Overview: Zinc Serum TestIntroduction: The Zinc Serum Test measures zinc in serum to diagnose deficiency, causing immune issues. Following 2023 WHO 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 zinc deficiency.
Other Names: Zinc Serum Assay, Plasma Zinc Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: Zinc testing began in the 1970s with nutritional research. Biochemical methods improved in the 2000s, enhancing diagnostic precision for trace elements.
Purpose: Measures zinc in serum to diagnose deficiency, guides treatment, and evaluates patients with immune issues.
Test Parameters: 1. Zinc Level
Pretest Condition: Fasting for 10-12 hours required. Collect serum or plasma. Report history of immune issues or nutritional deficiencies.
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 recurrent infections, immune issues, or history of nutritional deficiencies. Include current medications or dietary history.
Consent: Written consent required, detailing the tests purpose, zinc deficiency implications, and risks of sample collection.
Procedural Considerations: Uses inductively coupled plasma-mass spectrometry (ICP-MS) to measure zinc levels in serum. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories, often for nutritional deficiency diagnosis.
Factors Affecting Result Accuracy: Improper fasting or sample hemolysis can affect results. Zinc supplements or inflammation may alter levels.
Clinical Significance: Low serum zinc confirms deficiency, guiding supplementation therapy. Normal levels may require RBC zinc or dietary assessment.
Specialist Consultation: Consult a nutritionist or immunologist for result interpretation and treatment planning.
Additional Supporting Tests: RBC zinc, copper levels, or immune function tests to confirm zinc deficiency diagnosis.
Test Limitations: Non-specific for deficiency cause; clinical correlation is needed. Sample quality affects sensitivity.
References: WHO Nutrition Guidelines, 2023; Journal of Nutrition, Wessells KR, 2022.
