# Free T Unit Conversion Check

Hey folks,

I got my blood work done and my free testosterone was 24.76 pg/mL (the reference ranges given by the lab were 4.5 - 42 pg/mL).

I asked the lab if the units they gave me result in were correct and they confirmed that they were. I also asked them what test they used and it was the ELISA (http://www.rapidtest.com/index.php?i=Steroid-ELISA-kits&id=69&cat=14).

I wanted to convert the result to ng/dL and according to this site:

24.76 pg/mL is equal to 2476 ng/dL.

I don’t understand how that can be right.

1 pg = 0.001 ng

So that gives 0.02476 ng/mL.

1 mL = 0.01 dL

So that comes to 2.476 ng/dL.

Can someone please explain where I’m going wrong?

There seems to be a lot of problems with different labs having different ranges. Labcorp and Quest are good examples.

Your labs indicate that you have mid range FT.

Also note that the lab ranges are age adjusted.

I understand that, but I still don’t get how 24.76 pg/mL converts to 2476 ng/dL.

I am not going to play with the math.