Phenylketonuria

PKU and pregnancy

Source: NHS

Women with PKU have to take particular care during pregnancy, because high levels of phenylalanine can damage the unborn baby.

Providing that phenylalanine levels are strictly controlled during pregnancy, problems can be avoided and there's no reason why a woman with PKU shouldn't be able to have a normal, healthy baby.

It's recommended that all women with PKU plan their pregnancies carefully. You should aim to follow a strict diet and monitor your blood twice a week before becoming pregnant. It's best to try to conceive once phenylalanine levels are within the target range for pregnancy.

During pregnancy, you'll be asked to provide blood samples three times a week and will be in frequent contact with your dietitian. As soon as your baby is born, phenylalanine control can be relaxed and there's no reason why, if you have PKU, you can't breastfeed your baby.

Contact your PKU doctors and dietitians as soon as possible if you become pregnant when your phenylalanine levels aren't adequately controlled. If your phenylalanine levels can be brought under control within the first few weeks of your pregnancy, the risk of damage to the baby should be small. However, your pregnancy will need to be monitored very carefully.

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