Anti-D injection dose during pregnancy

There is no single dose suitable for every situation. The maternity team follows the instructions for the available anti-D preparation and its clinical protocol, so a dose seen on another person's record may not apply to you.

Routine antenatal prevention and treatment after a potentially sensitising event are different situations. Events can include vaginal bleeding, abdominal trauma, pregnancy loss, or a procedure that may allow fetal red blood cells to enter the maternal circulation.

Later in pregnancy, a blood test may be used after an event to estimate the fetal blood-cell transfer. If the transfer exceeds what the initial dose covers, the team can arrange additional anti-D and any repeat testing required. Product strengths and labels can also differ.

Contact your maternity service promptly after bleeding, an injury to the abdomen, pregnancy loss, or an invasive procedure. Give the date and time of the event, your gestational stage, and details of any anti-D already received during this pregnancy.

Bring your maternity record if available and confirm whether immune anti-D antibodies have previously been detected. Do not combine, repeat, or alter injections yourself. A clinician or pharmacist should verify the named product, route, dose, batch documentation, and whether follow-up blood sampling is needed.

Go for urgent assessment after significant abdominal trauma, or if you have heavy vaginal bleeding, severe abdominal pain, contractions, fluid leaking from the vagina, fainting, or reduced fetal movement once movements are established. After an injection, difficulty breathing, facial or throat swelling, widespread hives, or collapse requires emergency help.

Ask which event or routine schedule the dose covers, which product is being used, whether a fetal blood-cell test is appropriate, and how you will know if more anti-D is required. Request that every administered dose is entered in your maternity record.