A femoral dialysis catheter is a large-bore intravenous line inserted into the femoral vein in the upper thigh to allow hemodialysis when other vascular access options are unavailable or impractical. It is typically a temporary, non-tunneled catheter used in urgent or emergency situations, though tunneled versions exist for patients who have exhausted neck and chest vein options. The femoral site carries distinct trade-offs compared to internal jugular or subclavian access, particularly around infection risk, blood recirculation, clot formation, and the practical reality of having a catheter near the groin.
When and Why the Femoral Vein Gets Chosen
Most clinicians prefer the internal jugular vein in the neck for temporary dialysis access, and guidelines generally list the femoral vein as a second-choice site. But the femoral route has genuine advantages in specific situations. It keeps the procedure well away from the lungs, eliminating the risk of pneumothorax that comes with subclavian or jugular insertion. For patients who are critically ill, on mechanical ventilation, or in cardiac arrest, the groin offers a site that does not interfere with chest compressions or airway management. It is also the go-to when the neck and chest veins are thrombosed, stenosed, or otherwise unusable.
Clinical guidelines recommend that acute dialysis catheters be inserted in the internal jugular or femoral vein under ultrasound guidance to minimize complications, and that limiting the duration of use helps prevent catheter-related infections.1PubMed. Acute dialysis catheters The general expectation is that a non-tunneled femoral catheter stays in for days to a few weeks, not months. When longer-term femoral access becomes necessary, tunneled and cuffed versions can be placed, though their patency drops off steeply over time.
Placement and the Role of Ultrasound
Femoral catheter insertion involves puncturing the femoral vein just below the inguinal ligament in the groin. Traditionally, clinicians located the vein using anatomical landmarks, feeling for the femoral artery pulse and inserting the needle just medial to it. This blind technique works but comes with a meaningful error rate. One study found that arterial puncture happened in about 11% of landmark-guided attempts, with hematoma forming in roughly 4%.2PubMed. Ultrasound-guided cannulation of the femoral vein for acute hemodialysis access with silicone catheters Ultrasound guidance cut arterial puncture to under 3% and eliminated hematoma entirely in that same study.
A randomized trial comparing the two approaches found the complication rate dropped from about 18% with the landmark technique to roughly 6% with ultrasound, a statistically significant improvement. Ultrasound also reduced the number of needle passes needed and increased first-attempt success.3PubMed Central. Ultrasound-guided femoral dialysis access placement: a single-center randomized trial The ultrasound probe lets the operator visualize both the vessel anatomy and the needle tip in real time, which limits the chance of accidentally puncturing the back wall of the vein and causing deeper bleeding.4International Medical Case Reports Journal. Ultrasound-Guided Placement of a Hemodialysis Catheter into the Distal Femoral Vein in a Patient with Multiple Catheters: A Case Report
In practice, ultrasound guidance is now considered standard of care for femoral catheter insertion. But the technology does more than improve safety during the initial stick. In patients who have had multiple previous catheters, ultrasound can reveal scarring, stenosis, or anatomical variation that would make a blind attempt dangerous or futile.
Infection Risk Compared to Other Sites
The longstanding teaching in medicine has been that femoral catheters carry a substantially higher infection risk than jugular or subclavian lines. The reasoning is intuitive: the groin is warm, moist, and close to the perineum, all conditions that favor bacterial growth. For years, this belief drove a strong preference for neck-site catheters whenever possible.
The evidence, however, has shifted. A systematic review and meta-analysis of the literature found no significant difference in catheter-related bloodstream infection rates between femoral and subclavian sites. When the femoral site was compared to the internal jugular, older studies did show a higher infection risk for femoral lines, but more recent studies showed no difference. The authors noted that the year of publication significantly influenced the results, with earlier studies driving the apparent excess risk at the femoral site.5PubMed. The risk of catheter-related bloodstream infection with femoral venous catheters as compared to subclavian and internal jugular venous catheters: a systematic review of the literature and meta-analysis The likely explanation is that improvements in insertion technique, dressing protocols, and catheter care have narrowed or eliminated the gap.
That said, not all research agrees. A separate meta-analysis focused on hemodialysis patients found that femoral catheterization still appears to carry a higher risk of catheter-associated infections, attributing this to the humid perineal environment and slower blood flow in the femoral vein that may promote clot formation and bacterial colonization.6PLoS ONE. Risk factors for catheter-associated bloodstream infection in hemodialysis patients: A meta-analysis That analysis cited prior research estimating the risk as nearly eleven times higher with femoral versus jugular placement, though this figure likely reflects older studies. The honest take is that the infection risk at the femoral site is probably higher than at the jugular site in the absence of meticulous care, but the gap is much smaller than clinicians were taught a generation ago, and good dressing and hygiene practices close it further.
Dressings and Infection Prevention
Because the groin environment is inherently prone to moisture and contamination, catheter dressing choices matter more at the femoral site than perhaps anywhere else. A randomized controlled trial compared antimicrobial glucose chlorhexidine dressings to standard sterile dressings in patients on continuous renal replacement therapy. The local infection rate at the catheter insertion site was 40% with standard dressings but only about 16% with the chlorhexidine dressings. Catheter-related bloodstream infection rates were also significantly lower in the chlorhexidine group, at about 6% compared to roughly 14% with standard dressings.7PubMed Central. Antimicrobial Glucose Chlorhexidine Dressings vs. Sterile Dressings in Preventing Catheter-Related Infections During Continuous Renal Replacement Therapy: A Randomized Controlled Trial
The practical message for patients and families is that keeping the groin site dry, clean, and covered with the right dressing is not a minor detail. Chlorhexidine-based dressings appear to offer a genuine protective advantage. Patients with femoral catheters are generally advised to keep the perineal skin dry and to avoid submerging the site. Dressing changes should follow a strict aseptic protocol, and any redness, swelling, warmth, or discharge at the exit site warrants immediate evaluation.
Blood Recirculation and Dialysis Efficiency
One of the most concrete downsides of femoral dialysis catheters is recirculation. During dialysis, blood is drawn out through one lumen of the catheter, cleaned in the dialysis machine, and returned through the other lumen. Recirculation happens when some of the just-cleaned blood gets pulled back into the outflow lumen instead of flowing onward in the bloodstream. The result is that the machine ends up recleaning blood it already cleaned, reducing the overall efficiency of the treatment.
Femoral catheters have substantially higher recirculation rates than jugular or subclavian lines. One study measured recirculation at about 13% in femoral catheters compared to under 1% in internal jugular catheters.8PubMed. Access recirculation in temporary hemodialysis catheters as measured by the saline dilution technique Catheter length is the key variable. Short femoral catheters, those under 20 centimeters, had recirculation rates around 26%, while longer catheters brought it down to about 8%.9PubMed. Access recirculation in temporary hemodialysis catheters as measured by the saline dilution technique
A separate study confirmed the same pattern, finding that 13.5 cm femoral catheters had recirculation rates over 22% on average, while 19.5 cm femoral catheters came in around 13%. The urea reduction ratio, a common measure of dialysis dose, was significantly lower in sessions performed through femoral versus subclavian catheters.10PubMed. Blood recirculation in temporary central catheters for acute hemodialysis This matters most in situations where delivering a full dialysis dose is critical, such as treating poisoning or severe metabolic derangements. For routine acute dialysis in a hospitalized patient, the slightly reduced efficiency is usually acceptable, but it does mean the treatment may need to run longer to achieve the same clearance.
The takeaway for clinicians is that if a femoral catheter is the only option, using a catheter at least 20 cm long substantially improves dialysis delivery. For patients, the practical implication is that a femoral catheter may mean slightly longer dialysis sessions.
Catheter Tip Position and Patency
Where the tip of a femoral dialysis catheter ends up inside the venous system affects how well it works and how long it lasts. A study of tunneled femoral hemodialysis catheters found that a more cephalad (higher up, toward the abdomen) tip position was associated with improved patency.11PubMed. Patency of femoral tunneled hemodialysis catheters and factors predictive of patency failure A tip that reaches into the inferior vena cava sits in a higher-flow area of the venous system, which reduces both clot formation around the tip and recirculation. By contrast, a tip that sits in the common femoral or external iliac vein is in slower, smaller-caliber territory.
This is part of why longer catheters perform better: they have a better chance of reaching the inferior vena cava. In practice, imaging after insertion, whether by fluoroscopy or X-ray, can confirm tip position, and repositioning may be warranted if the tip sits too low.
Thrombosis and Clot Complications
Blood clots are a known hazard of all central venous catheters, but the femoral site carries particular risk because of the slower venous flow in the lower extremities. A prospective observational study of temporary femoral dialysis catheters found that catheter-related thrombosis developed in about 19% of patients over the course of their ICU stay. Most of these clots appeared between days 7 and 10 after insertion. All cases were asymptomatic and did not interfere with catheter function, detected only by routine ultrasound screening.12PubMed Central. Incidence and Characteristics of Catheter-Related Thrombosis in Patients With Temporary Femoral Dialysis Catheters: A Prospective Observational Study
For tunneled femoral catheters left in for longer periods, the numbers are higher. One study reported that about a quarter of patients with tunneled femoral catheters developed deep vein thrombosis on the same side, though catheter use could continue with anticoagulation therapy.13PubMed. Outcomes of tunneled femoral hemodialysis catheters: comparison with internal jugular vein catheters The fact that many of these clots are silent, causing no symptoms, means they can go unnoticed without surveillance imaging. Whether routine screening for catheter-related thrombosis should be standard practice is an open question, but clinicians generally maintain a low threshold for imaging if a patient develops leg swelling, pain, or catheter malfunction.
Tunneled Femoral Catheters for Longer Use
When a patient has no usable veins in the neck or chest, a tunneled femoral catheter may be the only remaining option for ongoing hemodialysis. Unlike non-tunneled catheters that enter the vein directly through the skin, tunneled catheters are threaded under the skin for several centimeters before entering the vein, and they have a Dacron cuff that promotes tissue ingrowth to anchor the catheter and create a barrier against infection.
However, the track record of tunneled femoral catheters is humbling. In one series, primary catheter patency, meaning the catheter worked continuously without any intervention, was 81% at 30 days but dropped to 29% at 60 days and just 12.5% at 180 days. About 14% were removed for infection and a third for loss of blood flow.14PubMed Central. Tunneled Femoral Vein Catheterization for Long-term Hemodialysis – Experience from a Tertiary Care Center These numbers make clear that a tunneled femoral catheter is a bridge, not a destination. The goal should always be to transition to a more durable form of access, whether an arteriovenous fistula, a graft, or a peritoneal dialysis catheter, as soon as the clinical situation allows.
Venous Stenosis from Prolonged Use
Beyond infection and thrombosis, prolonged femoral catheterization can cause lasting damage to the vein itself. A study found that patients who had femoral catheters in place for more than four weeks developed stenosis, or narrowing, of the femoral and iliac veins. No stenosis was seen in patients with shorter catheter dwell times.15Nephrology Dialysis Transplantation. Femoral and iliac vein stenoses after prolonged femoral vein catheter insertion Venous stenosis can compromise future vascular access options, reduce blood return from the leg, and in severe cases lead to chronic leg swelling. This finding reinforces the principle that femoral catheter dwell time should be kept as short as possible.
Lock Solutions Between Dialysis Sessions
When a dialysis catheter is not in active use, the lumens are filled with a “lock solution” to prevent clotting and bacterial colonization. The two most common options are heparin, a blood thinner, and trisodium citrate, which works as both an anticoagulant and an antimicrobial agent.
A multicenter randomized trial compared 4% trisodium citrate to heparin as lock solutions for non-tunneled hemodialysis catheters, including those placed in the femoral vein. Event-free catheter survival was not significantly different between the two groups, at a median of about 7 days for citrate versus 5 days for heparin. Rates of catheter thrombosis, bloodstream infection, and adverse events were also statistically similar.16PubMed Central. Trisodium citrate 4% versus heparin as a catheter lock for non-tunneled hemodialysis catheters in critically ill patients: a multicenter, randomized clinical trial A systematic review of the broader literature on lock solutions for non-tunneled hemodialysis catheters found the same general pattern: citrate and heparin perform similarly, with some data suggesting fewer infections with citrate but the differences not consistently reaching statistical significance.17PubMed Central. Systematic review of locking solutions for non-tunneled hemodialysis catheters
For patients at higher risk of bleeding, citrate offers a theoretical advantage because it works locally within the catheter lumen without the systemic blood-thinning effects heparin can sometimes cause. In practice, the choice often comes down to institutional preference.
Moving Around with a Femoral Catheter
One of the most common concerns about femoral catheters is whether the patient has to stay in bed. A catheter anchored in the groin creates an understandable worry that bending the hip, standing, or walking could dislodge the line, kink it, or cause bleeding. For years, many ICUs treated a femoral catheter as an automatic reason to keep the patient on bed rest.
This turns out to be overly cautious. A prospective observational study examined 92 femoral catheters, 27 of which were dialysis catheters, in ICU patients who underwent physical therapy sessions that included sitting on the edge of the bed, standing, transferring to chairs, and walking. Across 210 sessions involving 630 individual mobility activities, there were zero catheter-related mechanical or thrombotic complications.18PubMed Central. Safety and Efficacy of Mobility Interventions in Patients with Femoral Catheters in the ICU: A Prospective Observational Study
A separate initiative developed a formal protocol for mobilizing ICU patients with femoral catheters. Among 28 patients with femoral arterial or hemodialysis catheters, mobility encounters ranged from bedside exercises to ambulating down the hallway, with no adverse events.19Journal of Acute Care Physical Therapy. Removing Rehabilitation Barriers to Early Mobility in the Intensive Care Unit for Adult Patients With Femoral Arterial and Hemodialysis Catheters This is a meaningful finding because prolonged bed rest in the ICU leads to rapid muscle wasting, blood clots in the legs, and longer hospital stays. Knowing that patients with femoral catheters can safely participate in physical therapy changes the calculus for keeping them active during their hospitalization.
Vascular Injury and Rare Complications
The most common acute complications during femoral catheter insertion are arterial puncture, groin hematoma, and local bleeding, all of which are usually manageable with direct pressure. Rarely, the procedure can cause more serious injuries. One case report documented perforation of the femoral vein leading to a prevesical hematoma, a collection of blood in the space in front of the bladder.20PubMed. Emergency femoral hemodialysis catheter placement complicated by prevesical hematoma This kind of complication is uncommon enough to be reported as an individual case, but it illustrates why operators should use ultrasound guidance and confirm catheter placement before starting dialysis.
In patients on blood thinners, or those with coagulopathy from liver disease or other causes, even a minor arterial puncture during insertion can escalate into significant bleeding. Clinicians typically hold anticoagulation when feasible before the procedure and apply prolonged pressure after the catheter is in place.
Femoral Catheters in Children
Children needing emergent hemodialysis present a unique challenge because their smaller veins make catheter insertion technically more difficult regardless of the site. The femoral vein is often preferred in pediatric patients because the anatomy is relatively consistent and the groin offers more space for the operator to work compared to the small neck of an infant or toddler. One pediatric study reported 317 femoral catheter insertions in children requiring hemodialysis.21PubMed. Central venous catheters as a vascular access modality for pediatric hemodialysis The same principles apply regarding ultrasound guidance, catheter length, dwell time, and dressing care, but pediatric patients may require more creative solutions for securing the catheter and preventing accidental dislodgement, especially in younger children who do not understand why they cannot touch or pull at the line.
Catheter Removal and Aftercare
Removing a femoral dialysis catheter is generally straightforward but not without risk, particularly for tunneled catheters. The Dacron cuff of a tunneled catheter forms tissue adhesions that require dissection before the catheter can be pulled. Bleeding from the tunnel tract and, less commonly, air embolism are the main concerns during removal. One retrospective review of a suture-over-catheter-tract technique for tunneled catheter removal, applied primarily to jugular catheters, found a low complication rate of under 4% across 79 consecutive removals.22The Journal of Vascular Access. Over-catheter tract suture to prevent bleeding and air embolism after tunnelled catheter removal At the femoral site, air embolism is less of a concern than at the jugular site because the groin is below heart level, but post-removal bleeding is still a real risk, and manual pressure is typically held for at least ten to fifteen minutes, sometimes longer in patients on anticoagulants.
After a femoral catheter is removed, the site needs to be monitored for hematoma, infection, and delayed bleeding. Patients are generally asked to keep the leg straight and avoid heavy exertion for several hours. Ultrasound surveillance for residual deep vein thrombosis is sometimes performed, especially if the catheter was in place for more than a week.