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In this "Ask Me Anything" (AMA) episode, Peter explores what laboratory testing can—and cannot—tell us about our health. Blood tests provide objective numbers and reference ranges, making them an appealing way to assess overall health. But their usefulness is far more nuanced than it may appear. Peter begins by explaining how to interpret lab results in the context of both lifespan and healthspan, emphasizing the importance of tracking changes over time rather than relying on isolated measurements. He then examines the strengths and limitations of blood testing for assessing risk across the major chronic diseases, including cardiovascular disease, metabolic dysfunction, cancer, and neurodegenerative disease. He explains what labs can reveal about organ health and where additional information from imaging, body composition, and functional testing is needed. The conversation also explores why more testing does not necessarily lead to better clinical decisions. Peter discusses the limitations of large direct-to-consumer testing panels and sophisticated measures such as lipid subfractionation and biological-age scores, particularly when the results lack clear clinical actionability. He also highlights the importance of physical function, cognitive performance, and emotional health—critical components of healthspan that cannot be adequately captured through blood work alone. Finally, Peter provides a practical framework for evaluating any laboratory test, understanding its limitations, and determining whether the results offer meaningful information that can guide decisions about health and longevity.
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