Why this sequence matters
Clinical and operational context
In the clinic: Trigger timing locks in the 35-to-36-hour biological window before oocyte retrieval. When a late afternoon estradiol result shifts the trigger time on the weekend of a daylight-saving clock change, both the patient and the procedure teams need the exact revised minute and true elapsed interval.
Across handoffs: Afternoon nursing runs are high-interruption environments: multiple charts are open, satellite labs trickle in, and evening callbacks cross from daytime coordinators to on-call staff. Each safeguard in this walkthrough holds a specific failure mode without taking clinical judgment away from the nurse or physician.