At the KDIGO era, it is surprising the answer we see to question 5. Fifty-seven percent of people consider a serum PTH value > 300 pg/ml as clinical relevant and not a value 9 times higher than the normal upper limit (around 500 pg/ml) as recommended by the KDIGO. The results also suggest that most physicians are still applying the K-DOQI ranges of 150-300 pg/ml for serum PTH levels.
One can also ask why 16% of participants waited until the PTH values is > 600 pg/ml to take this biological abnormality as relevant. It must remind that several studies have clearly shown that the higher the basal PTH value the lower chances of an optimal response to vitamin D and calcimimetics therapies. There is also a risk of parathyroid cells autonomization and monoclonal transformation.
Regarding the 10% of participants considering important PTH values greater than 60 and 120 pg/ml, this is probably excessive.