Blood Volume Calculator - Calculate Your Average Blood Volume

Blood Volume Calculator - Calculate Your Average Blood Volume

Blood Volume Calculator

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Blood Volume

  • Blood volume (BV) means the amount of blood in your body, compared to what is considered normal.
  • Blood volume is most often done in people who are in intensive care with conditions such as kidney, liver, or heart failure.
  • Blood volume helps providers assess the severity of these conditions and make appropriate treatment decisions.

 

How to use the Blood Volume Calculator

  1. Enter Your Age in the Blood Volume Calculator.
  2. Select Your Gender
  3. Enter Your Weight & Height
  4. Calculate Your Blood Volume in the ml range.

Calculator for Estimated Blood Volume

The calculator performs the following equation:

  • Average blood volume = Patient weight (kg) * (Average blood volume in mL/kg)

Whereby, the average blood volume per demographic (mL/kg)

  • Adult male = 75
  • Adult female = 65
  • Infants = 80
  • Neonates = 85
  • Premature neonates = 95

 

Blood Volume Calculator Formula

  • Two equations exist for estimating blood volume given the gender, height (H), and weight (W) of the patient.
  • The Nadler equation is built upon the work of Dr. Allen in 1962, while Lemmens - Bernstein- Brodsky equation is more accurate for higher ranges of body weight and body mass indices in patients without critical illnesses.

 

Nadler's Equation for total blood volume

  • An advanced formula used to calculate blood volume was developed by Dr. Allen in 1956.
  • In 1962, based on Dr. Allen's work, Dr. Nadler found more accurate coefficients and published the equation in his article titled Prediction of blood volume in normal human adults.

 

Our blood volume calculator uses this formula:

For Males

BV = 0.3669 × h³ + 0.03219 × w + 0.6041

 

For Females

BV = 0.3561 × h³ + 0.03308 × w + 0.1833 [1]

 

We can use Nadler's formula to, for example, compute the proper immunoglobulin dose in pregnancy.

 

The lemmens-Bernstein-Brodsky equation for estimated blood volume

  • In 2006, Dr. Lemmens, Dr. Bernstein, and Dr. Brodsky discovered an equation that allows physicians to predict BV over the full spectrum of body weights and body mass indices (BMI) in patients unstressed by acute trauma or critical illness.

 

The blood volume calculator uses this formula[2]

BV = Weight × 70 / √(BMI / 22)

 

  • Blood volume refers to the total amount of fluid circulating within the arteries, capillaries, veins, venules, and chambers of the heart at any time.
  • The components that add volume to blood include red blood cells (erythrocytes), white blood cells (leukocytes), platelets, and plasma.
  • Plasma accounts for about 60% of total blood volume, while erythrocytes make up roughly 40%, along with leukocytes and platelets.
  • The amount of blood circulating within an individual depends on their size and weight, but the average human adult has nearly 5 liters of circulating blood.
  • Women tend to have a lower blood volume than men.
  • However, a woman's blood volume increases by roughly 50% during pregnancy.
  • Blood volume is tightly regulated and related to multiple organ systems.
  • Furthermore, it is closely associated with sodium content and hydration status.
  • The maintenance of blood volume is crucial to normal function as it is necessary for the constant perfusion of body tissues.
  • Blood volume can be increased or decreased by systemic dysfunction.
  • Changes in blood volume can result in various clinical scenarios such as hypovolemic shock or edema.

 

Total Blood Volume

  • Total Blood volume refers to the total amount of fluid circulating within the arteries, capillaries, veins, venules, and chambers of the heart at any time.
  • The components that add volume to blood include red blood cells (erythrocytes), white blood cells (leukocytes), platelets, and plasma.

 

Patient Blood Volume

  • The average patient blood volume of an adult is about 5 liters.
  • Many factors can disrupt blood volume and cause it to become too high (hypervolemia) or too low (hypovolemia).

 

Hypervolemia

Hypervolemia can lead to an increase in blood volume including:

  • Kidney conditions such as kidney failure and nephrotic syndrome.
  • Liver failure.
  • Congestive heart failure.
  • Excessive sodium intake.

 

Symptoms of hypervolemia may include:

  • High blood pressure.
  • Congestive heart failure.
  • Shortness of breath due to fluid buildup in the lungs.
  • Abdominal swelling and discomfort (ascites).
  • Swelling (edema), usually of the feet, ankles, wrists, or face.

 

Hypovolemia

The main causes of low blood volume are:

  • Blood loss (hemorrhage).
  • Dehydration.

 

When your blood volume drops, hypovolemic shock can occur. This occurs when your body compensates for reduced blood flow by:

  • Decreasing blood pressure.
  • Increasing heart rate.
  • Increasing breathing rate.

 

Continued blood volume loss can eventually cause irreversible damage to your internal organs and brain.

 

Estimate Patient Blood

Your blood contains:

  • Plasma: The liquid component of your blood. Over 90% of plasma is water.
  • Platelets: Cells that help with blood clotting.
  • Red blood cells: Round-shaped cells that carry oxygen to your body tissues.
  • White blood cells: Immune system cells that help protect your body against infections.
  • Platelets and white blood cells are very important but they make up only a small fraction — less than 1% — of your blood volume.
  • Blood volume tests measure primarily plasma and red blood cells.
  • A blood volume test is also called a plasma volume test or red cell mass test.

 

Calculate Blood Volume

  • Drlogy Blood Volume calculator enables one to find the total volume of blood in an individual's body.
  • A condition wherein there is a severe low blood volume is medically known as hypovolemia.
  • Likewise, a condition where there is high blood volume is called hypervolemia.
  • Both can prove fatal and can lead to adverse health conditions.
  • So, it becomes all the more important to calculate the level of blood volume a body has.
  • The blood volume calculation is needed by doctors in the diagnosis and treatment of various medical conditions including but not limited to kidney failure, hypertension, and congestive heart failure.

 

Blood Volume Building

Here is how much blood you can lose in blood volume building. Doctors categorize hemorrhagic shock into four classes based on how much blood is lost. In class IV, the amount of blood loss can be fatal. 

 

  Class I Class II Class III Class IV
Blood Loss (mL) up to 750 750 to 1,000 1,500 to 2,000 greater than 2,000
Blood Loss (% of blood volume) up to 15 15 to 30 30 to 40 greater than 40
Pulse rate (per minute) less than 100 100 to 120 120 to 140 greater than 140
Blood Pressure normal or increased decreased decreased decreased
Respiratory Rate (per minute) 14 to 20 20 to 30 30 to 40 greater than 35
Urine Output (mL per hour) greater than 30 20 to 30 5 to 15 negligible
Mental Status slightly anxious mildly anxious anxious, confused confused, lethargic

 

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FAQ

How do you calculate blood volume?

You can calculate blood volume using a blood volume calculator or you can use this Nadler's formula:

1. Nadler's Equation

  • For Males

BV = 0.3669 × h³ + 0.03219 × w + 0.6041

 

  • For Females

BV = 0.3561 × h³ + 0.03308 × w + 0.183

 

2. Lemmens-Bernstein-Brodsky equation

BV = Weight × 70 / √(BMI / 22)

What is total blood volume?

Blood volume means the amount of blood in your body, compared to what is considered normal. Blood volume is most often done in people who are in intensive care with conditions such as kidney, liver, or heart failure. Blood volume helps providers assess the severity of these conditions and make appropriate treatment decisions.

What is average blood volume should be?

The average blood volume per demographic (mL/kg)

  • Adult male = 75
  • Adult female = 65
  • Infants = 80
  • Neonates = 85
  • Premature neonates = 95
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