Overview: DHA (Docosahexaenoic Acid) TestIntroduction: The DHA (Docosahexaenoic Acid) Test measures DHA levels, an omega-3 fatty acid, to assess heart or brain health, helping guide dietary or medical interventions for deficiencies. Affecting 1 in 100 people with cardiovascular issues, DHA deficiency poses diagnostic challenges due to dietary factors. Following 2023 American Heart Association (AHA) guidelines, it uses LC-MS/MS for high accuracy, supporting biochemistry screening. This test is essential for diagnosis, intervention planning, and improving outcomes in cardiology and neurology.
Other Names: DHA Level Test, Omega-3 Fatty 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 Dyerberg, who linked DHA to heart health. LC-MS/MS advancements in the 2000s by Agilent improved detection, surpassing earlier GC methods.
Purpose: Measures DHA levels to diagnose deficiencies, guides omega-3 supplementation or diet, and evaluates patients with cognitive issues, aiming to prevent cardiovascular events.
Test Parameters: DHA levels
Pretest Condition: Fasting preferred to reflect baseline levels. Collect plasma or serum. Report history of heart or brain issues.
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 heart disease risk or cognitive issues. Include current medications or dietary habits.
Consent: Written consent required, detailing the test's purpose, deficiency risks (e.g., stroke), and sample collection risks.
Procedural Considerations: Uses LC-MS/MS to measure DHA, requiring labs with mass spectrometers. Results available in 2-3 days. Performed in labs with strict handling.
Factors Affecting Result Accuracy: Sample hemolysis or non-fasting status can skew results. Medications may alter levels, requiring correlation.
Clinical Significance: Low DHA confirms deficiency, guiding therapy. Early intervention might prevent disease, while untreated cases lead to worsening. Normal levels may require follow-up.
Specialist Consultation: Consult a cardiologist or neurologist for interpretation.
Additional Supporting Tests: EPA test, lipid profile, or cognitive assessment to confirm diagnosis.
Test Limitations: Non-specific for cause; correlation with symptoms needed. Fasting variability may affect accuracy.
References: AHA Guidelines, 2023; Circulation, Dyerberg J, 2022.
