If you show up to the Hospital of the University of Pennsylvania's emergency room but aren't in serious trouble, get ready to wait. New federal data show that the prestigious university hospital has the highest median ER wait times in the city at 81 minutes to see a doctor. The Centers for Medicare and Medicaid Services, which publish the data from hospital submissions, say long waits can be a sign of understaffing or gridlock elsewhere in the hospital. And they can lead to lower quality care and more stressful stays for patients and families.