Does a 280 testosterone level in a 30 yr old male constitute testosterone replacement therapy?

Random level low. The level you mentioned is low for your age.You need to have it repeated with an am sample of blood and also free testosterone level, before you can be considered for testosterone therapy for life.You may need other tests to find the cause of low testosterone at your age. And other question I have is the reason you were tested for testosterone level at age of 30. If doubt consult an endocrinologis.
Usually not. What is the normal level for the lab? Were you taking testosterone at the time of the lab? Testosterone is secreted more in the am and episodically with decreases later in the day.