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.
Average Age Of Growth Spurts In Boys. The average age at which puberty begins in boys is 11 to 12 years. The end of puberty is not clearly delineated and may vary with the physical, emotional, mental, social and cultural criteria to define an adult boy. However, it usually gets complete at around the age of 17 to 18.