what are free testosterone levels in healthy men?

What is the ideal range for my free testosterone levels?

The study involved healthy men aged 19 and older without any significant medical issues related to the hypothalamus, pituitary, or testes and with normal physical exams. It excluded individuals with a BMI over 30, any severe or unstable illnesses, elevated liver enzymes, diabetes, or high creatinine levels. Men using hormone-related prescriptions or supplements were also not eligible, although those on stable thyroid or blood pressure medications were allowed.

How to interpret percentiles. The 97.5th percentile for free testosterone with a value of 943 in men aged 40-59 indicates that 97.5% of men in this age group have free testosterone levels below 943 pmol/L, while only 2.5% have levels above this. This percentile position suggests that a free testosterone level of 943 pmol/L is exceptionally high for this demographic.

Number of Participants (N):

• <40 years: 61 participants

• 40–59 years: 30 participants

• ≥60 years: 54 participants

• Overall: 145 participants

1. Percentile Distribution: (units pmol/L)

   • 2.5th Percentile:

     • The <40 age group has a value of 415.

     • The 40–59 age group has the lowest at 191.

     • The ≥60 group has a slightly higher value at 229.

     • Overall: 229.

   • 10th Percentile:

     • The <40 group shows a value of 445.

     • The 40–59 group is 283.

     • The ≥60 group is similar at 286.

     • For all ages: 315.

   • 25th Percentile:

     • The <40 group is 516.

     • The 40–59 group is 437.

     • The ≥60 group is lower at 337.

     • Overall: 403.

   • 50th Percentile (Median):

     • The <40 group has a median value of 657.

     • The 40–59 group is slightly lower at 510.

     • The ≥60 group has the lowest median at 393.

     • Overall: 489.

   • 75th Percentile:

     • The <40 group is 791.

     • The 40–59 group is 611.

     • The ≥60 group is lower at 457.

     • Overall: 657.

   • 90th Percentile:

     • The <40 group is 949.

     • The 40–59 group is 789.

     • The ≥60 group is lower at 516.

     • Overall: 831.

   • 97.5th Percentile:

     • The <40 group has the highest value at 1274.

     • The 40–59 group has 943.

     • The ≥60 group has the lowest value at 641.

     • Overall: 1072.

https://onlinelibrary.wiley.com/doi/10.1111/andr.13310