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.
Reviewed by Brunilda Nazario, MD. Oct. 20, 2012 -- American boys are starting puberty up to two years earlier than decades ago, new data show. Boys are entering puberty at an average age of 10 among whites and Hispanics, and at an average age of 9 among African-Americans.About a third of boys start to mature sexually up to two years earlier than average.hose who start puberty soonest aren't always the first to finish. In the Herman-Giddens study, the average age of full sexual maturity for boys of all races and ethnicities was about the same -- late in the 15th year. About a third of these boys reached full maturity two years sooner.