Human Chromogranin A ELISA Kit
This ELISA (enzyme-linked immunosorbent assay) kit is intended for the quantitative measurement of human chromogranin A levels in EDTA-plasma and serum samples. This assay exclusively measures human chromogranin A without the high dose "hook" effect up to 1,000,000 ng/ml. This test may be used as an aid for detecting pheochromocytoma and neuroendocrine tumors in patients.
This chromogranin A ELISA kit is for in-vitro diagnostic use.
Chromogranin A is a 49 kDa acidic protein that consists of 439 amino acids encoded on chromosome 14. Chromogranin A has been identified in a number of normal and neoplastic endocrine tissues. It is demonstrated that an elevated level of circulating chromogranin A is a marker for tumors of neuroendocrine origin. However, the most significant clinical use of chromogranin A is related to the diagnostic procedure in patients with pheochromocytoma. The following is a short summary of the potential usages of chromogranin A.
1. A very sensitive (83%) and highly specific (96%) marker in the evaluation of actual or suspected pheochromocytoma. Drugs commonly employed in the diagnosis or treatment of pheochromocytoma have little effect on plasma chromogranin A levels, which is a great advantage over the measurement of catecholamines.
2. To ascertain the source of a tumor. A high chromogranin A level indicates that the tumor arises from neuroendocrine tissues.
3. Endocrine tumors that do that produce their specific hormones, for example, calcitonin negative but chromogranin A positive C-cell carcinoma; zero-cell carcinoma; beta-cell carcinoma; parathyroid carcinoma.
Tests Per Kit
Sensitivity / LLOD
Total Incubation Time
Chromogranin A (CHGA, CgA)
2 ng /mL
0 - 660 ng/mL
2 hour, 20 minutes
For in-vitro diagnostic use.