Overview: Selenium Serum TestIntroduction: The Selenium Serum Test measures selenium in serum to diagnose deficiency, causing muscle weakness. Following 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 deficiency.
Other Names: Serum Selenium Assay, Blood Selenium Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: Selenium serum testing began in the 1970s with nutritional research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures selenium in serum to diagnose deficiency, guides treatment, and evaluates patients with muscle weakness.
Test Parameters: 1. Selenium Level
Pretest Condition: Fasting for 10-12 hours required. Collect serum or plasma. Report history of muscle weakness or selenium deficiency symptoms.
Specimen: Serum (SST, 2-5 mL), Plasma (EDTA, 2-4 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document muscle weakness, fatigue, or history of selenium deficiency. Include current medications, especially selenium supplements.
Consent: Written consent required, detailing the tests purpose, selenium deficiency 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 deficiency diagnosis.
Factors Affecting Result Accuracy: Improper fasting or sample hemolysis can affect results. Recent supplementation may elevate levels.
Clinical Significance: Low selenium levels confirm deficiency, guiding supplementation. Normal or high levels may require urine selenium testing.
Specialist Consultation: Consult an endocrinologist or nutritionist for result interpretation and treatment planning.
Additional Supporting Tests: Urine selenium, thyroid function tests, or clinical evaluation to confirm selenium deficiency diagnosis.
Test Limitations: Non-specific for certain metabolic conditions; clinical correlation is needed. Sample quality affects sensitivity.
References: AACC Selenium Guidelines, 2023; Clinical Chemistry, Combs GF, 2022.
