# Pediatric Blood Transfusion Volume Calculator

*“Calculating the required transfusion volume in children“*Transfusion (Jan 2007)

Our pediatric blood transfusion volume calculator uses a formula for blood transfusion volume described in an article titled * Calculating the required transfusion volume in children* written by Drs. Davies P, Robertson S, Hegde S, Greenwood R, Massey E, and Davis P from the Paediatric Intensive Care Unit, Bristol Royal Hospital for Children.

This calculator **estimates the blood transfusion volume for children** required to achieve the aimed hemoglobin increment.

*We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace a professional doctor's assessment. If any health condition bothers you, consult a physician.*

## Why do I need a blood transfusion volume calculator?

Estimating the blood transfusion volume for adult patients is very simple. **One unit of packed red blood cells usually raises the hemoglobin concentration by 1 g/dl or hematocrit by 3%**. This transfusion practice is imprecise, but it's widely recognized and applied.

For children, though, it's understandable that a calculation is needed. Their total blood volume can vary substantially depending on their weight and age. The pediatric transfusion volume of blood required for the hemoglobin increment of 1 g/dL administered to an infant is considerably lower than that needed for an adolescent.

Remember to adjust the dosage of medicines for children. You may find our ibuprofen calculator and paracetamol dosage calculator useful.

## Which values do I need to estimate the blood transfusion volume for children?

The values required to calculate the blood volume for transfusion are:

- The patient's
**weight**in kilograms; **Hematocrit**(of the transfused blood) in %; and- The desired
**increment in hemoglobin**in g/dL.

**Hematocrit** is the percentage of the volume of red blood cells in the blood, with **42-65%** for new born babies in the first month, **33-55%** in the second month, **28-41%** from the third to the sixth month, and **31-41%** after the sixth month of life.

For children between 1 and 5 years of age, the norm is 31-44%, and after the fifth birthday, it's roughly 37-48% for males and 34-44% for females.

The **increment in hemoglobin** is the difference between the patient's hemoglobin and the aimed level. Transfusion is usually used to maintain a blood hemoglobin concentration above 10 g/dL.

## What's the formula for blood transfusion volume?

The formula for pediatric blood transfusion volume (BTV) was developed by Drs. Davies P, Robertson S, Hegde S, Greenwood R, Massey E, and Davis P and described in the article *Calculating the required transfusion volume in children* is as follows:

`BTV (mL) = weight (kg) × aimed increment in hemoglobin (g/dL) × 3 / hematocrit`

where `hematocrit`

is expressed as **decimal.**

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