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Upper Quartile Reference Range

Meaning

The Upper Quartile Reference Range refers to the concentration of a blood biomarker, hormone, or metabolite that falls within the top 25% of the statistically normal range, often derived from a population of healthy young adults. In clinical practice, targeting this range is often considered the optimal zone for peak physiological function and resilience, moving beyond the broad statistical average that merely indicates the absence of overt disease. This is a proactive goal for health optimization.