Yes—at 2,270 meters, several blood counts rose over six months, while some measures within red blood cells stayed steady. Researchers followed 45 healthy male students from West Africa. They had lived at sea level before moving to southwestern Saudi Arabia. Blood tests took place within 48 hours of arrival, then at two and six months. For this community, one steady measure stands out: MCHC (Mean Corpuscular Hemoglobin Concentration). It measures how concentrated the oxygen-carrying protein is inside red blood cells. This did not change during the study. In contrast, Hemoglobin, the blood’s oxygen-carrying protein, increased at both follow-up tests. So did RBC (Red Blood Cells) and Hematocrit, the share of blood made up of those cells. The source does not give the size of these increases. RDW (Red Cell Distribution Width) fell, meaning red blood cells became more alike in size. Platelets, which help blood clot, stayed steady in number. Their average size increased. Not every blood test number moves together. That is the useful takeaway for members comparing results after a move. A steady cell-level measure can sit alongside rising overall blood counts. This was a small study of healthy men, not a weekend trip. The first test also happened after arrival, rather than before leaving sea level. Logging altitude and time since arrival could add context to uploaded bloodwork. Comparing those details with community peers may make trends easier to discuss. What changes, or steady results, have you noticed in your bloodwork after spending time at a higher altitude?