Is testosterone level - 4,3 ng/ml (ref. 2,5 10,3) concidered average or low? i'm 28 years old. what t level at this age should have a healthy man?

Whats normal: As you can see the normal range for testosterone is quite broad. Typically T levels are highest at 8am in the morning and that is the proper time for it to be checked. This is due to normal hormonal circadian rhythm. As long as the T level is within the normal range it is typically normal. Symptoms consistent with low t level include decreased sex drive, decreased morning erections and ED.