What is the proportion of total body blood volume to one's own weight

The total body blood volume accounts for about 7% -8% of one's body weight, and the specific proportion is influenced by factors such as age, gender, physical condition, and health status.

1. Age factor:

Newborns have the highest proportion of blood volume, accounting for about 10% of body weight, which gradually decreases with age. Maintain at 8% -9% during childhood and stabilize at 7% -8% in adulthood. Older people may experience a slight decrease in blood volume ratio due to reduced muscle mass.

2. Gender differences:

Men generally have higher blood volume than women, with an average of 70-80 milliliters of blood per kilogram of body weight in men and 65-75 milliliters in women. This is related to the fact that male muscle tissue is more developed and testosterone levels are higher.

3. Constitutional influence:

Obese individuals may have lower blood volume ratios than those with standard body weight due to less vascular distribution in adipose tissue. Athletes can have a blood volume ratio of 8% -9% due to their high muscle mass. Pregnant women's blood volume will increase by 30% -50% to meet the needs of the fetus.

4. Health status:

Patients with chronic anemia may have a normal blood volume ratio but a decreased hemoglobin concentration. During dehydration, blood concentration occurs and the proportion of blood volume pseudo increases. Heart failure patients may experience compensatory increase in blood volume.

5. Measurement method:

Clinically commonly used radioactive isotope labeling method or dye dilution method to determine blood volume. The estimation formula is: male blood volume=body weight kg × 70ml/kg, female blood volume=body weight kg × 65ml/kg.

To maintain normal blood volume, it is necessary to ensure a daily intake of 1500-2000 milliliters of water and supplement iron containing foods such as animal liver and red meat in moderation. Regular aerobic exercise can promote hematopoietic function, and it is recommended to engage in activities such as brisk walking and swimming for at least 30 minutes 3-5 times a week. To avoid poor blood circulation caused by prolonged sitting, attention should be paid to hemoglobin and hematocrit indicators in the blood routine during regular physical examinations. After donating blood, it is recommended to supplement fruits rich in vitamin C to help with iron absorption, but it is necessary to donate blood again at least 6 months apart to ensure blood regeneration.