Absolutely. Reference ranges are set using normal studies, usually using a book like Molecular Chemistry Tietz, or a reference book in other areas of the lab for hematology, blood banking AABB manual.
Then using those resources the lab will draw blood on 120 local patients and perform a normal study to set their reference ranges using 68% of the ranges 1 SD of the mean and then 2 SD within 95% of the mean either higher or lower.
While this is a valid way of determining normal ranges, it obviously wouldn't include men/women using AAS. A 20g/dl hemoglobin is something very few people would ever experience and it's considered unethical to do those studies.
I can say from experience having had a 22.5g/dl hgb, it's not good for your health at all. Thus the reason not not demonize aas users, but to educate them on the need to regularly drain that blood and stop worrying about Ferritin levels that need to be decreased in a state where aas causes increased iron absorption to begin with.
Body builders should get regular blood donation on schedule, it should be something we do regularly every 2 to 4 months as it is proven very healthy for normal populations and even more healthy I would suspect for aas users.
Download Tietz Molecular Chemistry for free to see how labs establish reference ranges:
Tietz Molecular Chemistry
Henry's Lab Methods is also an excellent resource for free:
Henry's Lab Manual