In recent times we have been seeing requests for PTH levels in
normocalcaemic patients, probably as part of an "osteoporosis" or
"osteoporosis risk" investigation. We have seen a number of patients with
elevated PTH levels (Immulite intact PTH assay) and normal serum calcium.
PTH can be more than twice the upper RR limit. Most patients are
otherwise apparently healthy and the most recent had normal 24 hour urinary
calcium excretion. We checked vitamin D status in one patient despite
normal serum ALP and found 25-OH D to be unremarkable.
I would be grateful for any thoughts as to what is going on here.
Bruce Campbell
************************************
Bruce Campbell FRCPA, FAACB
Chemical Pathologist
Sullivan Nicolaides Pathology
PO Box 344 Indooroopilly Qld 4068 Australia
ph 61 (0)7 3377 8672
fax 61 (0)7 3870 5989
email [log in to unmask]
*************************************
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|