<unk>  <unk>  is a precursor of the hormone calcitonin, which is involved with calcium homeostasis, and is produced by the C-cells of the thyroid gland.  It is there that<unk>  is cleaved into calcitonin, katacalcin and a<unk> ein residue.  It is not released into the blood stream of healthy individuals.  With the derangements that a severe infection with an associated systemic response brings, the blood levels of<unk>  may rise to 100 ng/ml.  In blood serum,<unk>  has a half-life of 25 to 30 hours.
The test is commercially available and produced by Thermo Fisher Scientific.
Triggering receptor expressed on myeloid cells-1 (TREM1) may be a more accurate serum biomarker for diagnosing infection.
Comparisons of the<unk>  and c-reactive<unk> ein give conflicting results.
Procalcitonin
Calcitonin 
Creatinine
Amylase
Parathyroid hormone 
Calcitriol 
Gamma-glutamyl transpeptidase
Albumin