A 2024 study, led by Nader Rifai of Harvard Medical School and published as a letter in the journal *Clinical Chemistry*, addressed exactly this problem. The study measured lead concentrations in the Bermann Lock and the Halm-Thayer Lock—both authenticated through the 2023 genomic study—using high-precision mass spectrometry. The results found that the authenticated Beethoven hair contained lead at levels approximately 64 times (Bermann Lock) and 95 times (Halm-Thayer Lock) higher than normal baseline levels for an adult.
These are substantial elevations. They indicate significant lead exposure, likely sustained over time rather than from a single acute event. The 2024 study’s authors concluded that Beethoven had been exposed to lead at clinically relevant concentrations. However, they stopped short of saying lead poisoning caused his death, estimating his blood lead concentration at around 69–71 micrograms per deciliter—several times above normal but not at the extreme levels some earlier claims had suggested.
The 2024 finding reinstated lead as a factor in Beethoven’s health story, but on a more measured basis. He was exposed to lead, substantially. That exposure likely contributed to his chronic health burden. It was not, on its own, the cause of his death.
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## Ethics of the Open Archive: Reading the Genome of the Dead
The Beethoven study is one of a growing number of genomic investigations of historical figures, and it exists at the intersection of several ethical considerations that the scientific community has only recently begun to formalize.
The most basic consideration is consent. Beethoven has been dead for nearly two hundred years. No formal consent process was possible. The researchers pointed to the Heiligenstadt Testament’s explicit wish for posthumous medical investigation as the strongest proxy available for consent—and it is, by the standards of historical genomics, a more explicit expression of intent than most subjects of such research have left behind. Most ancient or historical genomes are extracted from individuals who left no written record of their wishes at all.