Overview: Arsenic TestIntroduction: The Arsenic Test measures arsenic levels to detect poisoning, which may cause nausea, fatigue, or nerve damage from exposure. Aligned with 2023 ATSDR guidelines, it uses chromatography for high sensitivity, aiding in toxin screening. This test is critical for guiding diagnosis, treatment, and improving outcomes in toxicology for patients with suspected arsenic exposure.
Other Names: Arsenic Urine Assay, Heavy Metal Toxicity Test.
FDA Status: Laboratory-developed test (LDT), meeting toxicology standards for diagnostic accuracy.
Historical Milestone: Arsenic testing began in the 1900s with chemical assays. Chromatography methods emerged in the 1970s, and by the 2000s, high-performance liquid chromatography improved detection accuracy.
Purpose: Diagnoses arsenic poisoning, guides treatment, and monitors exposure in patients with nausea, fatigue, or nerve damage.
Test Parameters: 1. Arsenic
Pretest Condition: No fasting required. Collect urine, blood, hair, or nails at any time. Report symptoms like nausea or nerve damage, and list potential exposure sources (e.g., water, food).
Specimen: 50-100 mL 24-hour urine (sterile container), 2-5 mL whole blood (EDTA), 1-2 g hair (sterile container), or 0.5-1 g nails (sterile container). Transport in a biohazard bag within 2 hours.
Sample Stability at Room Temperature: 2 hours
Sample Stability at Refrigeration: 24 hours
Sample Stability at Frozen: Not frozen
Medical History: Document symptoms of arsenic poisoning, occupational or environmental exposure, or family history of heavy metal toxicity. Include current medications or chelating agents.
Consent: Written consent required, detailing the tests purpose, implications for toxicity treatment, and potential need for chelation therapy.
Procedural Considerations: Uses chromatography (e.g., HPLC) to measure arsenic levels. Results are available in 1-2 days, supporting rapid clinical decisions.
Factors Affecting Result Accuracy: Recent seafood consumption may elevate organic arsenic levels, causing false positives. Improper storage can degrade samples.
Clinical Significance: Elevated arsenic levels confirm poisoning, prompting chelation therapy or exposure removal. Normal levels may require repeat testing.
Specialist Consultation: Consult a toxicologist for result interpretation. An environmental medicine specialist referral is advised for exposure assessment.
Additional Supporting Tests: Heavy metal panel, urine creatinine, or nerve conduction studies to confirm arsenic toxicity or assess organ damage.
Test Limitations: Organic vs. inorganic arsenic differentiation may require speciation testing. Results require clinical correlation.
References: ATSDR Arsenic Guidelines, 2023; Environmental Health Perspectives, Navas-Acien A, 2022.
