Free testosterone and total testosterone correlation

[Hyperfluxe]

Hey Jordan, is a blood test for free test needed if total test is adequate? Doctors in Canada usually only test for total testosterone and if that's low then they investigate further with free test. My total test is 28.9nmol/L, so can I safely rule out low testosterone as a source of fatigue? Thanks and merry Christmas!

[Jordan Feigenbaum]

Hey Jordan, is a blood test for free test needed if total test is adequate? Doctors in Canada usually only test for total testosterone and if that's low then they investigate further with free test. My total test is 28.9nmol/L, so can I safely rule out low testosterone as a source of fatigue? Thanks and merry Christmas!

If you have a normal free or total testosterone, it'd be very hard to suggest you have symptoms of low testosterone since you don't have low testosterone. Whether or not that is the source of your fatigue is less clear, but given your previous inquiries, I'd doubt it you know?

[Hyperfluxe]

If you have a normal free or total testosterone, it'd be very hard to suggest you have symptoms of low testosterone since you don't have low testosterone. Whether or not that is the source of your fatigue is less clear, but given your previous inquiries, I'd doubt it you know?

So total and free testosterone are linearly correlated? But yeah, I doubt it too. Seeing an endo in 18 days and got booked in for a full in-lab sleep study (few months from now).

[Jordan Feigenbaum]

So total and free testosterone are linearly correlated? But yeah, I doubt it too. Seeing an endo in 18 days and got booked in for a full in-lab sleep study (few months from now).

Not always, but if one is of normal level then having "low testosterone" may not be the issue.