Can OCD be often overlooked by misdiagnoses?

[Ravenfreak]

Sometimes the line between OCD and Autism can be hard to determine. These two disabilities might present with similar symptoms and those who might actually have OCD might get diagnosed with Autism. Do you know someone who was diagnosed with Autism then diagnosed with OCD instead later on in life? Is there a way to prevent this from happening or are the lines between OCD and other illnesses too close?