Is 13 mmol/L a low or normal testosterone level?

Patient: Hi. I had been experiencing symptoms of low testosterone so I asked my doctor to test for this. The blood test came back 13 mmol/L or 234 mg/dl. He told me this was in the middle of the normal range, however according to my research the normal range is 300-1000 mg/dl. I’m confused. Is my doctor wrong?

Symptoms: Low mood, low libido, erectile dysfunction.