Overview: Selenium 24 Hour UrineIntroduction: The Selenium 24 Hour Urine Test measures selenium in urine to diagnose deficiency or toxicity, causing fatigue or nausea. Aligned with 2023 AACC guidelines, it uses biochemical methods for high specificity, supporting metabolic screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in biochemistry for patients with suspected selenium imbalances.
Other Names: Selenium Urine Assay, 24-Hour Urine Selenium Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: Selenium urine testing began in the 1980s with nutritional research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures selenium in urine to diagnose deficiency or toxicity, guides treatment, and evaluates patients with fatigue or nausea.
Test Parameters: 1. Selenium Level
Pretest Condition: No fasting required. Collect 24-hour urine, whole blood, hair, or nails. Report history of fatigue, nausea, or selenium exposure.
Specimen: 24-Hour Urine (sterile container, 50-100 mL), Whole Blood (EDTA, 2-5 mL), Hair (sterile container, 1-2 gm), Nails (sterile container, 0.5-1 gm). Transport in a biohazard container.
Sample Stability at Room Temperature: 2 hours
Sample Stability at Refrigeration: 24 hours
Sample Stability at Frozen: Not frozen
Medical History: Document fatigue, nausea, or history of selenium supplementation/toxicity. Include current medications, especially supplements.
Consent: Written consent required, detailing the tests purpose, selenium imbalance implications, and risks of sample collection.
Procedural Considerations: Uses inductively coupled plasma mass spectrometry (ICP-MS) to measure selenium levels. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories, often for selenium imbalance diagnosis.
Factors Affecting Result Accuracy: Improper sample collection or contamination can affect results. Recent selenium supplementation may elevate levels.
Clinical Significance: Low selenium levels confirm deficiency, guiding supplementation. High levels confirm toxicity, requiring exposure cessation.
Specialist Consultation: Consult an endocrinologist or nutritionist for result interpretation and treatment planning.
Additional Supporting Tests: Serum selenium, thyroid function tests, or clinical evaluation to confirm selenium imbalance diagnosis.
Test Limitations: Non-specific for certain metabolic conditions; clinical correlation is needed. Sample quality affects sensitivity.
References: AACC Selenium Guidelines, 2023; Clinical Chemistry, Rayman MP, 2022.
