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Vital signs. 1  High temperature, increased heart rate, decreased blood pressure, and faster breathing are signs of potential dehydration and other illnesses. 2  Taking the pulse and blood pressure while the person is lying down and then after standing up for one minute can help determine the degree of dehydration.
Dehydration produces a falsely high hemoglobin measurement that disappears when proper fluid balance is restored. Some other infrequent causes are high hemoglobin levels are: 1  advanced lung disease (for example, emphysema);  certain tumors;