Glucagon is a hormone that your pancreas makes to help regulate your blood glucose levels. Glucagon increases your blood sugar level and prevents it from dropping too low, whereas insulin, another hormone, decreases blood sugar levels.
To regulate glucose, Glucagon acts on the liver in several ways:
- It stimulates the conversion of stored glycogen (stored in the liver) to glucose, which can be released into the bloodstream. This process is called glycogenolysis.
- It promotes the production of glucose from amino acid molecules. This process is called gluconeogenesis.
- It reduces glucose consumption by the liver so that as much glucose as possible can be secreted into the bloodstream to maintain blood glucose levels.
Your doctor may measure glucagon level if you have symptoms of:
- Diabetes (not commonly measured)
- Glucagonoma (rare tumor of the pancreas) with symptoms of a skin rash called necrotizing migratory erythema, weight loss, mild diabetes, anemia, stomatitis, glossitis
- Growth hormone deficiency in children
- Liver cirrhosis (scarring of the liver and poor liver function)
- Low blood sugar (hypoglycemia) -- most common reason
- Multiple endocrine neoplasia type I (disease in which one or more of the endocrine glands are overactive or form a tumor)
- Pancreatitis (inflammation of the pancreas)
References:
Rix I, Nexøe-Larsen C, Bergmann NC, et al. Glucagon Physiology. [Updated 2019 Jul 16]. In: Feingold KR, Anawalt B, Blackman MR, et al., editors. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2000-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK279127/
In diabetic patients, low glucagon levels (undetectable or in the lower quartile of the normal range) in the presence of hypoglycemia (where your blood glucose level is lower than the standard range) indicate impairment of hypoglycemic counterregulation.
Glucose counterregulation is the sum of processes that protect against development of hypoglycemia and that restore euglycemia if hypoglycemia should occur. In order of importance, the key counterregulatory factors are glucagon, epinephrine, growth hormone, cortisol, and hepatic autoregulation.
These patients may be particularly prone to recurrent hypoglycemia. This can be a permanent problem due to islet alpha-cell destruction or other, less well understood processes (eg, autonomous neuropathy - when there is damage to the nerves that control automatic body functions). It can also be functional, most often due to over-tight blood glucose control and may be reversible after decreasing insulin doses.
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Elevated glucagon levels in the absence of hypoglycemia may indicate the presence of a glucagon-secreting tumor. Successful treatment of a glucagon-secreting tumor is associated with normalization of glucagon levels.
Inappropriate elevations in glucagon levels in hyperglycemic type I diabetic patients indicate that paradoxical glucagon release may contribute to disease severity. This can be observed if insulin treatment is inadequate and patients are ketotic. However, glucagon measurement plays little, if any, role in the diagnostic workup of diabetic ketoacidosis, which is based on demonstrating significantly elevated plasma or serum glucose (>250 mg/dL), circulating ketones (beta-hydroxy butyrate), and acidosis (typically with increased anion gap).
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17-Hydroxypregnenolone, MS (female), 17-OH Progesterone, ACTH, Plasma, ADH, Aldos/Renin Ratio, Aldosterone, Aldosterone/Plasma Renin Activity Ratio, Anti-Mullerian Hormone (AMH), Calcitonin, Serum, Cortisol - ACTH (Cortrosyn) Stimulation Test, Cortisol - AM (Serum), Cortisol, Serum, Cortisol-Binding Globulin (CBG), DHEA, Unconjugated, DHEA-S : Cortisol Ratio, DHEAS (Serum), Estradiol, Estradiol (male), Estradiol, Ultrasensitive, LC/MS, Estriol, Serum, Estrogens, Total (female), Estrogens, Total (male), Estrone, Serum (Female), Estrone, Serum (Male), Free Cortisol, Serum, Free Estradiol, Percent, Free Estradiol, Serum, Glucagon, Growth Hormone, Human Chorionic Gonadotropin (hCG), Total, IA-2 Autoantibodies, IGF Binding Protein 1 (IGFBP 1), IGF Binding Protein 3 (IGFBP 3), Leptin, Pregnenolone (male), Progesterone (male), Progesterone (Serum), Prolactin, Renin Activity, Plasma