The red blood cell pressure is the hematocrit. A hematocrit of 49 is normal for men and slightly higher for women. Normal hematocrit values for men are 0.40 to 0.50 and for women are 0.35 to 0.45. If the hematocrit is 0.49, it is within the normal range for a male patient, but it may be higher for a female, and the common causes are either sexually or absolutely elevated. 1. Relative increase: the relative increase of red blood cell volume due to the decrease of plasma volume, which is common in diarrhea, severe vomiting, profuse sweating, and after extensive burns. The hematocrit is also higher in highland people than in plain areas. 2. Absolute increase: common in patients with chronic cardiopulmonary diseases, such as pulmonary heart disease, obstructive emphysema, cyanosis congenital heart disease. Therefore, whether the above values are normal or not should be judged comprehensively, and the results will be affected by different genders, regions, and whether they suffer from other diseases. It is recommended to improve other related examinations and make comprehensive judgment under the guidance of doctors.