The problem is that most of the heat transfer in an oven is radiant, so a transparent liquid in a transparent dish is going to get very little heat transfer. Though the air is transparent as well, it need much less heat to get to temperature than water does. One option is to use a non-transparent dish.
The emergency treatment of polycythemia (e.g., in hyperviscosity or thrombosis) is by venesection, the removal of blood from the circulation. Depending on the underlying cause, venesection may also be used on a regular basis to reduce the red blood cell count.
Each year, only about five new cases of polycythemia in 1 million are diagnosed, according to the University of Iowa. It can affect anyone at any age, but is most commonly diagnosed in men over the age of 60. While some may not experience any symptoms, others may bruise or bleed easily with little or no injury.