Rhesus Negative Test

Your Baby's Blood Group and Anti D

In all pregnancies the mother’s blood group is checked. Should the mother be Rhesus Negative (15% chance in white Europeans) and the father be Rhesus Positive (85% chance in white Europeans) then the baby has a 66% chance of being Rhesus Positive and 33% chance of being Rhesus Negative. If the mother is Rhesus Negative and the baby is Rhesus positive, then there is a small chance that baby’s blood cells can cross to the mother’s circulation and set up an antibody response which can cross back and damage the baby. This can be prevented by giving all mothers an injection of Anti D immunoglobulin. This is manufactured safely from human blood products. However, in 33% of cases the injection is unnecessary.

The routine injection for all mothers has been necessary because until recently it was difficult to know the baby’s blood group when still in the womb. The technology which gives us NIPT (Non-Invasive Prenatal Testing) for Down’s syndrome is also used, by a different laboratory, for NIPT to determine the baby’s blood group. This is done by taking a simple blood sample from a vein in the mother’s arm and sending it to a specialised laboratory. Within a few days the mother will be advised of the baby’s blood group. Should it be Rhesus Negative then nothing more needs done, and you do not require the Anti D injections. Should the baby be Rhesus Positive you will need to discuss the need for an Anti D injection with a midwife. The NHS accept these results. In fact, the test is done in an NHS laboratory although it is generally not available in NHS care.

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The cost is £100

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Clinic Locations

Visit our clinic in Central London and Cheshire

THE BIRTH COMPANY - LONDON

137 Harley Street, London W1G 6BF
Nearest Underground Tube Stations

Baker Street
Regent’s Park
Great Portland Street

THE BIRTH COMPANY - CHESHIRE

Festival Hall, Talbot Road, Alderley Edge, Cheshire, SK9 7HR
Nearest Overground Train Station

Alderley Edge