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Fatty Acid Binding Protein (FABP) in Urine

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

This test measures a protein found in urine that helps transport fatty acids. It may be checked to assess kidney function or detect kidney-related conditions.

Quick summary

["FABP in urine can signal kidney issues or metabolic health concerns."]

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

Key facts at a glance

LOINC
25158-7
Short code
Oval fat bodies UrnS Ql Micro
Synonyms
Oval fat bodies UrnS Ql Micro
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
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 Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like kidney problems (e.g., swelling, fatigue), unexplained protein in urine, or conditions affecting fat metabolism. It can also help monitor kidney function in certain chronic diseases.

What Does the Test Involve?

You’ll provide a urine sample (typically a midstream clean-catch or catheterized sample) to test for FABP levels. The sample is sent to a lab for analysis using a specialized immunoassay method.

What Do Results Mean?

Higher-than-normal levels may indicate kidney disease, metabolic disorders, or other conditions affecting fat transport. Lower-than-normal levels might suggest certain genetic or metabolic conditions. Results are interpreted by your provider based on your medical history.

What Are Common Causes of Abnormal Results?

Elevated FABP in urine can result from kidney damage, diabetes, heart failure, or certain metabolic syndromes. Low levels may be linked to genetic disorders or deficiencies in fat metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Fatty Acid Binding Protein

Frequently asked questions

What does a positive or abnormal result mean for my health?
An abnormal result doesn’t diagnose a specific condition alone. Your provider will review your symptoms, medical history, and other test results to determine next steps, such as further kidney function tests or specialist evaluation.
How often should I get this test?
Frequency depends on your health status and provider’s recommendations. If you have chronic kidney disease, diabetes, or another condition linked to FABP, your provider may schedule follow-up tests as needed.
Can lifestyle changes affect FABP levels?
Dietary habits (e.g., high-fat intake) or physical activity may indirectly influence kidney health, which could affect FABP levels. Always follow your provider’s advice for managing any underlying conditions.
  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