Is there any condition in which we have to give anti D injection in rh negative mother
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Here is a comprehensive overview of all indications for Anti-D (Rh immunoglobulin / RhIG) injection in an Rh-negative mother:
Anti-D (RhIG) Indications in an Rh-Negative Mother
The goal of Anti-D is prophylaxis against alloimmunization — preventing the Rh-negative mother from forming anti-D antibodies that could attack an Rh-positive fetus in a future pregnancy.
Prerequisite: The mother must be Rh-negative AND must not already have anti-D antibodies. If she is already alloimmunized (anti-D present), RhIG offers no benefit and is not given.
Routine Antenatal Prophylaxis
| Timing | Dose |
|---|---|
| 28 weeks gestation (standard antenatal dose) | 300 μg IM |
| If undelivered by 40 weeks, some experts recommend a second dose | 300 μg |
Without RhIG at 28 weeks + delivery, the risk of developing anti-D is ~16%. With prophylaxis, this drops to ~0.1%.
After Delivery
- Rh-negative mother who delivers an Rh-positive baby → give 300 μg within 72 hours of delivery
- If baby is Rh-negative, RhIG is not needed
- If large feto-maternal hemorrhage is suspected (e.g., placental abruption), a Kleihauer-Betke test is done to calculate additional doses (1 vial per 30 mL whole blood or 15 mL packed RBCs of fetal blood)
Sensitizing Events During Pregnancy (Any Trimester)
Anti-D must be given after any event that may cause feto-maternal hemorrhage:
| Sensitizing Event | Notes |
|---|---|
| Spontaneous abortion / miscarriage | Even threatened miscarriage; 50 μg mini-dose if <12 weeks |
| Induced / elective abortion | 50 μg if <12 weeks; 300 μg if ≥12 weeks |
| Ectopic pregnancy | Give RhIG after surgical or medical management |
| Amniocentesis | Both early and late; full dose (300 μg) |
| Chorionic villus sampling (CVS) | Full dose |
| External cephalic version (ECV) | Full dose |
| Abdominal trauma (blunt) | Even if no confirmed hemorrhage |
| Fetal death (2nd or 3rd trimester) | Full dose |
| Hydatidiform mole | Full dose |
| Antepartum hemorrhage | Any episode of APH |
For events before 12 weeks: a mini-dose of 50 μg is sufficient (as fetal red cell volume is small), but if unavailable, the standard 300 μg can be used. — Creasy & Resnik's Maternal-Fetal Medicine
Non-Obstetric Indications
- Accidental transfusion of Rh-positive blood to an Rh-negative woman → RhIG given after RBC exchange transfusion (1 vial per 30 mL whole blood transfused)
- Transfusion of Rh-positive platelets to an Rh-negative woman
Special Cases
- Partial D phenotype women: should receive RhIG at the same intervals and doses as Rh-negative women (they remain at risk for D alloimmunization)
- Rh-negative women with anti-G antibodies: RhIG is still recommended, because these women remain at risk of developing true anti-D antibodies
Who Does NOT Get RhIG
- Women who are Rh-positive
- Women who already have anti-D antibodies (alloimmunized) — no benefit
- Women with weak D types 1, 2, or 3 — not at risk for alloimmunization
Sources: Henry's Clinical Diagnosis and Management by Laboratory Methods | Creasy & Resnik's Maternal-Fetal Medicine | Quick Compendium of Clinical Pathology, 5th ed. | Rosen's Emergency Medicine
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