Nursing care
Paracentesis: the nurse's role, start to finish
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Paracentesis nursing management centres on three actions: have the patient void before the procedure to empty the bladder, measure abdominal girth before and after, and monitor closely for hypotension as ascitic fluid is drained. These steps protect against bladder puncture, track fluid shifts, and catch the drop in blood pressure that large-volume paracentesis can cause.
What the procedure achieves
Paracentesis removes excess fluid from the peritoneal cavity, most often ascites related to cirrhosis, malignancy, or heart failure. Small-volume paracentesis is diagnostic, sent for cell count, culture, and albumin to rule out spontaneous bacterial peritonitis or identify malignant cells. Large-volume paracentesis is therapeutic, relieving abdominal pressure that restricts breathing, appetite, and mobility.
The nurse's role runs through the full procedure: preparing the patient and site beforehand, assisting the provider and monitoring haemodynamics during fluid removal, and watching for delayed complications afterwards. Because several litres of fluid can shift out of the vascular space during a therapeutic tap, haemodynamic monitoring is as central to this procedure as the puncture itself.
Pre-procedure nursing responsibilities
The nurse confirms consent, reviews coagulation studies and platelet count since ascites often coexists with liver disease and altered clotting, and obtains baseline vital signs. The patient must void or be catheterised to empty the bladder immediately before the procedure, because a full bladder sits close to the needle path and raises the risk of accidental puncture.
Baseline abdominal girth is measured at the umbilicus with the tape marked or the level recorded so later measurements are taken at the same point. This baseline is what later assessment is compared against, so an accurate starting measurement matters. The nurse also weighs the patient, since ascitic fluid retention is tracked by weight change over time, and confirms IV access is available in case fluid resuscitation is needed during a large-volume tap.
Equipment and positioning
Equipment includes a paracentesis kit with catheter and drainage tubing, sterile drapes, local anaesthetic, collection vacuum bottles or a closed drainage system, and specimen containers for diagnostic samples. Ultrasound guidance is standard practice for identifying a safe puncture site and avoiding bowel or vessels.
The patient is positioned supine with the head of the bed elevated 30 to 45 degrees, or side-lying toward the fluid-dominant side, which allows ascitic fluid to pool by gravity toward the puncture site, usually in the lower quadrant lateral to the rectus muscle. The nurse assists with positioning, exposes the abdomen while maintaining privacy and warmth, and keeps the puncture site accessible to the provider throughout.
Complications and early signs
Hypotension is the complication to anticipate actively during large-volume drainage, since rapid removal of several litres of fluid can cause a significant intravascular fluid shift as fluid redistributes from the vascular space to refill the peritoneal cavity. The nurse monitors blood pressure and heart rate at intervals throughout the drainage, not only at the end, and reports a falling blood pressure or rising heart rate promptly rather than waiting for symptoms to develop.
Other complications include bleeding at the puncture site, bowel or bladder perforation, persistent leakage of ascitic fluid after the catheter is removed, and infection introduced during the procedure. Post-paracentesis circulatory dysfunction can develop hours after a large-volume tap, so orthostatic blood pressure changes and reduced urine output remain relevant even after the immediate procedure ends.
Post-procedure care
The nurse measures abdominal girth again at the same landmark used for the baseline reading and compares it directly against the pre-procedure figure to document the change. Vital signs are rechecked per protocol, typically at frequent intervals for the first hour, watching specifically for the hypotension that large-volume removal can trigger as fluid shifts continue after the tap ends.
The puncture site is assessed for bleeding or persistent drainage and dressed accordingly; ongoing leakage after several hours should be reported. Total fluid volume removed, its colour and clarity, and any specimens sent are documented, along with the patient's tolerance of the procedure. Albumin replacement is often ordered after large-volume paracentesis to counter the intravascular volume shift, and the nurse administers this per protocol.
What to teach before discharge
Teach the patient to watch the puncture site for continued leakage, redness, or warmth, and to seek care if drainage does not stop or if fever develops. Reinforce that some fluid re-accumulation is expected over days to weeks depending on the underlying cause, and that this is different from an acute complication.
Explain the connection between the three key nursing actions and the patient's own self-monitoring: encourage weighing at home and reporting rapid weight gain or increasing abdominal girth, since this tracks fluid reaccumulation the same way the nurse tracked it during the procedure. Advise the patient to report dizziness or light-headedness on standing in the days after a large-volume tap, since delayed hypotension from fluid shifts can occur after discharge. Review any dietary sodium restriction tied to the underlying condition, as this directly affects how quickly ascites returns.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our gastrointestinal practice questions are the closest set to what this page covers.
Common questions
Why must the bladder be emptied before paracentesis?
A full bladder sits close to the needle's path into the peritoneal cavity and raises the risk of accidental bladder puncture. The patient voids, or is catheterised if unable to void, immediately before the procedure begins.
Why is abdominal girth measured before and after paracentesis?
Girth measured at the same landmark, usually the umbilicus, before and after the tap gives an objective record of how much fluid was removed and how the abdomen responded. It is also used going forward to track reaccumulation over time.
Why does blood pressure drop during large-volume paracentesis?
Removing several litres of ascitic fluid quickly causes fluid to shift from the vascular space to refill the peritoneal cavity, reducing effective circulating volume. This can cause hypotension during the procedure or in the hours afterward, which is why vital signs are monitored throughout, not just checked once at the end.
What position is used for paracentesis?
The patient is usually supine with the head of the bed raised 30 to 45 degrees, or turned toward the side where fluid has pooled. This lets gravity draw ascitic fluid toward the puncture site, typically in the lower abdominal quadrant.
Is albumin given after paracentesis?
Albumin replacement is frequently ordered after large-volume paracentesis to help counter the intravascular volume shift caused by rapid fluid removal. The nurse administers it per the ordered protocol and continues monitoring vital signs afterward.