Also, Doppler can detect abnormal blood flow within the heart, which can indicate a problem with one or more of the heart's four valves. Color Doppler. Color Doppler is an enhanced form of Doppler echocardiography. With color Doppler, different colors are used to designate the direction of blood flow.
Quick Answer. The age at which people grow armpit hair varies, but for boys it is often between the ages of nine and 14. Girls typically begin to grow this hair between eight and 13 years of age. Keep Learning.
What is the normal age for boys to start to get chest and facial hair? Why do you ask?: A male human can have chest hair and thick beard by age 11-12, or still be getting his in his early 20's, or be one of the 5% of men who never get chest hair.