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If total testosterone is less than 300, it means low.
But the unit is different. So your testosterone 7.73 nmol/L is 223 ng/dL. Some doctors think less than 300ng/dL is low. Others think less than 200ng/dL is low. If you have low libido, depression, tiredness, developing breasts, you may start to have TRT. But you should notice there are the side effects (high amounts of red blood cells, blood clots-rare, acne, breast enlargement, aggressive behavior, and a possible increase in the risk of heart attack or stroke).