Fetal RhD test
Tells an RhD negative mother whether her baby is RhD positive, so anti-D can be targeted rather than given routinely.
What it measures
Who it's for
Pregnant and RhD negative, wanting to know before birth whether the baby is RhD positive and anti-D injections are needed. Adults aged 18 and over.
What you'll learn, and what you won't
About one in six Australian women is RhD negative. If the baby is RhD positive, anti-D immunoglobulin during pregnancy prevents the mother's immune system reacting. A cell-free DNA test reads the baby's RHD gene from the mother's blood, so anti-D can be given only when it is needed. Your treating obstetrician or midwife decides the anti-D plan; we give them the result.
A genetic test is one input to a doctor's assessment, not a diagnosis on its own. If anything needs prompt attention a doctor contacts you directly.
How it works
- Order online. Either use the request your own doctor has signed, or a KnowLuna women's health doctor reviews your details and requests the test.
- Give your sample; collection details are confirmed at launch. From 11 weeks of pregnancy, for women whose blood group is RhD negative. No fasting.
- Results are ready about 7 to 10 business days from collection, explained in your account, with a doctor to talk them through and a genetic counsellor where a result calls for it.
How you collect
Sample collection details are confirmed at launch. Whichever option applies to this test, it is the same accredited test and the same report.
Common questions
Is this covered by Medicare?
Not at present. Some public hospitals offer it within antenatal care; ask your midwife or obstetrician first. Through KnowLuna it is self-pay.
What if the result is RhD negative?
Then the baby cannot sensitise you and routine anti-D is not needed, which your care provider confirms. A result is always sent to your treating doctor or midwife.
Then decide.