Getting Blood Work Done

[Scrub]

I have a question about blood work. I am going to get my blood work done on monday and was wondering if anyone knew the difference between free and total testosterone? If so do you know how sexual activity before the test will effect them? I was told not to have sex a day before the test. Any help would be appreciated. Thanks for your time.

[busster]

i went for a testosterone blood test this week myself.. i called the clinic the day before to see if there were anything not to do, eat drink sex ..etc.. they said no ???

jim

[Scrub]

Any suggestions? Anybody else get this done?

[stupidhippo]

Serum free testosterone is what is available to tissues to be utilized. It's amount is about 2 % from the total concentration, the rest is bound mostly to SHBG (sex-hormone-binding-globulin). The amount of free testosterone is what has the most diagnostic value... I think....pretty sure... 2 lazy 2 check