Introduction
The abdominal examination is a cornerstone of clinical assessment, providing invaluable clues to a broad spectrum of underlying conditions. Despite advances in diagnostic imaging and laboratory testing, a thorough and systematic abdominal exam remains essential for identifying pathology, guiding further evaluation, and building clinical reasoning skills. In some cases, examination findings can reveal life-threatening conditions, eg, bowel obstruction, peritonitis, a ruptured ectopic pregnancy, or a ruptured abdominal aortic aneurysm, requiring immediate action. To perform a proficient abdominal examination and utilize the results for clinical decision-making, clinicians must be aware of the pertinent anatomy, including proper terminology for the different locations within the abdomen, as well as potential differential diagnoses associated with the patient's history and examination findings.
Abdominal Regions
The most common way to divide the abdomen is through a vertical and horizontal line that bisects at the umbilicus, creating 4 quadrants: left and right upper and lower. Alternatively, the abdomen can be divided into 9 regions using 2 horizontal planes, the subcostal and intertubercular planes, and 2 vertical midclavicular planes (see Image. The 9 Regions of the Abdomen). The examination should follow a systematic sequence comprising inspection, auscultation, percussion, and palpation, while adjusting for the patient’s age, level of distress, and the clinical context. Inspection provides information on the patient’s level of distress and overall stability, as well as the abdominal contour, scars, and possibly signs of peritonitis.
Furthermore, auscultation aids in detecting the presence of an ileus, obstruction, or vascular bruits. Percussion and palpation are used to evaluate for pain, ascites, organomegaly, or masses, and to identify guarding or rebound tenderness. Additional steps, eg, rectal or pelvic examinations, may be necessary to uncover findings that are not evident on the abdominal examination alone. Proper patient positioning, exposure, and use of correct anatomical landmarks are essential for accurate localization of findings. Ultimately, an effective abdominal examination requires the integration of physical manifestations with the patient’s history, paying careful attention to technique, and clearly communicating results to support diagnostic reasoning, patient safety, and interprofessional decision-making.
Function
A structured abdominal examination follows a systematic sequence of inspection, auscultation, percussion, and palpation.
Patient Positioning
For optimal results, the patient should lie comfortably in a supine position with arms resting at the sides and the head and knees supported by a small pillow or folded sheets to relax the abdominal wall. Before beginning, the clinician should ask whether the patient experiences abdominal pain and request that they identify the area of greatest discomfort.
In certain cases, particularly with distressed children, performing the examination while the child sits on a caregiver’s lap may be more effective. Providing appropriate analgesia enhances comfort without diminishing the accuracy or diagnostic value of the examination.[1] Adequate lighting and full exposure of the abdomen, while maintaining privacy, ensure a thorough evaluation. Standing on the patient’s right side allows easier access to the liver without requiring the examiner to reach across the patient.
Inspection
The examination begins with a visual assessment of the patient, observing vital signs and overall distress. Weight loss may appear as decreased abdominal girth, a scaphoid contour, or loose skin. Several visual findings guide differential diagnosis during abdominal assessment:
Abdominal distension
Dilated abdominal wall veins (may indicate portal hypertension or inferior vena cava compression)
Everted umbilicus
Cullen sign (periumbilical ecchymosis suggesting intra-abdominal bleeding)
Grey Turner sign (flank ecchymosis suggesting retroperitoneal hemorrhage)
Jaundice
Localized bulges
Pulsatile mass (suggestive of an abdominal aortic aneurysm)
Scars from previous abdominal surgeries
Striae (stretch marks, often from ascites, obesity, or Cushing syndrome)
[2][3]Visible peristalsis (may be seen in bowel obstruction)
Rash
To identify the cause of dilated abdominal wall veins, clinicians should assess blood flow direction. For instance, patients with portal hypertension exhibit flow away from the umbilicus as the body bypasses portal circulation.[4] For patients with a stoma, the surrounding skin should be inspected for erythema, ulceration, or fistula formation, followed by an evaluation of the stoma for parastomal hernia, prolapse, retraction, or necrosis.
Ascultation
After completing the visual assessment, clinicians place the diaphragm of the stethoscope on the abdominal wall with gentle pressure to assess the presence and quality of bowel sounds. Auscultation precedes palpation to prevent provocation or suppression of bowel activity through mechanical stimulation. Normal bowel sounds are low-pitched and gurgling, occurring at a rate of 5 to 35 sounds per minute.[5] When bowel sounds are initially absent, listening should continue for 1 to 2 minutes to confirm their absence, though some experts recommend up to 5 minutes. Traditionally, clinicians auscultate all 4 quadrants, yet recent evidence indicates that bowel sounds transmit throughout the abdomen and do not correspond to localized peristaltic activity.[6] The stethoscope should next be positioned above the umbilicus to detect an aortic bruit, then moved 2 cm above and lateral to the umbilicus on each side to assess for renal artery bruits. Auscultation of the flanks and back remains important, as renal artery bruits may be more distinct in these areas.[7]
Characteristic auscultatory findings can provide important diagnostic clues to underlying abdominal pathology. Common abnormalities and their associated clinical implications include:
High-pitched bowel sounds: Often described as "tinkling" or "musical", this finding may indicate ileus or early small bowel obstruction.
Bruits: Auscultation of bruits is suggestive of arterial stenosis or aneurysmal dilatation, neovascularization of malignancies, or increased vascular flow as seen in cirrhosis or alcohol-associated hepatitis.
Absent bowel sounds: Bowel obstruction, intestinal ischemia, paralytic ileus, or peritonitis often results in the lack of typical bowel sounds.
Hyperactive bowel sounds: This finding may be associated with anxiety, gastroenteritis, laxative use, lactose or other food intolerance, irritable bowel syndrome, inflammatory bowel disease, gastrointestinal bleeding, and early small-bowel obstruction.
[8] Friction rub: Auscultation of a friction rub is suggestive of splenic infarction, hepatic metastases, peritonitis, or infection, eg, Fitz–Hugh–Curtis syndrome, though clinicians must ensure the sound is not referred from a different organ system.
[9] Abdominal venous hum: This finding is often noted in patients with portal vein hypertension.
[10]
Percussion
Percussion assists in estimating the size of the liver and spleen, as well as identifying intra-abdominal or pelvic masses. During percussion, clinicians may detect tympany—a high-pitched, drum-like sound over air-filled structures; dullness—a quieter, muffled tone over solid organs or fluid-filled areas; and resonance—a low-pitched, hollow sound typically heard over the lungs. To perform percussion, the clinician places the nondominant hand firmly on the patient’s abdomen, positioning the distal interphalangeal joint of the middle finger as the pleximeter. Using the dominant hand, the clinician taps the pleximeter finger with a quick, sharp motion delivered from the wrist using the tip of the middle or index and middle fingers. The forearm should remain relaxed, and the striking finger must lift promptly after each tap to prevent sound dampening.
Liver span estimation begins by percussing along the right midclavicular line, starting around the third intercostal space, where lung resonance remains audible. The examiner moves downward until the note changes to dullness, marking the upper liver border. From below the umbilicus in an area of tympany, percussion continues upward along the same line until dullness returns, indicating the lower liver border. The maneuver should be repeated during both normal breathing and breath-holding. Movement with respiration confirms that the dullness is due to the liver and assesses diaphragmatic mobility. The average liver span extends between the fifth intercostal space and the lower costal margin along the midclavicular line, measuring approximately 9 to 12 cm in adults. Typically, the midclavicular span exceeds the midsternal span. When the midsternal measurement equals or surpasses the midclavicular span, left lobe enlargement is suggested, often reflecting cirrhosis. A firm epigastric mass may also indicate an enlarged left lobe.
Percussion of the spleen involves following the left anterior axillary line down to the last intercostal space. Under normal conditions, this area produces a tympanic note. A change to dullness during deep inspiration suggests splenic enlargement, known as the Castell sign, which demonstrates moderate sensitivity and specificity (82% and 83%, respectively).[11] Dullness over the Traube space also supports splenomegaly. The Traube space lies between the left sixth rib superiorly, the anterior axillary line laterally, and the left costal margin inferiorly. False-positive dullness can occur in patients with hepatomegaly, recent food intake, or obesity.[12]
To evaluate for ascites, percussion begins at the abdominal midline and proceeds laterally toward the flanks. In ascitic patients, the percussion note shifts from tympanic to dull on both sides. Afterward, the patient is turned into a lateral decubitus position, and percussion is repeated. In the presence of ascites, fluid gravitates to the dependent side, creating “shifting dullness,” while the contralateral flank becomes resonant.[13][14]
The following findings encountered during the percussion portion of the abdominal examination may be suggestive of a wide range of differential diagnoses:
Hepatomegaly: Viral hepatitis, liver abscess, parasitic infections, malignancy, Wilson disease, hemochromatosis, congestive heart failure, metabolic dysfunction-associated steatotic liver disease, alcohol-associated fatty liver disease, Budd-Chiari syndrome, primary biliary cholangitis, primary sclerosing cholangitis, disorders of lipid metabolism, disorders of glycogen metabolism, hepatic sinusoidal obstruction syndrome, Gaucher disease, α-1 antitrypsin deficiency, Caroli disease, and polycystic liver disease
Splenomegaly: Liver disease, portal, hepatic, or splanchnic vein thrombosis, hematologic malignancies, autoimmune hemolytic anemia, immune thrombocytopenia, immune neutropenia, extramedullary hematopoiesis due to primary myelofibrosis, secondary myelofibrosis, transfusion-dependent thalassemia, multiple infections such as Babesiosis, HIV, Epstein-Barr virus, malaria, mycobacteria, and leptospirosis, systemic lupus erythematosus, amyloidosis, sarcoidosis, hematoma formation after trauma, and metastatic disease
[16][17][18]
Additionally, hepatomegaly in the absence of jaundice should encourage clinicians to consider metabolic diseases.
Palpation
Palpation of the abdomen begins with light palpation across all 4 quadrants to assess tenderness on both the application and release of pressure. During this step, clinicians also evaluate for crepitus, masses, hernias, nodularity, guarding, anesthesia, or hyperesthesia.[19] Deep palpation follows, starting away from any area of pain. To achieve greater depth control, the palpating hand may be reinforced by applying pressure with the opposite hand, or the blade of the hand may be used to minimize excessive fingertip pressure.
Liver palpation proceeds by moving upward from the right lower quadrant toward the right costal margin until the liver edge is felt. The right hand is placed just below the costal margin while the patient exhales fully and then inhales deeply, allowing the liver edge to descend beneath the fingertips. The upper border of the liver cannot be palpated. In patients with suspected acute cholecystitis, the gallbladder is palpated just below the liver edge during deep inspiration. Increased pain and interruption of inspiration indicate a positive Murphy sign, consistent with inflammation. Palpation of the spleen begins in the right lower quadrant and continues toward the left upper quadrant in an effort to feel the splenic tip. If palpable, the surface texture, consistency, and tenderness of the spleen should be noted.
Guarding may occur voluntarily when the patient tenses the abdominal muscles to protect an inflamed organ, or involuntarily when intra-abdominal pathology causes muscle rigidity. Voluntary guarding often subsides when the patient’s attention is diverted through conversation. Localized tenderness within any of the 9 abdominal regions can suggest organ inflammation. Rebound tenderness is tested by gently pressing on the abdomen during inspiration and releasing quickly; pain upon release indicates peritoneal irritation (Blumberg sign). In children or anxious patients, gentler methods, eg, jostling the bed or moving the patient’s feet, can be used. Pain elicited by these maneuvers, or by hopping, may also indicate peritonitis.
In suspected appendicitis, examination of McBurney’s point—located one-third of the distance from the anterior superior iliac spine to the umbilicus—helps confirm the diagnosis. Pain at this point demonstrates a sensitivity of 50% to 94% and specificity of 75% to 86% for acute appendicitis.[20][21] Additional findings include the Rovsing sign, where palpation of the left lower quadrant produces right lower quadrant pain, and the psoas sign, in which passive extension of the right hip elicits pain, suggesting a retrocecal appendix. Pain induced by flexing the right thigh at the hip with the knee bent and internally rotating the leg constitutes a positive obturator sign, which implies irritation of the internal obturator muscle by a pelvic appendix or abscess.[22] This test is less commonly performed due to its low sensitivity of 8%.[23]
Kidney examination employs a bimanual, or “ballottement,” technique. One hand is placed posteriorly beneath the flank to lift the kidney, while the opposite hand palpates anteriorly below the costal margin. For the right kidney, the left hand supports the back as the right hand palpates between the midclavicular and anterior axillary lines; for the left kidney, the hand positions are reversed. This technique helps identify enlarged or cystic kidneys.
Abdominal palpation is insensitive for detecting aortic aneurysms unless quite large.[24] Palpation for an abdominal aortic aneurysm requires a 2-handed method. The hands are positioned along the lower borders of the left and right costal margins, with fingers directed toward the umbilicus and a span of skin separating the index fingers. The aorta is felt as a pulsatile mass, and its width should be measured. A diameter exceeding 2.5 cm suggests an aneurysm and warrants further evaluation with abdominal ultrasound. Palpation may miss aneurysms in patients with obesity or increased abdominal girth.[25]
When delayed gastric emptying is suspected, the clinician places the stethoscope over the abdomen, holds the patient’s hips, and gently rocks the patient side to side. The presence of splashing sounds, known as a succussion splash, indicates fluid retention and thus a positive test that supports the diagnosis.[26]
The periumbilical region should be palpated for defects, hernias, or masses while the patient coughs or strains to accentuate subtle protrusions. The inguinal and suprapubic regions also require examination for hernias or masses. A suprapubic mass may indicate bladder distention, uterine fibroids, or malignancy in women, and bladder pathology in either sex.
Digital Rectal Examination
When indicated, the abdominal assessment concludes with a digital rectal examination (DRE). The patient may be positioned standing and leaning forward, lying in the left lateral decubitus position with the right leg extended and the left leg flexed, or prone with the knees drawn to the chest. Standing and knees-to-chest positions provide optimal prostate evaluation. The examination begins with inspection of the perianal region for hemorrhoids, fissures, warts, skin tags, fistulae, or discharge. Patients with Crohn's disease may show perianal skin tags or sinus tracts. After applying lubricant to a gloved index finger, the clinician asks the patient to exhale while inserting the finger gently into the anal canal, directing it anteriorly toward the umbilicus at the 6 o’clock position.
Sphincter tone is assessed on insertion, followed by systematic palpation. In patients with a prostate, size, tenderness, nodularity, and asymmetry should be evaluated. The rectal walls are examined circumferentially in a clockwise pattern from 6 o’clock to 12 o’clock and back again, noting any masses, induration, nodules, or tenderness. Depending on the clinical scenario, stool collected during the exam may be tested for occult blood.
Additional Physical Examination Findings
Several other clinical findings on abdominal exam can be indicative of more specific diagnoses, requiring further evaluation. A flapping tremor, or asterixis, reflects hepatic encephalopathy and commonly accompanies cirrhosis.[27] A nonspecific tremor may indicate alcohol withdrawal. Kayser-Fleischer rings—a brownish-green corneal discoloration caused by copper deposition at the Descemet membrane—appear in Wilson disease and are best visualized using a slit lamp.[28]
Periorbital plaques, or xanthelasmas, can develop in chronic cholestasis due to lipid accumulation. Angular cheilitis, characterized by fissures at the corners of the mouth, may result from iron or vitamin deficiency secondary to malabsorption.[29] Oral ulcers can suggest Crohn or celiac disease. A smooth, pale, shiny tongue points to iron deficiency, whereas a beefy, red tongue suggests vitamin B12 or folate deficiency. Fetor hepaticus, a distinctive musty odor on the breath, indicates liver dysfunction, while a fruity odor suggests ketonemia. Detection of a Virchow node may signal an underlying malignancy.[30] A skin examination may reveal dermatitis herpetiformis in patients with celiac disease.
Issues of Concern
Although the abdominal examination represents a core component of clinical assessment, several limitations and potential pitfalls can affect its accuracy. Clinicians must recognize these constraints and interpret findings in the context of a detailed history, other physical examination results, and appropriate imaging studies to ensure diagnostic precision.
Underestimation of Organ Size
Clinical examination often underestimates liver size in patients with hepatomegaly. Research demonstrates only moderate correlation between estimated liver span on examination and imaging measurements, which can contribute to delayed or missed diagnoses of hepatic disorders.[31]
Difficulty Detecting Splenomegaly
A mildly enlarged spleen frequently remains impalpable, with some studies suggesting that splenic size must increase by approximately 40% before detection by palpation becomes possible.[32] Identifying the inferior border of a massively enlarged spleen can also be difficult, particularly when the organ extends into the pelvis. Percussion may yield false-positive results due to gastric contents, pleural effusion, a fixed diaphragm, or solid stool within the colon, all of which can mimic splenic dullness, particularly over the Traube space.
Challenges in Detecting Ascites
Shifting dullness may indicate ascites; however, this finding is often not apparent until volumes of fluid in excess of 1500 mL accumulate. Despite this limitation, flank dullness remains a relatively dependable clinical indicator of ascitic fluid presence.[33]
Influence of Patient Factors
Pain, anxiety, and communication difficulties can complicate abdominal evaluation. Older adults, children, and immunocompromised or cognitively impaired patients frequently exhibit atypical or subtle findings. In older adults, weakened musculature and reduced pain perception may obscure rigidity or guarding. Immunocompromised individuals may fail to mount typical inflammatory responses, while children often manifest illness through irritability, crying, or nonspecific symptoms, demanding careful observation and a broad diagnostic differential.[2] Adults with peritonitis tend to remain supine and avoid movement, whereas children with retroperitoneal irritation may prefer sitting upright. Infants who have discomfort while lying supine may have gastroesophageal reflux. In children, thinner abdominal walls and closely positioned organs enhance palpation of masses or organomegaly but can also lead to misinterpretation of normal structures as abnormal findings.
Reliance on Imaging
Reliance on advanced imaging techniques has contributed to the gradual decline in the use of comprehensive abdominal examination, once regarded as a cornerstone of clinical assessment. Data show a marked increase in imaging utilization over recent decades. Among children presenting to emergency departments with abdominal pain, abdominal ultrasound use rose from 4.3% in 1997 to 15.9% in 2016, representing a 4-fold increase. In adults, ultrasound use expanded from 10.5% to 16.6% during the same period, while computed tomography (CT) use for adults with abdominal pain surged from approximately 4% to 37.8%.[34] In pediatric patients, CT utilization increased from 1.2% in 1997 to a peak of 16.6% in 2010, followed by a modest decline by 2016, reflecting initiatives that promote ultrasound as the preferred first-line imaging method to reduce unnecessary radiation exposure.[34]
Inadequate physical examination contributes significantly to medical errors, often resulting in missed or delayed diagnoses, inappropriate treatments, and preventable radiation exposure. A study evaluating documented oversights during physical examinations found that complete omission of the examination accounted for 63% of errors, misinterpretation of findings for 14%, and failure to identify or pursue relevant signs for 11%.[35] These findings underscore the enduring importance of maintaining proficiency in abdominal examination as a fundamental diagnostic skill, even amid widespread reliance on modern imaging modalities.
