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Newborn screening: Your baby carries a gene for Haemoglobin O Arab

Updated 2 December 2021

Public Health England (PHE) created this information on behalf of the NHS. In this information, the word ‘we’ refers to the NHS service that provides screening.

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Your baby had a blood test, also known as the heel-prick test, about a week after they were born. The test is to check for rare diseases and is offered to all babies.

One of these tests is to check for sickle cell disease and thalassaemia. Your baby has neither condition .

However, the results show your baby carries one unusual gene for haemoglobin called Haemoglobin O^Arab and one usual gene. This is written as Hb A O^Arab and is known as being a carrier of Haemoglobin O^Arab.

Every year in England, about 90,000 babies are born with a gene for unusual haemoglobin. Some are more common than others.

Haemoglobin O^Arab occurs in very small numbers.

Haemoglobin is the substance in the blood that carries oxygen around the body.

This information explains what being a carrier of an unusual haemoglobin gene means for your baby, you and your wider family.

Your baby

A carrier of Haemoglobin O^Arab is healthy and no medical help will be needed to lead a normal life.

However, their blood cells are often smaller than usual and their haemoglobin level is lower than normal. This is different to iron deficiency anaemia. Always inform your healthcare professional of your baby’s carrier status so they can check your baby’s iron levels before giving iron supplements.

Haemoglobin O^Arab is not the same as Haemoglobin S (sickle cell). A carrier of Haemoglobin O^Arab does not carry sickle cell. However, it’s important that your baby grows up knowing about being a Haemoglobin O^Arab carrier and understands the risks if they want to have a family.

If they have a baby with someone who is a Haemoglobin S carrier, there would be a 1 in 4 (25%) chance that their baby would have Haemoglobin S O^Arab disease which is a sickle cell disorder and would require life long treatment.

When your baby grows up they can ask any future partner to have a test to see if they also carry an unusual haemoglobin gene. There is NHS counselling to explain the risks and choices involved.

Carriers of unusual haemoglobin genes

Babies inherit characteristics from their parents’ genes. For example, genes control the colour of their skin, hair and eyes.

For each characteristic, your baby gets one gene from their biological mother and one from their biological father. Genes also control the type of haemoglobin they inherit.

Your baby is a carrier because they inherited one gene that makes usual haemoglobin from one parent and one gene makes unusual haemoglobin from the other parent.

Your baby will never develop a haemoglobin disorder because they inherited one usual gene, but they will always be a carrier.

Protection against malaria

There is some evidence that being a carrier of an unusual haemoglobin gene gives children some protection against malaria, but only during the first couple of years of their life.

It is important your child takes all the normal precautions if they are travelling to a country where there is a risk of malaria. This includes taking anti-malaria medication.

Future pregnancies and your wider family

Your baby inherited an unusual gene from either you or your partner. This means that you, your baby’s father, or both of you are also carriers.

We recommend both you and your partner get a test to find out who is a carrier if you were not already given this information during pregnancy. This is particularly important if you are thinking of having another baby. If both of you are carriers, then your next baby could have a haemoglobin disorder.

The test is a simple blood test and takes just a few minutes. To arrange the test, you can ask your GP, visit your local sickle cell centre or contact a support organisation.

It may be a good idea to encourage other members of your family, such as brothers, sisters, aunts, uncles and cousins, to get a test before they start a family, in case they are carriers too. Showing them this information may help.

More information

NHS.UK

Sickle Cell Society
Email: [email protected] Telephone: 020 8961 7795

The NHS screening programmes use personal information from your NHS records to invite you for screening at the right time. PHE also uses your information to ensure you receive high quality care and to improve the screening programmes. Find out more about how your information is used and protected, and your options.