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Galactose in Serum or Plasma (Mass Concentration)

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

This test measures the amount of galactose, a simple sugar, in your blood. It may be used to help diagnose or monitor conditions affecting sugar metabolism.

Quick summary

["Galactose levels can help identify metabolic disorders or track blood sugar balance."]

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

Key facts at a glance

LOINC
24095-2
Short code
GALNS Fib-cCnt
Synonyms
GALNS Fib-cCnt
Category
chemistry
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of galactosemia (a rare genetic disorder causing galactose buildup) or if you have other conditions like liver disease, diabetes, or kidney problems that could affect sugar metabolism. It may also be part of routine screening in certain high-risk groups.

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 your test involves fasting. Wear comfortable clothing and plan to rest for a short time afterward.

How the Test Is Performed

A healthcare professional will collect a blood sample from a vein in your arm using a needle. You may feel a small pinch, but the procedure is quick and typically painless. The blood sample will be sent to a lab for analysis.

What the Results Mean

Results are compared to standard reference ranges, though exact values can vary by lab. Elevated levels may indicate metabolic issues, while very low levels could suggest certain genetic disorders or malabsorption problems. Your provider will discuss these findings with you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Galactose Level

Frequently asked questions

What does elevated or low galactose mean?
High galactose levels can signal galactosemia or other metabolic disorders that require medical management, such as dietary restrictions or enzyme therapy. Low levels may be normal but could also hint at conditions like severe liver disease or malabsorption syndromes if persistent.
How often should I get this test?
The frequency depends on your health condition. For diagnosed metabolic disorders, tests may be scheduled regularly to monitor progression or treatment effectiveness. Follow your healthcare provider’s advice for follow-up testing.
Can I eat or drink before the test?
Typically, fasting is not required unless specified by your provider. However, always confirm with them before the appointment to avoid any delays or inaccuracies in results.
  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