Hematocrit Blood Test Topic Guide
Hematocrit (Blood Test): A hematocrit blood test measures the portion of red blood cells in the blood. Normal values of hematocrit in the blood vary according to age, sex, pregnancy, altitude where a person lives, and vary slightly between testing methods. Causes of low hematocrit levels in the blood may be due to bleeding disorders, destruction of red blood cells, cancer, anemia, and overhydration. High hematocrit levels may be caused by dehydration, smoking, pulmonary conditions, COPD, sleep apnea, and polycythemia vera.
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Altitude Sickness (Mountain Sickness) Altitude sickness (mountain sickness) is caused when a person's body is not able to adjust to a higher altitude. Acute altitude sickness symptoms fatigue, headache, dizziness, insomnia, nausea, decreased appetite, edema, and social withdrawal. Most cases of altitude sickness are resolved by going to a lower altitude. Altitude sickness can be severe and life-threatening if it progresses to high altitude pulmonary edema (HAPE).