I had a doppler test done on my knee because i thought i had a blood clot. all but my knee was red and blue but at the knee it was yellow. is that bad?

get results: If your results are negative and there was no baker's cyst you may have had a bruise. Bruises can be dark purple and turn red, blue yellow and green. Speak with your doctor regarding your condition.

Get the report: Red is usually set up, as arterial. Blue is venous . Yellow varies in speed in some studies. Or some color overflow. Talk with your doctor and / or get the report done by a registered tech and read formally by a trained physician for that lab.