Describes the specimen type validated for testing
Defines the optimal specimen required to perform the test and the preferred volume to complete testing
Patient preparation: Patient should be fasting 10 - 12 hours prior to collection. Patient should not be on any medications or supplements that may influence: Cholecystokinin (CCK), Glucose, Growth Hormone, Insulin and/or Somatostatin levels, if possible for at least 48 hours prior to specimen collection
Specimen Type: GI Plasma
Container/Tube: Special tube containing G.I. Preservative (MCL supply number T125).
Specimen Volume: 10mL
Collection Instructions: Draw 10 mL of blood in special tube containing G.I. Preservative (MCL supply number T125). Specimen should be separated in refrigerated centrifuge as soon as possible and send 3 - 5 mL plasma frozen. Ship frozen.
Specimen Minimum Volume
Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory
Reject Due To
Identifies specimen types and conditions that may cause the specimen to be rejected
| Hemolysis || NA |
| Lipemia || NA |
| Icterus || NA |
| Other || NA |
Specimen Stability Information
Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included
Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
Ghrelin is a novel 28 amino acid peptide derived by post-translational processes from a preproghrelin consisting of 117 residues, secreted by the stomach with specific receptors in the brain involved in appetite regulation. It conveys information to the brain thereby increasing appetite, food intake and body weight and influences the release of growth hormone. Ghrelin is a growth hormone-releasing peptide which acts as an endogenous ligand of the growth hormone secretagogue receptors (GHS-Rs). Ghrelin levels are inversely correlated with body weight and are higher during weight loss.
Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
GHRELIN (Total): pg/mL
Adult Reference Range(s)
Normal weight/control subjects: 520 - 700 pg/mL
Obese subjects prior to diet: 340 - 450 pg/mL
8:00 am - 12:00 pm: Up to 420 pg/mL
6:00pm: Up to 480 pg/mL
Obese subjects post induced weight loss: 450 - 600 pg/mL
8:00 am - 12:00 pm: Up to 575 pg/mL
6:00 pm: Up to 600 pg/mL
Obese subjects post gastric-bypass surgery: Up to 120 pg/mL
Indicates whether the report includes an additional document with charts, images or other enriched information
Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.
Varied; Monday through Friday
The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.
7 to 12 days
Performing Laboratory Location
Indicates the location of the laboratory that performs the test
Inter Science Institute
Several factors determine the fee charged to perform a test. Contact your U.S. or International Regional Manager for information about establishing a fee schedule or to learn more about resources to optimize test selection.
- Authorized users can sign in to Test Prices for detailed fee information.
- Clients without access to Test Prices can contact Customer Service 24 hours a day, seven days a week.
- Prospective clients should contact their Regional Manager. For assistance, contact Customer Service.
Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR) product.
This test was performed using a kit that has not been cleared or approved by the FDA and is designated as research use only. The analytic performance characteristics of this test have been determined by Inter Science Institute. This test is not intended for diagnosis or patient management decisions without confirmation by other medically established means.
CPT Code Information
Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Clinic Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.
CPT codes are provided by the performing laboratory.
Test Setup Resources
Test setup information contains test file definition details to support order and result interfacing between Mayo Clinic Laboratories and your Laboratory Information System.
Excel | Pdf
SI Sample Reports
International System (SI) of Unit reports are provided for a limited number of tests. These reports are intended for international account use and are only available through MayoLINK accounts that have been defined to receive them.
SI Normal Reports |
SI Abnormal Reports