Kleihauer-Betke Fetal Hemoglobin % and RhIg vial calculator
This site uses cookies to offer you a better browsing experience. By continuing to access the web site, you agree that we will store personal data in a cookie as outlined in our Privacy Policy, which is also accessible from the sidebar.
Sign up to save, edit, and PDF your reports and access more resources.
Useful information
How to use the counter
Count the fetal and regular RBCs using the red and blue buttons
The red is for fetal red blood cells, blue for maternal
Your fetal RBC percentage and RhIg dose is calculated in real time
Provide pertinent maternal vital information for more accurate dosing
Manually input values
You may have an automated digital image counter or a tech who counts the ratio
Instead of manually counting, you can directly input the fetal hemorrhage percentage
You can also estimate the maternal red blood cell number and manually enter it without all that tapping. A 400x field of view in a person with normal normocytic red blood cells is about 2500
Provide pertinent maternal vital information for more accurate dosing
About the calculation
RHIG calculation is based on the fetal RBC%, and the maternal volume
The quick and dirty calculation assumes a maternal blood volume of 5000ml
Recently, the CAP published a calculator which incorporates more accurate estimation of maternal blood volume, using known maternal height and weight
You have the option to use the standard or more accurate RhIg dosing calculation, if you know the maternal height/weight data
Two button counter
Enter maternal information for more accurate dosage