Sample Matrix is an important determinant of the Stability of
Intact Parathyroid Hormone. A Price and M Loxley. Clin Chem Enzym Comma 1997(7)
277-285.
It took us awail to publish but we have been
using plasma as the matirx of choice since 1993. While there are variations
between methods we have found Heparin to be more suitable than EDTA because the
latter can cause under-recovery and non-linearity. We specify Heparin samples
for PTH analysis and store at 4oC for up to 7 days, samples are frozen for
longer storage.
Alun Price
Clinical Chemistry
Northern General Hospital
Herries Road
Sheffield
01142715321