Suprapubic aspiration (SPA) is a sterile procedure that allows for the sampling of uncontaminated urine in patients. It is considered the gold standard for collecting urine for urinalysis in children. In fact, the American Academy of Pediatrics Clinical Practice Guideline published in 2011 for the diagnosis of urinary tract infection (UTI) in children aged 2-24 months recommends that children with an unknown source of fever have a urinalysis be obtained through urinary catheterization or suprapubic aspiration. This is evidence quality A; strong recommendation. Although it is recommended, the SPA is rarely performed. In fact, urinary catheterization is preferred by most healthcare providers since SPA is considered to be an invasive and painful procedure. In addition, this procedure can be performed in children and adults when the bladder outlet is obstructed. Proficiency in suprapubic aspiration is a valuable skill for emergency physicians, pediatricians, and urologists.
The goal of suprapubic aspiration is to cannulate the urinary bladder with a needle for urine collection. An understanding of anatomy is essential to this procedure. In children and neonates, the urinary bladder is an abdominal organ. Later in life, it moves down into the bony pelvis and assumes a retropubic position.
The bladder lies superior and posterior to the pubic symphysis in young children. The anatomic landmarks that must be first identified in young children are the suprapubic crease and the umbilicus. The practitioner must envision an imaginary line from the umbilicus to the suprapubic crease. The cross-point of this imaginary line with suprapubic is the needle insertion site. The cannulating needle will go through the skin, soft tissues, rectus sheath, peritoneum, and wall of the bladder.
In adults, the urinary bladder is retropubic. The major anatomic landmark in adults is the pubic symphysis. It is important to recognize that the bladder dome has peritoneal attachments, and cannulation of this area can cause injury such as perforation of the intraperitoneal bladder. Practitioners must be aware of the major vascular structures such as the common iliac and internal iliac arteries that are lateral to the bladder.
The indications for suprapubic aspiration are as follows:
Suprapubic bladder aspiration is a simple and safe procedure that is usually performed by an emergency physician, pediatrician, or urologist. It is not considered a procedure within the scope of practice of the nursing staff. Since it most commonly involves patients under 2 years of age, it is recommended to have an assistant that is involved in the patient’s care to increase the success rate. In addition, ultrasound guidance is encouraged when available.
For young children: Place the patient spine with an assistant standing at the head of the bed, holding the patient in a frog-leg position.
For adults: Have the patient lay supine.
Complications of suprapubic aspiration are rare, and the utilization of real-time ultrasound guidance decreases their likelihood. Minor complications include mild hematuria and bruising. Potential severe complications of this procedure include bowel wall perforation, cellulitis, gross hematuria, hemoperitoneum, and bleeding. Rarely, a suprapubic abscess has also been reported. If bowel perforation is suspected while performing the procedure, withdraw the needle, and perform the procedure with a fresh needle. Bowel injury from this procedure is usually not clinically significant.
The ability to perform a suprapubic aspiration can be a valuable skill to the clinician, especially in a febrile non-toilet trained patient where the exclusion of UTI is indicated. It allows the clinician to obtain a sterile urine sample when a urinary catheter cannot be placed. Often patients present with fever or sepsis of unknown origin, and obtaining a sterile urine sample is of utmost importance but not feasible without suprapubic aspiration.
In an observational cohort study of urine cultures of 599 children less than 24 months old, the rates of contamination were 1%, 12%, and 26% in urine samples obtained by suprapubic aspiration, catheter specimen, and clean catch urine respectively.
Of note, decreased bladder volume secondary to dehydration has been found to result in the decreased success of suprapubic aspiration. This is an important concept, especially given that some patients who will be candidates for suprapubic aspiration will be febrile and volume-depleted.
After the procedure is performed, the patient’s abdomen should be examined and palpated to evaluate for signs of peritonitis. If the patient is discharged home, the patient should be instructed to return to the emergency department or follow-up with the performing clinician for fever and erythema of the procedure site, severe abdominal pain, as well as inconsolability of a child. Some patients may require nonsteroidal anti-inflammatory drugs (NSAIDs) or acetaminophen for pain control post-procedure.
The interprofessional team caring for patients requiring suprapubic aspiration must have a basic knowledge of this procedure and how to handle the specimen collected. Once the urine sample has been obtained, it must be placed in a sterile collection container and remain sterile for laboratory analysis. Nurses, pharmacists, and physicians should all be aware of the patient’s allergies as this procedure requires local anesthesia as well as possible pain control medications after the procedure. Nurses should be instructed to note and notify the physician if they notice worsening abdominal pain or continued bleeding at the procedure site. Nurses should also perform abdominal exams as they evaluate the patient and alert the physician if they note any severe abdominal tenderness or distention.
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