The GI medical abbreviation stands for gastrointestinal, which refers to the digestive tract from the mouth through the stomach and intestines to the anus. In hospitals the same letters also name the specialty that treats those organs, gastroenterology, so "call GI" means asking the digestive disease team to see a patient.
You will see GI on referrals, consult notes, scan orders and diet sheets. Nutrition labels and diet guides use GI for glycemic index, a separate idea. Read on for how to tell those uses apart, what GI bleed and FEN/GI mean in a note, and which related terms students learn next.
At a glance
Stands for
Gastrointestinal (digestive tract)Other meanings
Gastroenterology service; glycemic index in nutritionWord roots
gastr/o stomach, intestin/o intestineWhere you see it
Consult requests, review of systems, imaging ordersCommon phrases
GI bleed, upper GI, GI upset, GI prophylaxisSpecialist
Gastroenterologist, often called a GI doctor
What the GI medical abbreviation means in a chart
As a body system, GI covers the esophagus, stomach, small intestine, large intestine, rectum and anus, plus organs that help digestion such as the liver, gallbladder and pancreas in many teaching outlines. The word gastrointestinal joins the roots for stomach and intestine.
In a review of systems, a GI line lists digestive symptoms the patient has or denies, such as nausea, vomiting, abdominal pain, diarrhea, constipation or blood in the stool. In the exam, the abdominal findings are often charted under GI or under ABD. On a care plan, a GI heading groups bowel habits, diet tolerance and any feeding tubes.
Common GI phrases decoded
| Phrase | Meaning |
|---|---|
| GI bleed | Blood loss from any point along the gut, sometimes written GIB |
| Upper GI | The food pipe, the stomach and the duodenum; also an x-ray study with swallowed contrast |
| Lower GI | The colon, rectum and anus |
| GI upset | Stomach discomfort, nausea or loose stools, often listed as a side effect |
| GI prophylaxis | Medicine to protect the stomach lining in very ill patients, often a PPI |
| GI cocktail | A mixed liquid of an antacid with a numbing agent, given for upper stomach pain in some emergency rooms |
GI as the specialty team
Gastroenterology is the branch of internal medicine that treats digestive disease. Patients often say they are seeing "GI" or "a GI doctor." The team performs scope procedures such as EGD for the upper tract, colonoscopy for the colon, and ERCP for the bile and pancreatic ducts.
Hospital progress note: "Hgb down to 7.2, dark stools. GI consulted, plan EGD in AM." The hemoglobin dropped and the stools suggest bleeding higher in the gut, so the digestive team was asked to look with a scope the next morning.
FEN/GI and CLD in hospital notes
In pediatric, newborn intensive care and some adult notes organized by body system, you may see a heading FEN/GI. FEN stands for fluids, electrolytes and nutrition, and GI adds the gut, so this section covers IV fluids, lab salts like sodium and potassium, feeding plans and bowel function together.
CLD near GI can mean two different things. In a diet order it often means clear liquid diet, such as broth, clear juice and gelatin. In a problem list it more often means chronic liver disease, which has its own CLD page. Read the line around it to decide.
Glycemic index and other meanings
Outside the chart, GI often means glycemic index, a scale that ranks carbohydrate foods by how quickly they raise blood sugar compared with pure glucose. Diabetes educators and dietitians use it when talking about food choices. It is a nutrition term and does not refer to the gut.
Rarely, GI may appear in other ways in specific fields, but in a doctor's note, a discharge sheet or a referral, gastrointestinal or gastroenterology is almost always the meaning. Context tells you which of those two: a body system in a symptom list, a team in a consult line.
Frequently asked questions
What does GI stand for in medical terms?
GI stands for gastrointestinal, meaning the digestive tract. It is also used as short for gastroenterology, the medical specialty that treats digestive problems.
What is a GI doctor?
A GI doctor is a gastroenterologist, a physician trained in internal medicine and then in diseases of the digestive system and liver. They often perform scope procedures such as colonoscopy.
What does upper GI mean?
Upper GI covers the food pipe, the stomach and the duodenum, which is where the small bowel begins. An upper GI study is also an x-ray test in which you swallow contrast so these organs show up on the images.
What does FEN/GI mean in a hospital note?
It is a section heading that groups fluids, electrolytes, nutrition and gut function. Pediatric and newborn intensive care notes use it often.
Is GI the same as glycemic index?
Only in nutrition writing. In a medical chart GI almost always means gastrointestinal, while diet guides use GI for glycemic index, a ranking of how fast foods raise blood sugar.