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Ultrasound/Imaging

Poster Session 2

(381) Comprehensive Detailed Anatomic Ultrasound: Allotted Time of 30- vs 45-Minutes

Tuesday, February 13, 2024
3:30 PM – 5:00 PM  
Location: Prince George's Exhibit Hall CDE, Lower Atrium Level
Objective: The p</span>urpose was to ascertain how often Registered Diagnostic Medical Sonographers (RDMS) complete a comprehensive detailed anatomy ultrasound (Current Procedural Terminology [CPT] code 76811) when allotted 30 vs 45 minutes to perform it.

Study Design: We conducted a retrospective cohort study within our MFM Ultrasound Clinics. Cohorts were singletons who had a CPT 76811 performed by a RDMS at 18-24 weeks. We excluded pregnancies with major congenital anomalies and multiples. The CPT 76811 ultrasound study was considered to be complete when all items suggested by the AIUM Detailed Second Trimester OB Checklist were visualized. Based on a baseline rate of 45% of comprehensive detailed anatomy ultrasounds that were completed in our clinics in 30 minutes, to detect a relative increase of 30% (45% to 58%; alpha error=5%; 80% power), 430 women (215 in each group) were required to demonstrate a clinically significant improvement in our primary outcome. Thus, the two cohort groups were: 215 consecutive CPT 76811 performed in July 2022, when RDMS were allocated 30 minutes, and 215 consecutive CPT 76811 performed in January 2023, when RDMS were given 45 minutes. 

Results: Of the 215 anatomy ultrasounds performed in each group, 117 (54%) were completed when RDMS were allocated 30 minutes compared to 173 (80%) when they were given 45 minutes (p < 0.001). Additionally, the number of times the patient had to return to complete the anatomy ultrasound was significantly more when RDMS were given 30 minutes compared to when they were allocated 45 minutes (p=0.005).  There was no statistical difference in maternal age, race, BMI, number of prior cesarean delivery, or co- morbidities between the two groups. There was a difference in gestational age and nulliparity between the two groups. (Table 1) 

Conclusion: RDMS were significantly more likely to complete a comprehensive detailed anatomy ultrasound using the AIUM checklist when allocated 45 minutes vs 30 minutes to perform it.  Our findings provide guidance to clinicians and their practices in terms of logistics in schedule planning, billing, and allotment of resources.