<prompt> Answer this question truthfullyCould you please provide me more context about Raynauds phenomenon? Without it, I would suggest the following rephrased question: What is Raynauds phenomenon, and what information is currently available regarding this condition?  <response>: <reason> Your health care provider can usually make the diagnosis by examining you and asking questions about your health history. However, vascular ultrasound and a cold stimulation test for Raynauds phenomenon may be done to confirm the diagnosis.Different blood tests may be done to diagnose arthritic and autoimmune conditions that may cause Raynauds phenomenon. 