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Free Lambda-Carbohydrate (Urine) Concentration

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

This test measures the presence of a specific carbohydrate (lambda-carbohydrate) in your urine, often checked as part of metabolic or genetic screening. It helps identify conditions affecting carbohydrate metabolism or genetic disorders.

Quick summary

["This test may help detect inherited or metabolic issues linked to abnormal carbohydrate levels."]

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

Key facts at a glance

LOINC
40640-5
Short code
Lambda LC Free Ur Ql
Synonyms
Lambda LC Free Ur Ql
Category
chemistry
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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like unexplained fatigue, developmental delays, or a family history of metabolic disorders. It could also be part of prenatal screening or genetic testing for certain conditions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample, typically collected in the morning. Avoid excessive fluid intake before testing if instructed, as it may dilute results.

What the Test Results Mean

Results are qualitative (present or absent) rather than numeric, so they indicate whether lambda-carbohydrate is detected in your urine. Elevated or abnormal findings may prompt further genetic testing or evaluation of metabolic health.

Common Conditions Linked to This Test

Abnormal results could suggest genetic disorders like certain lysosomal storage diseases or metabolic syndromes affecting carbohydrate breakdown. Always discuss findings with your doctor for personalized interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Free Lambda-Carb

Frequently asked questions

What does a positive result mean?
A positive result means lambda-carbohydrate was found in your urine, which may indicate a metabolic or genetic condition. Your healthcare provider will discuss next steps, such as further genetic testing or monitoring.
Is fasting required for this test?
No fasting is required. You can drink water as usual, but avoid excessive fluid intake before testing if instructed by your provider.
How often should this test be repeated?
Frequency depends on your clinical situation. Your doctor will determine if repeat testing is needed based on symptoms, family history, or test 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