Peter Bond on steroids and their effect on hematocrit and hemoglobin: "The use of anabolic steroids can lead to a condition called erythrocytosis. It’s a condition in which your body has too many red blood cells in its blood... When hematocrit gets too high, a different problem arises. The higher it is, the ‘thicker’ your blood becomes: it increases the viscosity of blood. This carries an increased risk of thrombosis. Let’s take a look at how anabolic steroids increase hematocrit and by how much. After that, let’s look at the risk of thrombosis and what might be done about it."
https://thinksteroids.com/articles/anabolic-steroids-red-blood-cells-erythrocytosis-polycythemia/
https://thinksteroids.com/articles/anabolic-steroids-red-blood-cells-erythrocytosis-polycythemia/