I had a blood test done two months back and my RBC was 6.0, hemoglobin 17.2, and hematocrit 51, which were all high especially RBC. The blood test was in the morning and I had not eaten or drunk for eight hours before. I am an 18-year-old 130 lb male, and I was wondering if the blood test was high because I had fasting and it was in the morning. My doctor told me it might be polycythemia and to go back for another test in three months.
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The dehydration for prolonged duration can lead to high RBC count, high hematocrit and high hemoglobin level. But eight-hour fasting cannot lead to such findings. It is advisable to repeat your test after a few days. Until then, keep yourself well hydrated with lots of water. If still, it comes high after a few days, then further workup for polycythemia should be done in form of EPO estimation, chest X-ray, EKG and JAK2 mutation testing as per need.
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