Management of Free Fluid in Left Upper and Lower Quadrants

Trauma Context

Hemodynamically unstable patients with free fluid in the left upper quadrant (LUQ) and left lower quadrant (LLQ) require immediate surgical intervention regardless of identified solid organ injury 1
The FAST examination should evaluate specific potential spaces in the LUQ systematically, including the pleural space, subphrenic space, splenorenal space, and left paracolic gutter 2, 3, 4
Ultrasound sensitivity is 79% with negative predictive value of 93% for intra-abdominal injury in hypotensive patients—a negative FAST does not exclude injury and should not preclude further diagnostic testing in unstable patients 1
The American College of Emergency Physicians recommends that hemodynamically stable patients with free fluid in LUQ/LLQ undergo CT abdomen/pelvis with IV contrast for definitive evaluation, as stated in the Annals of Emergency Medicine 6

Diverticulitis is the most common cause of left lower quadrant pain in adults and may present with associated free fluid, according to the Journal of the American College of Radiology 7, 6
CT abdomen and pelvis with IV contrast is the initial imaging of choice with up to 98% accuracy for diagnosing causes of left-sided abdominal pain, as recommended by the American College of Radiology 6
The American College of Radiology recommends that patients with signs of peritonitis and free fluid have a low threshold for surgical exploration, and stable patients with free fluid and identified pathology undergo medical management with possible interventional drainage 7

All ultrasound interpretations should be documented contemporaneously, including indication for procedure, description of organs/structures studied, interpretation of findings, and retained images when possible for quality assurance 4, 3, 2