Chromogranin a labcorp

Labcorp test details for Vitamin A. Vitamin A is the name given to a group of biologically active, fat-soluble molecules that includes retinol, retinal and retinoic acid. 1,2 These retinoid compounds are derived from the plant precursor molecule, β-carotene. β-carotene (also referred to as provitamin A) has a structure that consists of two molecules of retinal linked at their aldehyde ends ...

Chromogranin a labcorp. When your doctor has ordered some lab work for you, or a new employer requires a drug screen, it is easier than ever to make an appointment online and do so at your convenience on ...

Serotonin, Blood. In conjunction with, or as an alternative to, first-order tests in the differential diagnosis of isolated symptoms suggestive of carcinoid syndrome, in particular flushing (5-hydroxyindoleacetic acid or serum chromogranin A measurements are first-line tests) Second-order test in the follow-up of patients with known or treated ...

C 3 comprises about 70% of the total protein in the complement system and is central to activation of both the classical and alternate pathways. Increased levels are found in numerous inflammatory states as an acute phase response. CH 50 (total complement hemolytic activity), C 3 and/or C 4 may be decreased in cases of systemic lupus ...Chromogranin A is a reliable serum diagnostic biomarker for pancreatic neuroendocrine tumors but not for insulinomas. Xin-Wei Qiao, Ling Qiu, Yuan-Jia Chen, …Germany extends travel ban on non-Europeans until at least the end of August. After months of closed borders due to coronavirus, some countries around the world are starting to ope...Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC; 500918: Pathology Report: 500920. 22633-2: 500918: Pathology Report: 500943Chromogranin A, LC/MS/MS - Chromogranin-A (CgA) is an acidic glycoprotein expressed in the secretory granules of most normal and neoplastic neuroendocrine (NE) cell types, where it is released together with peptide hormones and biogenic amines. Neuroendocrine tumors (NETs) are a form of cancer that differ from other neoplasia in that they synthesize, store, and secrete peptides, e.g., CgA and ...Chromogranin A (CHGA) was identified as a major soluble protein in adrenal medullary chromaffin granules almost 4 decades ago ().Since then it has been found to be a ubiquitous protein stored in dense-core secretory granules of the endocrine, exocrine, and nervous systems, along with their respective hormones, enzymes, and neuropeptides and neurotransmitters.

Test Quick Guide. Chromogranin A (CgA) is a protein released by neuroendocrine cells. Neuroendocrine cells are found in many organs in the body and have characteristics of both nerve cells and cells that make hormones. A test for chromogranin A measures the amount of CgA in the blood.The decline of CHGA expression in the early stages of colon cancer is probably a new diagnostic biomarker for colon cancer diagnosis with high predicting possibility and verification performance. We have also compared the diagnostic powers of CHGA expression with the typical oncogene KRAS, classic tumor suppressor TP53, and well-known cellular ...Labcorp is a leading provider of medical laboratory services, offering a wide range of tests and screenings to help individuals maintain their health and well-being. Labcorp has nu...Chromogranin A is recommended for the detection of specific antigens of interest in normal and neoplastic tissues, as an adjunct to conventional histopathology using non-immunologic histochemical stains. $ 1,123.36. We are currently updating the product codes for a number of our Advanced Staining reagents. From January 2023 you will begin to ...A Chromogranin A koncentrációja korrelál a betegség aktivitásával és a tumor méretével, ezért a vizsgálat a betegség nyomon követésére is használatos, ugyanis CgA érték növekedése a daganatos folyamat progresszióját, a tumor növekedését is jelzi. Elsősorban az elő és utóbélben jelentkező karcinoid tumorok ...

National Office of Quality. Labcorp's National Office of Quality (NOQ) keeps Labcorp at the forefront of clinical and anatomic pathology services by consistently meeting regulatory requirements that help us safely and proficiently serve our patients and their providers. Quality.Chromogranin A (CgA) is a non-specific biomarker excreted by neuroendocrine tumor (NET) cells. Elevation of circulating CgA level can be detected in gastroenteropancreatic (GEP)-NET patients and has been shown to correlate with tumor burden. The prognostic and predictive roles of CgA level and the change of CgA level are controversial.Chromogranin A, Serum. Useful For. Aiding in monitoring disease progression during the course of disease and treatment in patients with gastroenteropancreatic neuroendocrine tumors (GEP-NET grade 1 and grade 2) when used in conjunction with other clinical methods. This test is not indicated for use as a stand-alone monitoring assay. Method Name.Vascular endothelial growth factor (VEGF) is a homodimeric 34 to 45 kilodalton, heparin-binding glycoprotein. VEGF has potent angiogenic, mitogenic and vascular permeability-enhancing activities specific for endothelial cells. 1,2 VEGF expression is regulated by hypoxia, with levels increasing when cells detect an environment low in oxygen. . Physiologically, VEGF induces new blood vessel ...

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Test Preparation Needed? You may be instructed to avoid certain foods and medications prior to this test. (For more details, see the "What is being tested?" section below.) 5-HIAA is a breakdown product of serotonin. The 5-HIAA test measures blood levels to help diagnose and monitors treatment for a carcinoid tumor that produces serotonin.Labcorp - Sign In. Access your Labcorp applications and services with enhanced security and flexibility. Register or use your existing account.Methodology: Chromatography/Mass Spectrometry. Synonyms: CgA, Quest code 31911. CHRMNA. Clinical significance: Chromogranin A (CgA) is used as an adjunct in the diagnosis of carcinoid tumors. Measurements of CgA are also used to assess disease progression, response to therapy, or recurrence after surgical resection.Stains / Test Description. Chromogranin is present in several elements of the diffuse neuroendocrine system (DNES), including anterior pituitary, thyroid perifollicular C cells, parathyroid chief cells, pancreatic islet cells, intestinal enterochromaffin cells and tumors derived from these cells. Chromogranin immunoreactivity was also seen in ...

This antibody is intended to be used after the primary diagnosis of tumor has been made by conventional histopathology using nonimmunologic histochemical stains. Chromogranin A is a protein prohormone with a molecular mass of 48 kDa. The gene encoding the 439 amino acids protein is localized on chromosome 14 (1-3).All Labcorp OnDemand testing requires a physician order; for your convenience, Labcorp OnDemand has contracted with PWNHealth LLC and its affiliated professional entities (collectively, PWNHealth) to provide physician services. Visit a Labcorp location for sample collection; or, if using an at-home kit, collect your sample yourself. ...Chromogranin A immunostain in a paraganglioma. Similar stains. CD56, synaptophysin. Chromogranin A is a common immunostain, and a specific neuroendocinre marker. [1]Labcorp test details for Complement C4a. Activation of the complement system plays an important role in our natural ability to ward off infection and in the pathogenesis of infection and inflammation. 1-6 Anaphylatoxins produced as the result of complement activation play a role in a number of infectious and inflammatory conditions including sepsis, ischemia-reperfusion injury, immune complex ...LabCorp is a healthcare diagnostics company that handles everything from routine labwork to drug testing. This diagnostics service offers ways to schedule, view and manage your app...Labcorp's help center allows you to search frequently asked questions, access contact information and resources to answer your lab questions.Hereditary hemochromatosis (HFE related) is an autosomal recessive iron storage disorder. Patients may have a genetic diagnosis of hereditary hemochromatosis and never show clinical symptoms. Clinical symptoms typically appear between 40 to 60 years in males and after menopause in females. Signs and symptoms may include organ damage, primarily ...Chromogranin A test cost max is in True Health Labs (Sarcoma Panel) with price $539.00. This laboratory test is available in 5 online lab test stores. $168.00. Order. Walk-In Lab. Chromogranin A Serum Test. Covered tests: Chromogranin A ( LabCorp ) Covered components: Chromogranin A. Blacklisted States: NY, NJ, RI.Chromogranin A, the protein that is co-stored and co-released with catecholamines from the adrenal medulla, has recently been identified in a variety of human endocrine tissues, both normal and neoplastic. We investigated the secretion of chromogranin A by peptide hormone-producing human tumors in studies of patients with the following ...

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This review is focused on chromogranin A (CgA), a hydrophilic glycoprotein present in large dense core vesicles of neuroendocrine cells. Despite being long identified as the most useful NEN-related circulating marker, clinical application of CgA is controversial. CgA assays still lack standardization, thus hampering not only clinical management ...Chromogranin A and B; Common Abbreviations: CHRAB CgA, CgB: Profile: NA: Tube type: EDTA : Clinical Indication: Used in the diagnosis and management of patients with neuroendocrine tumours. Specimen Type: Blood: Sample type: EDTA plasma: Minimum Volume: 1mL: Special Precautions: Sample must be sent to the laboratory on ice …Chromogranins, including chromogranin A (CgA), are members of the granin family of neuroendocrine secretory proteins located in the secretory vesicles of neurons and endocrine cells. 3 In addition to the primary function chromogranins in granulogenesis of vesicle formation, CgA is the precursor for many functional peptides …Informatii generale. Informaţii generale – Cromogranina A. Cromogranina A este o proteină cu greutatea moleculară de 49 kD alcătuită din 439 aminoacizi. Face parte din familia graninelor care se găsesc în veziculele secretorii ale celulelor neuroendocrine. Rolul acestora este de a regla activitatea secretorie a acestor celule.Background: Hepatocellular carcinoma (HCC) is the relevant cause of death in patients with compensated cirrhosis. Alpha-fetoprotein (AFP) is used for screening HCC, with limited success. Aim: We evaluated plasma chromogranin A (CgA) as a marker of HCC. Patients: CgA plasma levels and AFP serum levels were prospectively measured in 30 patients with HCC, 14 with cirrhosis, 79 with chronic ...In one study, patients with benign disease had a mean (±SE) chromogranin A level of 188±40.6 ng per milliliter, whereas those with malignant disease had a mean chromogranin A level of 2932±900 ...Clinical Information. Chromogranin A (CgA) is a 439-amino acid protein with a molecular weight of 48 to 60 kDa, depending on glycosylation and phosphorylation status. It is a member of the granin family of proteins and polypeptides. Granins are widespread in endocrine, neuroendocrine, peripheral, and central nervous tissues, where they are ...

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Chromogranin A (CgA) is a prohormone initially extracted from the adrenal medulla, however, increased quantities of CgA are secreted by a wide array of human tissues in the course of a variety of disorders. This protein exhibits a number of interesting endocrine and non-endocrine functions. Here we briefly review the possible involvements of ...Abstract. Background: Chromogranin A (CgA) is a biomarker for neuroendocrine tumors (NETs). The aims of this study were to evaluate differences in measurement between the ThermoFisher Brahms CgA Kryptor assay and the CisBio assay and to investigate the influence of patient covariates. Temperature stability of CgA using …We have used the tumor marker chromogranin A (CgA) to assess hepatic resection in patients with neuroendocrine metastatic tumor disease. Since 1998, seven patients (3 men) of median age 73 years (range 64-84 years) with carcinoid primary tumors in the ileum who had solitary (n = 2) or multiple (n = 5) liver metastases underwent hepatic resections.Chromogranin A (CgA) is a hydrophilic acidic one-chain peptide containing 439 amino acids, preceded by NH2-terminal 18-amino-acid signal pep-tide; the complete pre-chromogranin A molecule thus encompasses 457 amino acids. It is a member of the chromogranin family that comprises several pro-teins.If you receive a bill from Labcorp, you may make a payment using one of the following methods: Website: Visit the Bill Pay section, available 24 hours a day, 7 days a week.; Toll-free telephone number: Call the automated voice response system at 800-845-6167, available 24 hours a day, 7 days a week.; Mail: Send your payment to the address …The consequences of subclinical thyroid disease (serum TSH 0.1−0.45 μIU/mL or 4.5−10.0 μIU/mL) are minimal and current guidelines recommend against routine treatment of patients with TSH levels in these ranges, but thyroid function tests should be repeated at 6- to 12-month intervals to monitor TSH levels; 8 however, treatment of subclinical …Interferencia. Falošné zvýšenie CgA môžu spôsobiť zápaly, renálna insuficiencia, gastritída typu A, liečba inhibítormi protónovej pumpy akortikosteroidmi. Mierne zvýšené koncentrácie nachádzame aj u žien po menopauze. Použiteľnosť pre prax. Diagnostika neuroendokrinných nádorov, kontrola účinnosti terapie.Reagent Provided. Monoclonal mouse antibody provided in liquid form as cell culture supernatant dialysed against 50 mmol/L Tris-HCl, pH 7.2, and containing 15 mmol/L NaN 3. Solutions. Concentrate. Species. Mouse Anti-Human. Specificity. In ELISA, the antibody reacts with the pure chromogranin A fragment used for immunization.This work aims to assess the diagnostic value of chromogranin A (CgA) in the laboratory diagnosis of neuroendocrine tumors classified as pheochromocytoma and paraganglioma (PPGL). Methods A comprehensive search was performed in PubMed, Embase, the Cochrane Library, and Web of Science databases to obtain relevant studies reporting the diagnostic ...Additional Information. The NMR LipoProfile® test is an FDA-cleared blood test that directly measures the amount of LDL circulating in the body. "LDL" is low-density lipoprotein and has long been recognized as a major causal factor in the development of heart disease.Keywords: Chromogranin A, Monoclonal antibody, Immunohistochemistry, Specifility, iELISA Background Human chromogranin A (CgA) consists of 457 amino acid with molecular weight ~49 kDa, and its gene is located in chromosome 14 of Homo sapiens. As a member of Granin protein family, CgA is mainly produced by endocrine cells ….

Chromogranin A is a useful diagnostic biomarker for neuroendocrine tumors such as carcinoid tumors, pheochromocytoma and neuroblastoma. Serum chromogranin A and urine 5-hydroxyindolacetic acid (5-HIAA) are considered to be the most useful biochemical markers for carcinoid tumors. Carcinoid tumors almost always secrete chromogranin A in addition ...CHROMOGRANIN A (CgA), a 48-kDa acidic secretory protein, is the major soluble protein in the catecholamine storage vesicles, and is widely distributed in endocrine cells and neurons (1, 2).It is coreleased with catecholamines, neuropeptides, and ATP by exocytosis from chromaffin cells of the adrenal medulla as well as from sympathetic …CHROMOGRANIN A (CgA), a 48-kDa acidic secretory protein, is the major soluble protein in the catecholamine storage vesicles, and is widely distributed in endocrine cells and neurons (1, 2).It is coreleased with catecholamines, neuropeptides, and ATP by exocytosis from chromaffin cells of the adrenal medulla as well as from sympathetic …Immunohistochemical Stains. Frozen Gel Packs. To ensure specimen integrity during warm weather, follow these Instructions for Use of frozen gel packs and specimen lockboxes. View Labcorp's Immunohistochemical Stains & their IHC Antibody List which includes the name, synonyms, and antibody description / clinical use.A Chromogranin A koncentrációja korrelál a betegség aktivitásával és a tumor méretével, ezért a vizsgálat a betegség nyomon követésére is használatos, ugyanis CgA érték növekedése a daganatos folyamat progresszióját, a tumor növekedését is jelzi. Elsősorban az elő és utóbélben jelentkező karcinoid tumorok ...LDH test cost is between $36.00 and $799.00. None. $36.00. Order. Walk-In Lab. Liver Profile #1 Baseline Blood Test Panel. Covered tests: Lactic Acid Dehydrogenase (LD) ( LabCorp ) , Extra tests (click to add to search): Cholesterol, Total ( LabCorp ) , γ-Glutamyl Transferase (GGT) ( LabCorp ) , Hepatic Function Panel (7) ( LabCorp ) Covered ...Metanephrine and normetanephrine (collectively referred to as metanephrines) are the 3-methoxy metabolites of epinephrine and norepinephrine, respectively. The metanephrines are stable metabolites and are cosecreted directly with catecholamines by pheochromocytomas and other neural crest tumors. This results in sustained elevations in plasma ...Chromogranin A. Order Name CHROMOG A Test Number: 3803557 Revision Date 12/12/2022. Test Name LOINC Code; Chromogranin A 9811-1 SPECIMEN REQUIREMENTS; Specimen: Specimen Volume (min) Specimen Type ... Labcorp Test Code: 140848: CPT Code(s) 86316: Service Provided By:Simply search above for the lab you'd like to visit and select Make Appointment. From there, you'll be able to select an available time that works for you. Find a lab near you to collect samples for testing at Labcorp patient service centers. Walk-in appointments available, or schedule routine blood tests. Chromogranin a labcorp, LabCorp is a trusted name in the healthcare industry, known for its commitment to providing quality laboratory services. One of the reasons why LabCorp stands out from its competit..., 72 years old patient was send to endocrinological outpatients clinic with suspect to nevroendocrine tumor (NET) with chromogranin A (CgA) level 379 μg/l (range 19.4-98.1). She described abdominal colic and diarrhoea lasting 2-3 hours after meals accompanied by dizziness, drenching sweat and lower blood pressure for the last 2 years., Get ratings and reviews for the top 10 moving companies in Oxon Hill, MD. Helping you find the best moving companies for the job. Expert Advice On Improving Your Home All Projects ..., Midlands Collection & Information Manual Reference Range Summary Critical Values Summary Laboratory Services LabCorp Test Catalog . ... Chromogranin A, LC/MS/MS Test Code. 31911. Alias/See Also. 1230500125 | LAB7137: Chromogranin A | QUEST EAP: 31911. CPT Codes 86316 Preferred Specimen. 1 mL serum spun collected in a red-top tube (no gel ..., בדיקת כרומוגרנין A בדם (CHROMOGRANIN A) כרומוגרנין A (CgA) הוא חלבון המופרש על ידי תאים נוירואנדוקרינים, תאים בעלי מאפיינים של תאי עצב המפרישים הורמונים ונמצאים באיברים שונים בגוף. גידול הנוצר מתאים ..., Informatii generale. Cromogranina A este o proteina cu greutatea moleculara de 49 kD alcatuita din 439 aminoacizi. Face parte din familia graninelor care se gasesc in veziculele secretorii ale celulelor neuroendocrine. Rolul acestora este de a regla activitatea secretorie a acestor celule. Datorita raspandirii ubicuitare in tesuturile ..., Chromogranin A is currently the most useful general biomarker for the assessment of GEP-NET. This review summarizes the biochemical characteristics of chromogranin A, its specificity and sensitivity for GEP-NET diagnosis, and its use in monitoring treatment effectiveness, disease progression and prognosis. , The quantitative allergen-specific IgE test is indicated (1) to determine whether an individual has elevated allergen-specific IgE antibodies; (2) if specific allergic sensitivity is needed to allow immunotherapy to be initiated; (3) when testing individuals for agents that may potentially cause anaphylaxis; (4) when evaluating individuals who ..., Weight Loss Panel (Comprehensive) Blood Test. Best: Discover your weight loss barriers with this thorough panel. 4.9 (146) $275.00. $206.25. Save 25%. Add To Cart. , Chromogranin A (CgA), chromogranin B (CgB), and chromogranin C (CgC), which are abundantly expressed in neurons, endocrine, and neuroendocrine cells, are associated with carbohydrate metabolism . These proteins belong to a class of granins, which were first defined as proteins involved in the formation and function of secretory …, Chromogranin A (CgA) is a prohormone initially extracted from the adrenal medulla, however, increased quantities of CgA are secreted by a wide array of human tissues in the course of a variety of disorders. This protein exhibits a number of interesting endocrine and non-endocrine functions. Here we briefly review the possible involvements of ..., Labcorp test details for Chromogranin A. Elevated CGA levels may be seen in non-NEN malignancies including hepatocellular carcinoma 41 and breast cancer. 42. Circulating CgA is increased in several common, non-neoplastic conditions associated with tissue damage and remolding. 5,43-46 These include: , Dec 12, 2022 · Order Name CHROMOG A. Test Number: 3803557. Revision Date 12/12/2022. Test Name. Methodology. LOINC Code. Chromogranin A. Thermo Fisher BRAHMS Kryptor. 9811-1. , Contact the laboratory prior to specimen collection. This procedure must be scheduled with the laboratory performing the test. The patient should have between two and seven days of sexual abstinence before producing the specimen. This test requires a fresh specimen; therefore, this procedure is available only at sperm testing facilities., כרומוגרנין A (להלן CgA) הוא חלבון הפרשתי המורכב מ-439 חומצות אמיניות, במשקל מולקולארי של 48 עד 60 אלף דלטון, בהתאם לדרגת הגליקוזילציה והזרחון שלו. CgA נמצא בריכוז גבוה בבועיות גדולות הממוקמות בתאים ..., Order Name CHROMOG A. Test Number: 3803557. Revision Date 12/12/2022. Test Name. Methodology. LOINC Code. Chromogranin A. Thermo Fisher BRAHMS Kryptor. 9811-1., Vascular endothelial growth factor (VEGF) is a homodimeric 34 to 45 kilodalton, heparin-binding glycoprotein. VEGF has potent angiogenic, mitogenic and vascular permeability-enhancing activities specific for endothelial cells. 1,2 VEGF expression is regulated by hypoxia, with levels increasing when cells detect an environment low in oxygen., This assay is used as an aid in the diagnosis of individuals suspected of having congestive heart failure. The test is further indicated for the risk stratification of patients with acute coronary syndrome and congestive heart failure. The test may also serve as an aid in the assessment of increased risk of cardiovascular events and mortality ..., 5 - 7 days. Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider., HIV p24 Antigen/Antibody With Reflex to Confirmation. TEST: 083935. CPT: 87389. If reflex testing is performed, concomitant CPT codes/charges will apply. Updated on 04/21/2024., Chromogranin A. Chromogranin A (CgA) is a large and highly acidic secretory protein of 439 amino acids expressed in most neuroendocrine cells, where it is packed closely together with hormonal or neurotransmitter peptides as well as monoamines in secretory granules or synaptic vesicles., Chromogranin A (CgA) is a 49-kDa acidic glycoprotein that belongs to the granin family, a principal component of dense-core granules in neuroendocrine cells. Its expression generally correlates with the number of dense-core granules in neuroendocrine cells. CgA and hormones are co-secreted from neuroendocrine cells during the secretory …, Chromogranin A (CgA) is an 86 kDa protein that is the major member of the granin family of acidic secretory glycoproteins located in neuroendocrine cells. CgA is believed to play a role in targeting peptide hormones and neurotransmitters to granules of the regulated pathways and inhibit hormone and neurotransmitter release. Also, the widespread ..., Weight Loss Panel (Comprehensive) Blood Test. Best: Discover your weight loss barriers with this thorough panel. 4.9 (146) $275.00. $206.25. Save 25%. Add To Cart. , Labcorp test info in Chromogranin A. Patients & Individuals (Press Enter or Space to Go to Landing Page or Press Down to expand Menu) Patients & Individuals expand menu, The rapid identification of group A beta-hemolytic streptococci in the upper respiratory tract. Current status. Pediatr Clin North Am. 1988 Jun; 35 (3):535-542. PubMed 3287313. Nadler HL. Group A strep detection. Diagn Clin Test. 1989; 27 (3):35-41 (review of rapid methods). Rapid diagnostic tests for group A streptococcal pharyngitis., Chromogranin A (CgA), present in the chromaffin granules of neuroendocrine cells, is a useful biomarker for the diagnosis of patients with gastroenteropancreatic neuroendocrine tumors (GEP-NETs). This study was conducted to investigate the potential role of circulating CgA in monitoring clinical response in …, PubMed 12788870. 34. Algeciras-Schimnich A, Preissner CM, Young WF Jr, Singh RJ, Grebe SK. Plasma chromogranin A or urine fractionated metanephrines follow-up testing improves the diagnostic accuracy of plasma fractionated metanephrines for pheochromocytoma. J Clin Endocrinol Metab. 2008 Jan;93 (1):91-95. PubMed 17940110., Chromogranin A. Order Name CHROMOG A Test Number: 3803557 Revision Date 12/12/2022. Test Name LOINC Code; Chromogranin A 9811-1 SPECIMEN REQUIREMENTS; Specimen: Specimen Volume (min) Specimen Type ... Labcorp Test Code: 140848: CPT Code(s) 86316: Service Provided By:, None Cancer Antigen (CA) 15-3 test cost minimal is in LifeExtension (Cancer Antigen 15-3 Blood Test) with price $66.00. Cancer Antigen (CA) 15-3 test cost max is in True Health Labs (MLBC) with price $770.00. This laboratory test is available in 7 online lab test stores., Purpose We evaluated the pattern of chromogranin A (CgA) plasma levels in a large number of patients with neuroendocrine tumors (NETs), in a series of patients with chronic atrophic gastritis (CAG) with and without enterochromaffin-like (ECL) cell hyperplasia, and in healthy participants (HPs). Patients and Methods Two hundred thirty-eight patients with NETs, 42 patients with CAG with or ..., Chromogranin A is widely expressed in neuronal tissues and in secretory granules of human endocrine cells such as parathyroid gland, adrenal medulla, anterior pituitary gland, Langerhans islets of the pancreas, and C-cells of the thyroid. It is useful for the identification of tumors with neuroendocrine differentiation such as pituitary ..., Chromogranin A is also elevated in 80% to 90% of patients with symptomatic foregut and midgut tumors. -Urine serotonin is in most circumstances the least likely marker to be elevated. The exception is tumors (usually foregut tumors) that produce predominately 5-HTP, rather than serotonin, and also secrete little, if any, chromogranin A.