Total / free testosterone conversion ng / dL - nmol / L

See also: LDL cholesterol calculation

Online calculator

Serum testosterone values ​​(testosteronemia) are expressed in nanograms per deciliter (ng / dL) or in nanomoles per liter (nmol / L); this last unit of measurement is the one adopted by the SI and as such represents the reference standard at the international level.

To help you express the plasma testosterone values ​​in the two different units of measurement, we have prepared a simple calculation form.

Enter the value of:

Testosterone

ng / dL nmol / L nmol / L ng / dL

Normal Values ​​Testosterone

Men Age Testosterone values 7-9 years <9 ng / dL 10-11 years 2-57 ng / dL 12-13 years 7-747 ng / dL 14-15 years 33-585 ng / d 16-17 years 185-886 ng / dL 18-39 years 300-1080 ng / dL 40-59 years 350-890 ng / dL > 60 years 300-720 ng / dL Women Age Testosterone values 7-9 years <15 ng / dL 10-11 years 2-42 ng / dL 12-13 years 6-64 ng / dL 14-15 years 9-49 ng / dL 16-17 years 8-63 ng / dL 18-30 years 11-59 ng / dL 31-40 years 11-56 ng / dL 41-51 years 9-55 ng / dL Postmenopause 6-25 ng / dL

Calculation of free testosterone

The following form determines the share of free testosterone and bioavailable testosterone, making the calculation on the basis of the serum concentration of total testosterone and its transport proteins. Being a water insoluble hormone, in fact, testosterone must necessarily be associated with specific proteins, such as SHBG - sex hormone-binding globulin - or non-specific, such as albumin. The bond with this last molecule (which represents the most abundant protein in plasma) - as opposed to that with SHBG - is however rather labile.

The amount of free testosterone represents the active hormonal fraction, because it is separated from the transport proteins and ready to enter the cells where it carries out its action; the share of testosterone linked to SHBG instead represents a sort of reserve, temporarily inactive; finally, the fraction associated with albumin, by virtue of the weakness of the bond that unites them, is considered bioavailable (like the free one). In addition to the two classic values ​​(total share and free share), it is therefore possible to calculate a further fraction , that of bioavailable testosterone, adding to the free fraction that bound to albumin.

Credits: This calculator was developed at the Hormonology department, University Hospital of Ghent, Belgium.

Albumin g / dL g / L SHBG nmol / L Testosterone ng / dL ng / mL nmol / dL nmol / mL nmol / L

Free testosterone Bioavailable Testosterone

• Plasma albumin levels are normally between 3.5 and 5.5 g / dL (35-55 g / Liter)
• Reference plasma levels for SHBG (may vary by laboratory):

Age Men Women 7-9 years 28-190 nmol / L 35-170 nmol / L 10-12 years 23-160 nmol / L 17-155 nmol / L 13-15 years 13-140 nmol / L 11-120 nmol / L 16-17 years 10-60 nmol / L 19-145 nmol / L > 18 years old 11-80 nmol / L 30-135 nmol / L
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