Rh0(D) and Du cord blood typing during elective abortion operations

Area of Science:

• Maternal-fetal medicine
• Immunology
• Obstetrics

Background:

• Rh alloimmunization is a significant concern in pregnancy.
• Accurate Rh typing of the fetus is crucial for managing Rh-negative mothers.
• Current methods for fetal Rh determination can be invasive or limited in early pregnancy.

Purpose of the Study:

• To assess the feasibility of obtaining fetal blood samples from the umbilical cord during abortion procedures.
• To determine the earliest gestational age for successful fetal blood sampling for Rh typing.
• To evaluate the utility of this method in identifying Rh-negative fetuses to guide prophylaxis decisions.

Main Methods:

• Umbilical cord blood sampling during dilatation and suction or evacuation procedures.
• Rh typing (Rho(D) and Du factors) of collected fetal blood samples.
• Correlation of successful sampling with gestational age.

Main Results:

• Successful fetal blood sampling for Rh typing was achieved in approximately 30% of cases at 14 menstrual weeks.
• Sampling success increased to over 75% by 16 menstrual weeks.
• Among cases where Rh typing was successful, about 40% of fetuses from Rh-negative mothers were also Rh-negative.

Conclusions:

• Umbilical cord blood sampling during abortion procedures is a viable method for fetal Rh typing.
• This technique becomes highly successful by 16 menstrual weeks.
• Identifying Rh-negative fetuses can prevent unnecessary anti-Rho(D) immunoglobulin administration in Rh-negative mothers.