Forget 'biological age' tests — longevity experts are using an $800 under-the-radar blood test to measure aging in real-time

The proteins in your blood plasma can reveal hidden secrets about your organ health.

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• Doctors and scientists are using a blood plasma test to study longevity.
• The test measures proteins and can tell you about your organ health.
• This field of proteomics could one day help detect diseases like cancer before they start.

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