reference range

I have two sets of results, which I will post shortly. The E2 is using the same assay, but the total and free are not. Before I present the results, I would like to understand the following: For my free testosterone, both results are using pg/mL. I know that the results won't be the same, and I...

Hello, I had blood work done in May and the reference range for Free T was- 35.0-155.0 pg/mL Just had them done again in October and they changed to - 46.0-224.0 pg/mL Anyone know why they changed this seems like a big jump?

We know some reference ranges on blood test are adjusted for age, but I don’t know which ones are and which aren’t. This is important because it tells us if we are over or under range, creates flags on blood tests, may concern patients or doctors. Recently Dr. X contributed the fact that...