A pregnant client at 28 weeks gestation with gestational diabetes mellitus (GDM) comes to the clinic for a routine prenatal visit. Which assessment finding would be most concerning and require immediate intervention?

When a client at 28 weeks gestation with GDM reports no fetal movement for 6 hours, immediate action is required. The priority is to confirm fetal well-being. Do not delay evaluation to adjust diabetic management or perform routine prenatal checks. Begin with a non-stress test (NST) to assess fetal heart rate reactivity and variability. If the NST is non-reactive, a biophysical profile (BPS) or contraction stress test (CST) should follow to comprehensively evaluate fetal status.

• Metabolic Control: A postprandial glucose of 140 mg/dL is above the typical target of <120-130 mg/dL but represents a need for therapy adjustment (diet, exercise, or insulin), not an obstetric emergency.
• Weight Gain: A gain of 1 lb per week in the second and third trimesters is expected and reflects appropriate nutritional intake and fluid volume.
• Fundal Height: A measurement of 26 cm at 28 weeks is within the clinically acceptable variance of +/- 2 cm and does not independently signal acute fetal danger.

Instruct the client to perform daily fetal movement counts starting at 28 weeks. She should lie on her left side and count movements at the same time each day. A healthy fetus typically moves at least 10 times in 2 hours. Any report of fewer than 10 movements in 2 hours, or a significant and sustained decrease from the baseline pattern, requires immediate presentation to the labor and delivery unit for evaluation, not waiting for the next scheduled appointment.