About 5%.
QUOTE
To explore the issue, researchers combined data from three past studies to generate a sample pool of about 3,000 medical records. Their analysis found a misdiagnoses rate of just over 5 percent, which when extrapolated to the 80 percent of U.S. adults that receive outpatient care every year, comes to 12 million people.
--------------
Diogenes of Sinope:
"It is not that I am mad, it is only that my head is different from yours."
"Other dogs bite only their enemies, whereas I bite also my friends in order to save them."
Arnold Judas Rimmer, BSC, SSC:
"Better dead than smeg."