Content

• Steps
• Method 1 of 3: Counting Blood Volume in Men
• Method 2 of 3: Counting a Woman's Blood Volume
• Method 3 of 3: Calculating a Child's Blood Volume Based on Age

There are many reasons a physician may need to calculate the volume of blood circulating, for example, before surgery to calculate anesthesia or to calculate the amount of blood donated. Blood volume can be calculated in different ways, and each of them gives different results, which, however, are not very different.

Steps

Method 1 of 3: Counting Blood Volume in Men

1. 1 Nadler's equation. This method calculates the total blood volume in milliliters. To calculate, you need to know your height in inches and your weight in pounds. Nadler's formula: (0.006012 x Height${ displaystyle ^ {3}}$) + (14.6 x Weight) +604.
   • If you know your height in centimeters and your weight in kilograms, then first convert the data to inches and pounds, respectively. 1 cm equals 0.39 inches, 1 kg equals 2.2 lbs.
   • Calculate the height using the formula. Raise the height in inches to the 3rd power and multiply by 0.006012.
   • Calculate the weight using the formula. Multiply your weight in pounds by 14.6.
   • Add up your results and add 604.
2. 2 Counting the volume of circulating blood. This method determines the average blood value in milliliters per kilogram of body weight. This method is also a reference.
   • Weight should be in kilograms. If you know the weight in pounds, convert it to kilograms, 1 pound is 0.45 kilograms.
   • Multiply the weight in kilograms by the average for men: 75 milliliters of blood for every kilogram of body.
   • With this method, you can calculate the volume of blood in milliliters.
3. 3 Make adjustments as needed using Gilcher's Rule of Five. Not all tissues have the same amount of blood. This implies differences in obese or wasting people. Gilcher's Rule of Five makes adjustments to calculate blood volume per kilogram of weight. When calculating the total blood volume, the weight in kilograms must be multiplied by one of the following values:
   • A sports man has 75 ml of blood per kilogram of weight.
   • A normal man has 75 ml per kilogram of weight.
   • A thin man has 65 ml / kg.
   • In obese men - 60 ml / kg.

Method 2 of 3: Counting a Woman's Blood Volume

1. 1 Nadler's equation. The result of the equation will show the total blood volume in milliliters. To calculate, you need to know your height in inches and weight in pounds and plug the values ​​into the following formula: (0.005835 x Height${ displaystyle ^ {3}}$) + (15 x Weight) +183.
   • Convert height in centimeters to inches and weight in kilograms to pounds. 1 centimeter is 0.39 inches. 1 kilogram is 2.2 pounds. Skip this step if the weight and height values ​​are already in inches and pounds.
   • Plug growth into the formula. Raise the height in inches to the 3rd power and multiply by 0.005835.
   • Plug the weight into the formula. Multiply your weight in pounds by 15.
   • Add up your results and add 183.
2. 2 Assessment of total blood volume. This method is based on the average amount of blood in milliliters per kilogram of a woman's weight.
   • Weight should be in kilograms. If you need to convert pounds to kilograms, use the proportion of 1 pound - this is 0.45 kg.
   • Multiply your body weight in kilograms by the average for women: 65 ml of blood per kilogram of body.
   • This method will calculate the volume of blood in milliliters.
3. 3 Make adjustments using Gilcher's rule of five. The amount of blood in the fat tissues and in the muscles is different. Gilcher's Rule of Five adjusts the value based on body weight. If you know the weight in pounds, convert the value to kilograms by multiplying the value by 0.45. Multiply the weight in kilograms by the following value, depending on the physical shape of the body:
   • For athletic women - 70 ml per kilogram of weight.
   • In women with normal physical condition - 65 ml / kg.
   • For thin women - 60 ml / kg.
   • In obese women - 55 ml / kg.

Method 3 of 3: Calculating a Child's Blood Volume Based on Age

1. 1 Weigh your child. Weigh your baby to determine the exact weight in kilograms. Baby's weight changes quickly, especially after birth, so weighing is necessary.
   • Write down the resulting weight in kilograms.
2. 2 Determination of blood volume in a child. If you know the age of the child, then use the following scale:
   • A newborn, who is 15-30 minutes old, has an average of 76.5 ml of blood for every kilogram of weight.
   • A newborn over 24 hours old has 83.3 ml of blood per kilogram of weight.
   • A three-month-old child has 87 ml / kg.
   • A six-month-old has 86 ml / kg.
   • In children from one to 6 years old - 80 ml / kg.
   • A ten-year-old child has 75 ml / kg.
   • A fifteen-year-old teenager has 71 ml / kg. Adolescents who have reached the size and proportions of an adult have the same amount of blood per kilogram of weight as an adult.
3. 3 Counting blood volume. Multiply the child's weight by the factor for their age group. As a result, you will get the blood volume.
   • When using different methods, the obtained values ​​may differ slightly from each other.
   • Results may also vary slightly, as the calculation uses averages for children of similar age and body size.