What does the kidney and liver spots indicate?
Patient: What do red and blue spots/markers/splotches indicate on a kidney and liver ultra sound?  Is it an ominous sign? I am 35 years old female, 68kgs  with a strong family history of bowel cancer with both my father and grandfather dying from the disease - my father had secondary cancer in his liver. Doctor: Dear patient,you are probably observing color Doppler ultrasound. Blue spots indicate a blood flow that goes away from the probe, while red dots indicates when blood is coming to the probe. This patterns need interpretation, and this is what radiologists does.