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Rh Incompatibility

Also known as: Erythroblastosis Fetalis, Hemolytic Disease of Newborn

Blood, Heart and Circulation | Pregnancy and Reproduction

What is the Rh factor?<p>There are four major blood types: A, B, O, and AB.

The types are based on substances found on your blood cells.

Your blood type also has a positive or negative sign.

This is called Rh factor, which is a protein.

If your blood cells have this protein, you are Rh-positive.

If you don't, you are Rh-negative.</p><p>Rh factor is inherited (passed down through families).

Most people are Rh-positive, meaning they have the Rh factor.

Rh-negative people don't have it.

Being Rh-negative doesn't affect your health, but it can affect the health of your fetus if you are pregnant.</p>What is Rh incompatibility?<p>If you are pregnant and are Rh-negative and your fetus is Rh-positive, it's called Rh incompatibility.

Blood from your fetus can cross into your bloodstream, especially

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