When a Rh-negative female delivers a Rh-positive baby, she should receive anti-D gamma globulin within?

BSF Staff Nurse - 2015

Obstetrics & Gynaecology

Easy

Appeared in: BSF Staff Nurse - 2015

Explanation

The standard and most effective window for administering anti-D gamma globulin (RhoGAM) to an Rh-negative mother after the delivery of an Rh-positive baby is within 72 hours.
This timing is critical to neutralize any fetal Rh-positive red blood cells that may have entered the maternal circulation during childbirth.
Administering RhoGAM within this timeframe prevents the mother's immune system from becoming sensitized and producing her own anti-D antibodies, which could harm future Rh-positive fetuses.

Option B: While administering the injection within 48 hours is effective, the established protocol allows for a wider, more practical window of up to 72 hours without any loss of efficacy.
Option C: This is an unnecessarily restrictive timeframe. The 72-hour window is the evidence-based standard of care that allows for logistical considerations like blood typing and pharmacy preparation.
Option D: This is incorrect. While earlier administration is not harmful, there is no clinical requirement for such immediate action. The 72-hour period provides sufficient time for all necessary checks and balances before administration.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Postpartum prophylaxis for Rh incompatibility as background academic context rather than a clinical decision trigger.
Nurses play a crucial role in preventing Rh sensitization by ensuring timely administration of RhoGAM. This includes verifying the mother's Rh-negative status and the baby's Rh-positive status, checking for a negative maternal Indirect Coombs' test (indicating no prior sensitization), and documenting the administration correctly.
Patient education is vital. The nurse must explain to the mother why the injection is necessary to protect her future pregnancies.
What if? If the mother is already sensitized (positive Indirect Coombs' test), RhoGAM is not given because it is ineffective; the mother has already produced her own antibodies. The focus then shifts to monitoring future pregnancies for signs of hemolytic disease of the newborn.

How to Approach the Question

This is a factual recall question based on a standard obstetric protocol.
First, identify the key clinical scenario: an Rh-negative mother and an Rh-positive baby.
Next, identify the intervention: administration of anti-D gamma globulin (RhoGAM).
The question asks for the specific timeframe for this intervention postpartum.
Recall the standard of care for preventing Rh isoimmunization. The established window is within 72 hours of delivery.
Select the option that matches this standard timeframe.

Concept Tested & Keywords

Concept Tested: Postpartum prophylaxis for Rh incompatibility.
Stem keywords: Rh-negative female, Rh-positive baby, anti-D gamma globulin
Lead-in keywords: within
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: false

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 467-469

E6 Obstetrics Williams p. 48-68