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.
Include a variety of nutrient-rich foods in your diet. Following a special diet can aid in the treatment of a number of chronic diseases, such as diabetes and heart disease. Polycythemia is a rare blood disorder that causes your body to over produce red blood cells, white blood cells and platelets. While no special diet exists to aid in treatment of polycythemia, it is recommended that you eat a well-balanced diet and limit your intake of sodium.