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Is it safe? · Pregnancy Smart

RhoGAM Shot During Pregnancy: Why It's Given

Assigned clinical reviewerMatt Stahl· PharmDDraft · pending clinical reviewUpdated

What does the evidence say about RhoGAM immune globulin) during pregnancy?

  1. ACOG recommends Rh immune globulin at 28 weeks for eligible Rh-negative patients and within 72 hours after delivery of an Rh-positive newborn, with additional assessment after specific bleeding, procedures, or trauma. 1
  2. The current RhoGAM label specifies 300 micrograms at 26 to 28 weeks and dosing within 72 hours of suspected or proven Rh-positive red-cell exposure, while contraindicating use in Rh-positive individuals. 2
  3. A current maternal-fetal medicine statement identifies first-trimester blood typing and antibody screening as standard care and recommends Rh immune globulin at 26 to 28 weeks and within 72 hours after an Rh-positive birth. 3
  4. ACOG's 2024 update suggests forgoing routine Rh testing and Rh immune globulin for abortion or pregnancy loss before 12 weeks, with individual shared decisions still possible. This guidance should not be generalized to every bleeding episode in an ongoing pregnancy. 4
  5. SMFM's 2024 statement takes a different approach before 12 weeks: offer Rh testing and Rh immune globulin to unsensitized Rh-negative patients after spontaneous or induced abortion when doing so is feasible and does not hinder access to care. The disagreement reflects limited evidence. 5

Is RhoGAM immune globulin) safe in each trimester?

  • First trimester. Early prenatal blood typing and antibody screening determine whether RhoGAM may help. After first-trimester bleeding, abortion, or pregnancy loss, current guidance depends on gestational age, procedure, and individual circumstances, so contact the obstetric team promptly.
  • Second trimester. RhoGAM is commonly administered at 26 to 28 weeks to an Rh-negative patient who has not formed anti-D antibodies. Amniocentesis, abdominal trauma, bleeding, or another sensitizing event may require a separate dose assessment.
  • Third trimester. After delivery, the newborn's Rh type and the amount of fetal-maternal bleeding guide postpartum dosing. If the newborn is Rh-positive, RhoGAM is generally administered within 72 hours even when an antepartum dose was given.

Frequently asked questions

Why do you need a RhoGAM shot if you are Rh-negative?

An Rh-negative pregnant patient can form anti-D antibodies after exposure to Rh-positive fetal blood. RhoGAM supplies passive anti-D antibodies to reduce that sensitization risk. Without appropriate care, maternal anti-D antibodies can affect an Rh-positive fetus in the current or a later pregnancy.

When during pregnancy is RhoGAM given?

For an eligible Rh-negative patient without anti-D antibodies, routine RhoGAM is commonly given at 26 to 28 weeks. Additional timing may follow bleeding, abdominal trauma, amniocentesis, chorionic villus sampling, fetal procedures, ectopic pregnancy, pregnancy loss, or an attempted external cephalic version.

Do you need a second RhoGAM shot after delivery?

A postpartum RhoGAM dose is generally needed within 72 hours when the newborn is Rh-positive, even if a routine pregnancy dose was given. The care team tests the newborn's blood type and may measure fetal-maternal bleeding to decide whether the standard dose is sufficient.

What happens if you skip the RhoGAM shot?

Skipping indicated RhoGAM leaves an Rh-negative patient at risk of forming anti-D antibodies after Rh-positive blood exposure. Sensitization may not cause symptoms but can lead to fetal anemia in an Rh-positive pregnancy. Once true anti-D sensitization exists, RhoGAM no longer removes it.

Does every Rh-negative pregnant patient need RhoGAM?

Not every Rh-negative patient needs RhoGAM. It is intended for an unsensitized Rh-negative patient who could be carrying an Rh-positive fetus or has a relevant blood exposure. It is not useful after anti-D sensitization is already established, and fetal or partner Rh information can change eligibility.

Is RhoGAM a vaccine?

RhoGAM is not a vaccine. It is a human plasma-derived immune globulin containing antibodies to the RhD antigen. Those passive antibodies act for a limited period, which is why a new at-risk pregnancy, delivery, procedure, or bleeding event can require another dose.

What if I missed the 72-hour postpartum RhoGAM window?

Contact the obstetric team immediately if the 72-hour postpartum RhoGAM window was missed. The recommended goal is administration within 72 hours after an Rh-positive birth, but a late recognition still warrants urgent clinician review rather than assuming that no benefit remains.

Do you need RhoGAM after first-trimester bleeding or pregnancy loss?

For abortion or pregnancy loss before 12 weeks, ACOG suggests forgoing routine Rh testing and Rh immune globulin, while SMFM recommends offering them when feasible without delaying care. Bleeding in an ongoing pregnancy requires its own assessment. Discuss the event, gestational age, and your preferences with the obstetric team.

What side effects can occur after a RhoGAM injection?

The current RhoGAM label describes injection-site swelling, firmness, redness, mild pain, or warmth. Rash, body aches, a slight fever, chills, malaise, and back pain have also been reported. Severe hypersensitivity can occur and needs immediate medical care.

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References

  1. The Rh Factor: How It Can Affect Your Pregnancy

    ACOG · https://www.acog.org/womens-health/faqs/the-rh-factor-how-it-can-affect-your-pregnancy

  2. Package Insert - RhoGAM and MICRhoGAM

    FDA · https://www.fda.gov/media/190188/download

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.