What are the normal warning indicators of male hormone health risks?

The current normal clinical reference value for adult male serum total testosterone is 9.9~31.8nmol/L. Below 8nmol/L is basically a high-risk range for testosterone deficiency. Men over 40 years old should also refer to the free testosterone index. The normal reference value is 0.21~0.62nmol/L. If it is below 0.18nmol/L, you should be alert to related health risks.

Of course, the reference intervals of different testing methods and different institutions will be slightly different. Some hospitals that use the chemiluminescence method will set the normal lower limit of total testosterone to 11nmol/L. There are also European and American geriatric disease guidelines that relax the total testosterone warning value for men over 60 years old to 7nmol/L. Currently, there is no completely unified stratification standard in the industry.

Last week, I met a 32-year-old Internet programmer at the outpatient clinic. He said that he has been feeling tired for the past six months. He slumped when he got home from get off work. His hairline fell faster than before, and he was not even interested in married life. He thought it was because he stayed up too late. His fasting blood test showed that the total testosterone was only 7.2nmol/L, which is already lower than the universal warning value. It is a typical early-onset testosterone deficiency. If it continues, it may even affect fertility.

Don't think that everything will be fine if the value is stuck in the reference line. This indicator is actually a bit like a car's oil gauge. It does not mean that it has to fall to the red line and the light comes on to be called a lack of oil. If you have irregular work and rest, and have to work overtime for a long time, even if your total testosterone has just crossed the qualified line of 10nmol/L, you have already begun to experience fatigue, emotional irritability, and decreased erectile function. This is also a sub-health state that requires intervention.

Now many scholars in the field of endocrinology have proposed that the same reference threshold should not be set for men of all ages. It is also recommended to set early warning lines by age: 18 to 30 years old is less than 12 nmol/L as high risk, 30 to 50 years old is less than 10 nmol/L, and 50 years and older is less than 8 nmol/L. This stratified standard is more in line with the hormone secretion patterns of different ages, but it has not been widely used in clinical practice. Routine physical examinations still use universal reference values.

By the way, the time to measure testosterone is also particular. Blood must be drawn between 8 and 10 a.m. on an empty stomach to be accurate. After all, testosterone secretion has a circadian rhythm, and the value in the afternoon will be about 30% lower than in the morning. There used to be a 25-year-old guy who stayed up late playing games until three o'clock the day before. He went to check his hormones on a whim the next afternoon. The total testosterone was only 6.5nmol/L. He was so scared that he didn't sleep well for half a month. After adjusting his schedule as required, he retested twice. The results were both above 13nmol/L. It was a false alarm.

If you are really unsure after getting the report, don't make blind guesses at the online indicators. Just find an andrology or endocrinology doctor to make a comprehensive judgment based on your symptoms and living habits. Don't scare yourself.