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Calculated free testosterone in men

I know that this periodically crops up but….

We are about to go live with a calculated free testosterone in men and would be grateful for any advice on the best calculation and reference range,  using current immunoassay methods. 

We are considering the Nanji and wheeler but this was originally derived for women and did not use a gold standard method.

We are also considering the Vermeulen equation.

Any views?

martin


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