Cullen sign develops within what timeframe?

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Cullen sign is a delayed indicator of intra-abdominal or retroperitoneal bleeding. It takes time for blood that has leaked to track through tissues and show up as periumbilical ecchymosis, so it doesn’t appear right away. The typical window for this bruising to become visible is about one day to three days after the bleed begins, which corresponds to a timeframe of 24 to 72 hours. That range best captures the usual variability you’ll see in real patients.

In other words, if you’re assessing someone with suspected abdominal bleeding, Cullen sign is a sign that may appear within roughly a day or two and can extend up to about three days. Early timeframes (like 6–12 hours) are unlikely, and narrower windows don’t account for the variability where bruising first shows up around day one and can persist into day three. If you observe it, it points to significant intra-abdominal hemorrhage and necessitates urgent evaluation and management.