![]() ![]() This is because neither parent has a positive gene to pass on.Īll pregnant women are offered blood tests early in pregnancy to find out their blood group and rhesus status. If both parents are RhD-negative (- and -), there’s no chance that any of their babies could be RhD-positive.If one parent is RhD-negative and one parent is RhD-positive but carrying a negative gene (- and +-), there is an 50/50 chance that the baby could be RhD-positive or RhD-negative.However, it’s also possible for those same parents to have a RhD-negative child if they both pass on their negative gene to their baby. If both parents are RhD-positive but both carry one positive and one negative gene (+- and +-), there is a three in four chance that their baby will be RhD-positive, too.If both parents are RhD-positive (++ and ++ or ++ and +-), their baby will be RhD-positive too because even if one parent carries a negative gene it loses out to the positive gene from the other parent.If your baby inherits two negative genes, they will be RhD-negative.Ī baby's chance of being RhD-positive is as follows:.If your baby inherits one positive and one negative gene, they will be RhD-positive.If your baby inherits two positive genes they will also be RhD-positive.The positive gene is dominant and always wins out. These genes are either positive or negative. Most of us are RhD-positive because we each inherit two copies of the rhesus gene, one from each parent. In the UK, around 85 per cent of the population have RhD-positive blood. We inherit the rhesus factor from our parents. If you’re RhD-negative, you don’t have this. People who are RhD-positive have a protein on their red blood cells called D antigen. What does matter is the rhesus factor, whether you’re rhesus-positive (RhD-positive) or rhesus-negative (RhD-negative). Except in very rare cases, it doesn’t matter if you’re a different blood group to your baby’s dad. All of us belong to one of four blood groups: A, B, AB or O.
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