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The fluid wave test is of limited sensitivity because it requires sufficient fluid in the peritoneal cavity to make a wave. A fluid wave can be detected in the erect position in some patients when it is no apparent in the supine position.
Positive test: The examiner is able to detect "a shock wave" of fluid moving against the fingertips pressed along the flank, as the fluid is pushed from one side of the abdomen to the other by the force of the tap along the opposite flank.
In medicine, the fluid wave test or fluid thrill test is a test for ascites (free fluid in the peritoneal cavity). It is performed by having the patient (or a colleague) push their hands down on the midline of the abdomen.
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Learn how to test for shifting dullness; Learn how to test for a fluid wave; Describe abdominal venous patterns
Ultrasound is the most sensitive test to detect ascites. It will reveal homogenous freely mobile anechoic collection in the peritoneal cavity. The smallest amount of fluid is usually seen in Morison pouch.
Assessment for Ascites. Physicians should be familiar with the signs of ascites and physical examination maneuvers that can be used to detect ascites. The sensitivity of these maneuvers is limited by the amount of peritoneal fluid present, and ultrasound is useful in defining small amounts of fluid. A pleural effusion is found in a small ...
Fluid wave test. A physical examination maneuver performed to evaluate for the presence of ascites. With the patient supine and a second examiner's hand on the midline (to stop transmission through fat), place one hand on the patient's lateral abdominal wall and tap the opposite lateral abdominal wall with the other hand.
Ascites is free fluid in the peritoneal cavity. The most common cause is portal hypertension. Symptoms usually result from abdominal distention. Diagnosis is based on physical examination and often ultrasonography or CT. Treatments include dietary sodium restriction, diuretics, and therapeutic paracentesis.
The fluid wave test is of limited sensitivity because it requires sufficient fluid in the peritoneal cavity to make a wave. A fluid wave can be detected in the erect position in some patients when it is no apparent in the supine position.