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.
(I got armpit hair around 11 1/2 but everyone is different) From around age 13-16 but it can still happen earlier or later (maybe even 12 and 19) got mine just before i turned 14. Brent Lyday.
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.