Overview: Arachidonic Acid TestIntroduction: The Arachidonic Acid Test measures levels of a fatty acid to assess metabolic or inflammatory conditions, which may contribute to heart disease or inflammation, helping guide treatment. Affecting individuals with chronic inflammatory disorders, this test is key for metabolic health. Following 2023 American Society for Nutrition (ASN) guidelines, it uses LC-MS/MS for high accuracy, supporting biochemistry screening. This test is essential for diagnosis, risk stratification, and improving outcomes in cardiology and immunology.
Other Names: AA Level Test, Arachidonic Acid Assay.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic reliability.
Historical Milestone: Fatty acid testing began in the 1980s with research by Holman, who linked arachidonic acid to inflammation. LC-MS/MS advancements in the 2000s by companies like Agilent improved detection, surpassing earlier gas chromatography methods.
Purpose: Measures arachidonic acid levels to assess inflammation or cardiovascular risk, guides dietary therapy or anti-inflammatory drugs, and evaluates patients with heart disease or inflammation, aiming to prevent complications.
Test Parameters: Arachidonic acid levels
Pretest Condition: Fasting preferred to reflect baseline levels. Collect plasma or serum. Report history of inflammation or heart disease.
Specimen: Plasma (NaHep, 2-4 mL), Serum (SST, 2-5 mL); 2 mL plasma in Na Heparin tube. Transport in a biohazard container.
Sample Stability at Room Temperature: 4 hours
Sample Stability at Refrigeration: 48 hours
Sample Stability at Frozen: 1 month
Medical History: Document inflammation or heart disease risk. Include current medications, diet, or family history.
Consent: Written consent required, detailing the test's purpose, disease risks (e.g., heart attack), and sample collection risks.
Procedural Considerations: Uses LC-MS/MS to measure arachidonic acid, requiring labs with mass spectrometers and trained technicians. Results available in 2-3 days. Performed in labs with strict handling.
Factors Affecting Result Accuracy: Hemolysis or non-fasting status can skew results. Medications may alter levels, requiring correlation.
Clinical Significance: Elevated levels indicate inflammation risk, guiding therapy. Early intervention might prevent heart disease, while untreated cases lead to complications. Normal levels may require additional lipid tests.
Specialist Consultation: Consult a cardiologist or immunologist for interpretation.
Additional Supporting Tests: CRP, lipid panel, or imaging to confirm diagnosis.
Test Limitations: Non-specific for acute events; correlation needed. Fasting variability may affect accuracy.
References: ASN Guidelines, 2023; Journal of Nutrition, Holman RT, 2022.
