Guidelines on Rh screening have been updated.

According to the SOGC’s Guideline on Prevention of RhD Alloimmunization published in 2024, for non-sensitized Rh D-negative individuals who have experienced threatened, spontaneous or induced abortion after 12 weeks gestation, administration of 300 μg of Rho(D) immune globulin is suggested.

Prior to that, in 2022, the [Society of Family Planning](SFP1) and the [World Health Organization](WHO1) also recommends withholding Rh testing and administration prior to 12 weeks gestation for patients undergoing MA, spontaneous abortion or uterine aspiration abortion[8,20].