Levels stayed fairly steady in healthy men, with natural variation within each man estimated at 3.5% over four weeks. A Turkey-based study tracked AMH (Anti-Müllerian Hormone) in 20 healthy adult men. This hormone can help assess how the testicles function. Each man gave one blood sample weekly for four straight weeks. All samples were tested using the same type of lab machine. The work took place between November 2024 and March 2025. The key contrast was between personal stability and differences across men. Natural variation within each man was 3.5%. Variation between men was much larger, at 34.72%. In plain terms, each man's levels stayed near his own starting point. But that starting point could differ quite a bit from someone else's. The researchers also estimated how much change could exceed expected variation. Their cutoffs were a rise above 9% or a drop beyond 8.2%. These estimates account for natural changes and variation from lab testing. They are not proof that crossing either cutoff signals a health problem. Your own trend may tell you more than a group range. That was the study's main takeaway for tracking changes over time. Still, this was a small study lasting only four weeks. It does not establish the same pattern in women or people with health conditions. For BioSocial members, this gives repeat bloodwork useful context. Comparing your current result with past results may reveal more than comparing with friends. Community notes can focus on changes over time, rather than whose number is higher. If you've tracked this hormone, how have your results changed between tests?