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The Human Normetanephrine ELISA Kit is a sophisticated in vitro diagnostic tool designed for the precise quantification of normetanephrine in human plasma, serum, and urine samples. Utilizing a competitive enzyme-linked immunosorbent assay (ELISA) format, this kit provides clinicians and researchers with a reliable method for the screening and diagnosis of pheochromocytoma and other catecholamine-secreting tumors. With its optimized protocol and ready-to-use components, the kit delivers exceptional sensitivity and reproducibility, making it an essential asset for clinical laboratories, endocrinology departments, and research institutions specializing in neuroendocrine tumor evaluation.
Normetanephrine is a major metabolite of norepinephrine, produced through the action of catechol-O-methyltransferase (COMT). The measurement of normetanephrine has become the gold standard in biochemical testing for these tumors due to its superior sensitivity compared to traditional catecholamine measurements. The clinical significance of normetanephrine quantification extends beyond initial diagnosis to include preoperative assessment, postoperative monitoring, and screening of high-risk populations, including patients with hereditary syndromes such as multiple endocrine neoplasia type 2 (MEN2), von Hippel-Lindau disease, and neurofibromatosis type 1. The stability of normetanephrine in plasma and urine makes it particularly valuable for clinical testing, as it reflects sustained catecholamine production rather than episodic secretion.
Figure 1. Norepinephrine metabolic pathway.
This ELISA kit employs a competitive binding principle that ensures accurate detection of normetanephrine across clinically relevant concentrations. The assay utilizes a microtiter plate coated with a normetanephrine analog, which competes with the normetanephrine in patient samples for binding to a limited amount of specific antibody. The robust design minimizes interference from related catecholamine metabolites while maintaining high analytical specificity, providing reliable results for clinical decision-making. This design overcomes limitations of traditional methods (e.g., radioimmunoassay's radioactive risks, liquid chromatography's high instrument cost) and enables efficient, cost-effective T3 quantification.
Sample Compatibility
Sensitivity Range
Main Uses
Feature/Specification
Intended Use & Research Applications
| Parameter | Details |
| Product name | Human Normetanephrine ELISA Kit |
| Sample | serum |
| Intended Use | Enzyme immunoassay for the manual and automated measurement of normetanephrine in human urine. |
| Storage | Store components of the kit at 2-8°C or -20°C upon arrival up to the expiration date. For more detailed information, please download the following document on our website. |
The assay demonstrates minimal cross-reactivity with metanephrine, norepinephrine, epinephrine, and other catecholamine-metabolites, ensuring accurate normetanephrine quantification without interference from structurally similar compounds. This high specificity is crucial for reliable tumor detection and monitoring, particularly in cases where multiple catecholamine metabolites may be elevated. The robust assay performance remains consistent across different sample matrices, including plasma, serum, and urine.
Rapid Assay Protocol
Total assay time < 2 hours—shorter than most commercial T3 ELISA kits (3–4 hours)—enabling high-throughput testing for large-scale studies (e.g., screening 50+ clinical samples per day).
Exceptional Specificity
The monoclonal anti-T3 antibody targets the unique iodinated phenol ring of T3, eliminating cross-reactivity with T4 (a major confounding factor in T3 detection) and ensuring accurate quantification of only active T3.
Broad Compatibility
Validated for both serum and EDTA/Heparin plasma—common sample types in clinical endocrine research—avoiding the need for sample type-specific kits.
The Human Triiodothyronine (T3) ELISA Kit is an essential tool for thyroid function research. Its ultra-sensitivity, high specificity, and clinical sample optimization enable accurate T3 quantification in diverse biological matrices, supporting studies on thyroid disorders, endocrine homeostasis, and chronic disease-related thyroid dysfunction. Compared to alternative methods and competing kits, it offers superior safety, accessibility, and consistency—addressing key pain points in T3 research. With strict quality control and comprehensive technical support, this kit empowers researchers to advance understanding of thyroid physiology and develop innovative therapies for thyroid-related diseases. Whether for academic laboratories, pharmaceutical R&D teams, or clinical research centers, it is a reliable choice to drive impactful endocrine research.
A1: Normetanephrine measurement has become the biochemical test of choice for pheochromocytoma diagnosis due to its superior sensitivity (approaching 99%) compared to traditional catecholamine measurements. The metabolite's stability in circulation provides a more reliable indicator of catecholamine production than the parent compounds, which are subject to rapid fluctuation and degradation.
ed sample preparation protocols are provided in the kit insert, with specific instructions optimized for each sample matrix.
A2: While LC-MS/MS is considered the reference method, this ELISA provides a cost-effective alternative with comparable clinical performance for most diagnostic applications. The ELISA format offers advantages in terms of equipment requirements, technical expertise needed, and throughput capacity, making it particularly suitable for laboratories without access to mass spectrometry facilities.
A3: Moderately elevated normetanephrine levels may occur in various conditions including congestive heart failure, renal insufficiency, metabolic syndrome, and during treatment with certain medications (particularly tricyclic antidepressants and MAO inhibitors). Stress and vigorous exercise can also cause transient elevations. These factors must be considered when interpreting results.
A4: We recommend running two levels of quality control materials with each assay batch. Participation in external quality assurance programs is advised for laboratories performing clinical testing. Regular calibration verification, reagent tracking, and equipment maintenance are essential for maintaining optimal assay performance. The kit includes detailed instructions for establishing laboratory-specific reference ranges.
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