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Diagnostic Tests: Prenatal Screening
Routine Prenatal Screening Tests
Basic prenatal screening is recommended for all pregnancies to assess maternal health, identify infectious risks, and evaluate fetal development. These tests are part of standard obstetric care and are not dependent on maternal age or risk status. Routine prenatal screening includes cervical cytology, a complete blood count (CBC), and urinalysis to detect anemia, infection, or renal abnormalities. Maternal blood testing also includes blood group, Rh factor, and antibody screening to prevent hemolytic disease of the newborn, along with serologic testing for syphilis and assessment of rubella immunity.
Additional routine evaluations include glucose screening for gestational diabetes and fetal ultrasound for pregnancy dating, growth monitoring, and anatomic assessment. Cervical cultures are obtained to screen for Neisseria gonorrhoeae, Chlamydia trachomatis, and Group B Streptococcus, which are important causes of maternal and neonatal infection.
High-Risk Pregnancies and Mothers Over Age 35
In high-risk pregnancies, particularly in women 35 years of age or older, additional testing is required because of the increased risk of chromosomal abnormalities. In these cases, the appropriate diagnostic approach is chromosomal screening for fetal abnormalities.
On exams, when the clinical stem emphasizes advanced maternal age or otherwise labels the pregnancy as high risk, the correct answer is chromosomal screening, rather than repeating routine prenatal laboratory tests.
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Routine Prenatal Screening Tests
Basic prenatal screening is recommended for all pregnancies to assess maternal health, identify infectious risks, and evaluate fetal development. These tests are part of standard obstetric care and are not dependent on maternal age or risk status. Routine prenatal screening includes cervical cytology, a complete blood count (CBC), and urinalysis to detect anemia, infection, or renal abnormalities. Maternal blood testing also includes blood group, Rh factor, and antibody screening to prevent hemolytic disease of the newborn, along with serologic testing for syphilis and assessment of rubella immunity.
Additional routine evaluations include glucose screening for gestational diabetes and fetal ultrasound for pregnancy dating, growth monitoring, and anatomic assessment. Cervical cultures are obtained to screen for Neisseria gonorrhoeae, Chlamydia trachomatis, and Group B Streptococcus, which are important causes of maternal and neonatal infection.
High-Risk Pregnancies and Mothers Over Age 35
In high-risk pregnancies, particularly in women 35 years of age or older, additional testing is required because of the increased risk of chromosomal abnormalities. In these cases, the appropriate diagnostic approach is chromosomal screening for fetal abnormalities.
On exams, when the clinical stem emphasizes advanced maternal age or otherwise labels the pregnancy as high risk, the correct answer is chromosomal screening, rather than repeating routine prenatal laboratory tests.
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