While fasting remains a standard recommendation for establishing reliable baselines for specific metabolic biomarkers like lipids and targeted therapies, recent evidence shows that nonfasting blood tests can also yield clinically valid measurements for many routine assessments.
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The retrieved literature contains mixed evidence regarding the necessity of fasting for biomarker accuracy. Studies such as [7] and [11] emphasize the traditional recommendation or observed shifts in specific lipids and minerals due to fasting. Conversely, studies like [9] and [11] (which demonstrates minimal postprandial difference in phosphorus/calcium levels) support the clinical utility and adequacy of nonfasting blood draws. Therefore, the claim is best classified as CONTESTED because practice and necessity vary depending on the specific biomarker panel being evaluated.