Used in biomedical research to measure levels of selenoprotein P in human plasma or serum, aiding in the assessment of selenium status and related metabolic functions. Supports studies on selenium deficiency, antioxidant capacity, and liver function. Commonly applied in clinical labs and research settings investigating chronic diseases such as diabetes, cardiovascular conditions, and neurodegenerative disorders where selenium metabolism may be altered. Enables quantitative analysis for monitoring nutritional status and evaluating therapeutic interventions involving selenium supplementation.