Final answer:
Pregnant women at 24 to 28 weeks' gestation should be screened for gestational diabetes mellitus.
Step-by-step explanation:
The patients who should be screened for gestational diabetes mellitus are d. Pregnant women at 24 to 28 weeks' gestation. Gestational diabetes mellitus (GDM) is a type of diabetes that occurs during pregnancy and can lead to complications for both the mother and the baby. Screening for GDM is typically done between 24 to 28 weeks' gestation to identify any abnormalities in blood glucose levels.