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Plasma or Serum Planar Optical Fluorescence Assay for Carnitine (Organic Acids Profile)

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

This test measures levels of carnitine and related organic acids in your blood or urine, often used to evaluate metabolic disorders.

Quick summary

["Helps diagnose conditions affecting fat metabolism and energy production in cells."]

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

Key facts at a glance

LOINC
89240-6
Short code
OB Plan of care note
Synonyms
OB Plan of care note
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
obstetrics
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

What This Test Measures

The test detects specific organic acids, including carnitine, which play a role in transporting fatty acids into mitochondria for energy production. Abnormal levels may indicate metabolic imbalances.

Why It’s Ordered

Your healthcare provider may recommend this test if you have symptoms like muscle weakness, fatigue, or neurological issues that suggest metabolic disorders, such as carnitine deficiency or mitochondrial diseases.

Sample Collection

A blood sample (plasma or serum) is typically drawn from a vein in your arm. In some cases, a 24-hour urine collection may be required to capture organic acids over time.

Preparation

No special preparation is needed for a blood test, but follow any instructions for urine collection if applicable. Avoid certain medications that might affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated or low levels of carnitine or organic acids can signal underlying metabolic disorders, such as medium-chain acyl-CoA dehydrogenase (MCAD) deficiency or mitochondrial disorders. Early detection can guide treatment and management strategies.

Short name

Organic Acids (Carnitine) Test

Frequently asked questions

What causes abnormal results?
Abnormal results may be due to inherited metabolic disorders, certain medications, or conditions affecting fat metabolism. Always discuss findings with your healthcare provider.
How long does it take to get results?
Results are usually available within 1–3 business days, depending on lab processing times.
Can diet affect this test?
Yes, certain diets (e.g., high-fat or low-carb) may influence organic acid levels. Follow your provider’s guidance on dietary restrictions before testing.
  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