequently asked questions

What causes high or low galactose levels in blood?
High levels are most commonly linked to galactosemia or other inherited metabolic disorders. Rarely, high levels can result from liver disease, kidney problems, or certain medications. Low levels may occur in people with severe liver disease or those who have had significant blood loss.
Can diet or lifestyle changes affect galactose levels?
Yes, dietary factors can influence galactose levels. People with galactosemia must avoid galactose and lactose (found in dairy). In general, a balanced diet supports normal blood sugar metabolism, but specific dietary restrictions should be discussed with your doctor.
How often should this test be repeated?
The frequency depends on your symptoms and diagnosis. If you have galactosemia, your provider may recommend regular monitoring. Otherwise, this test is usually done as part of a diagnostic evaluation and not routinely unless symptoms arise.
  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