The SBO medical abbreviation stands for small bowel obstruction, a partial or complete blockage that stops food, fluid and gas from moving normally through the small intestine. It is a common reason for emergency visits and surgical consults.
You will see SBO on CT reports, emergency notes, surgery consults and hospital progress notes. This page explains what the blockage is, what usually causes it, how a typical order set reads, and which look alike abbreviations to keep separate.
At a glance
Stands for
Small bowel obstructionMost common cause
Adhesions, bands of scar tissue after prior belly surgeryFound on
Forms
Partial SBO, complete SBO, pSBOSpecialty
Emergency medicine, general surgery, radiologyDo not confuse with
LBO, SBP, ileus
What the SBO medical abbreviation describes
The small intestine, also called the small bowel, is the long, folded tube between the stomach and the large intestine. When something narrows or kinks it, contents back up above the blockage. The bowel swells with fluid and gas, and the person often feels crampy belly pain, bloating, nausea and vomiting, and may stop passing gas or stool.
A partial SBO lets some contents through, while a complete SBO lets nothing pass. The most serious concern is strangulation, when the blood supply to a loop of bowel is cut off. That is why surgeons follow these patients closely.
Common causes of a small bowel obstruction
| Cause | How it blocks |
|---|---|
| Adhesions | Scar bands from past surgery pinch or kink the bowel |
| Hernias | A loop of bowel gets trapped in a weak spot of the belly wall |
| Tumors | A growth narrows the bowel from inside or presses from outside |
| Inflammatory bowel disease | Inflammation and scarring narrow the bowel, written as IBD |
| Volvulus or intussusception | The bowel twists or telescopes into itself |
A note that reads "s/p appendectomy, now SBO" hints that old scar tissue from that surgery may be the cause.
Decoding an SBO order set
Early care for SBO follows a familiar pattern, and the orders are packed with shorthand.
| Shorthand | Plain meaning |
|---|---|
| CT A/P | CT scan of the abdomen and pelvis |
| transition point | The spot where swollen bowel meets collapsed bowel, marking the blockage |
| NPO | Nothing by mouth |
| NGT to LIWS | Nasogastric tube to low intermittent wall suction, to drain the stomach |
| surgery consult | A surgeon is asked to evaluate |
Progress note: "pSBO resolving, + flatus, NGT clamped, advance to clears." The partial blockage is easing, the patient is passing gas, and the team is testing whether they can drink clear liquids.
Imaging words you may see with SBO
Radiology reports describe a bowel blockage with a set of standard phrases. Dilated loops means swollen sections of bowel. Air fluid levels are lines where gas sits on top of fluid, seen on upright X rays. Decompressed distal bowel means the bowel beyond the blockage is empty. Words like closed loop, swirl sign or reduced wall enhancement can point toward a more urgent problem with blood supply.
A KUB X ray can suggest SBO, while CT gives more detail about the cause and severity.
SBO versus look alike abbreviations
LBO, large bowel obstruction, is a blockage in the colon and often has different causes, such as cancer or twisting. Ileus is a slowdown of bowel movement without a physical blockage, often after surgery. SBP looks similar on paper but means systolic blood pressure or spontaneous bacterial peritonitis. Some notes also mention SIBO, small intestinal bacterial overgrowth, which is unrelated to blockage.
The diagnosis abbreviations hub gathers other GI and surgical conditions.
What patients and families can ask
Many partial obstructions settle with bowel rest, fluids and suction, while others need surgery. Questions worth asking include whether the blockage is partial or complete, what the likely cause is, which signs would mean surgery is needed, and how eating will restart. After going home, people often ask which symptoms should bring them back.
This page describes a medical abbreviation for general understanding. Belly pain with vomiting or swelling needs prompt assessment, and decisions about care belong with your surgical or emergency team.
Frequently asked questions
What does SBO mean in medical terms?
SBO means small bowel obstruction, a blockage in the small intestine that keeps contents from moving through normally.
What is the most common cause of SBO?
Adhesions, bands of scar tissue that form after earlier abdominal surgery, are the most common cause. Hernias and tumors are other frequent causes.
Does every SBO need surgery?
No. Many partial obstructions improve with nothing by mouth, IV fluids and a tube to drain the stomach. Surgery is needed when the blockage does not ease or blood supply to the bowel is at risk.
What is the difference between SBO and ileus?
SBO is a physical blockage. Ileus is a temporary slowdown of the bowel's movement without anything blocking it, often seen after surgery.