Push-pull sampling through peripheral IVCs gains traction in dogs
Bottom line
Push-pull blood sampling through peripheral IV catheters is getting fresh attention in veterinary education, with VETgirl highlighting the technique for dogs as a practical way to reduce repeated venipuncture in hospitalized patients. The podcast’s framing adds an important detail: this is specifically a no-blood-waste approach, aimed not just at reducing needle sticks but also at avoiding the cumulative blood loss that comes with traditional discard sampling through catheters — a point that may matter most in small or anemic patients. The underlying evidence base has strengthened: a recent prospective JAVMA study in 70 hospitalized dogs found that the push-pull method using a peripheral IV catheter was an accurate option for serial blood sampling, while earlier work also suggested many CBC and serum biochemistry values collected through peripheral catheters are clinically comparable to direct venipuncture in dogs. A separate 2026 Veterinary Vertex episode discussing the same JAVMA paper framed the method as a way to reduce needle sticks without sacrificing most day-to-day lab utility. (islandscholar.ca)
Why it matters: For veterinary professionals, this is less about a brand-new procedure than a more evidence-backed workflow for inpatient care. If a dog already has a well-functioning peripheral catheter, push-pull sampling could help teams limit patient stress, preserve venous access, reduce staff time tied to repeat blood draws, and avoid unnecessary blood waste during serial monitoring. The caveat is that implementation still depends on case selection, catheter quality, and test interpretation: both VETgirl and commentary tied to the 2026 discussion emphasized the need to think about dilution or contamination from IV fluids and medications, along with familiar preanalytic issues like hemolysis, clotting, turbidity, and smear quality. Clinicians were also urged to stay cautious with analytes where small shifts matter, such as sodium:potassium interpretation in suspected hypoadrenocorticism. (podcasts.apple.com)
What to watch: Expect more CE content and hospital protocol discussions around when no-waste push-pull sampling is appropriate, how to standardize it around active infusions and medications, and where direct venipuncture should still remain the default. (podcasts.apple.com)
VETgirl’s coverage of push-pull blood sampling through peripheral IV catheters in dogs lands at a moment when the technique is moving from “interesting workaround” toward evidence-supported inpatient practice. The core question is simple: can teams use an existing peripheral catheter for serial blood sampling instead of repeatedly sticking hospitalized dogs? VETgirl’s discussion sharpens that question further by focusing on a zero-blood-waste version of the technique — an important distinction in patients needing repeated CBCs, chemistry checks, or glucose monitoring, especially when cumulative discard volumes could matter in small or anemic dogs. Recent research suggests that, in many cases, the answer is yes. (islandscholar.ca)
The idea isn’t entirely new. Earlier veterinary studies examined blood collection through indwelling catheters, including work on venous blood gas sampling and comparisons between jugular venipuncture and peripheral catheter-derived CBC and chemistry samples. Those studies generally found that many values were close enough to be clinically useful, while also underscoring that not every analyte or clinical scenario is interchangeable. In other words, the profession has been building toward this conversation for years, and the latest JAVMA paper adds prospective data from hospitalized dogs rather than idealized lab conditions alone. (pubmed.ncbi.nlm.nih.gov)
The new study highlighted in recent podcast coverage was a prospective study of 70 hospitalized dogs that compared samples collected by venipuncture with samples obtained by a push-pull technique through a peripheral IV catheter. Search results and secondary coverage describe the study’s main takeaway as favorable: the method was an accurate option for serial blood sampling in hospitalized dogs. VETgirl’s summary is useful here because it frames the study not just as a convenience play, but as a test of whether short peripheral IV catheters can “pull double duty” for blood collection without the usual blood discard step. The Apple Podcasts description for a May 5, 2026 episode from Veterinary Vertex, which discussed the paper with Dr. Bryan Welch, says the episode reviewed samples collected both right after catheter placement and after at least 24 hours of continuous IV fluids and medications, and emphasized the distinction between statistical significance and clinically meaningful differences. (islandscholar.ca)
That practical framing matters. In busy ER and ICU settings, repeated venipuncture can increase patient stress, consume technician and doctor time, and make venous preservation harder in dogs that already need ongoing access for fluids, medications, or monitoring. VETgirl also points to another operational issue that often gets less attention: traditional catheter sampling usually requires withdrawing and discarding enough blood to clear dilution from the line before collecting the actual sample, and that blood loss can accumulate over a hospitalization. Prior research in the Journal of Veterinary Internal Medicine similarly found few clinically important differences for most machine-measured serum biochemistry and CBC analytes between direct venipuncture and peripheral catheter samples, whether the catheter was freshly placed or had been in place during hospitalization for about a day. (pmc.ncbi.nlm.nih.gov)
Industry and expert reaction, at least from veterinary education and journal-adjacent channels, has been practical rather than promotional. Both VETgirl and the Veterinary Vertex discussion present the method as a way to reduce venipuncture while still warning clinicians about real-world concerns. If pulling blood through a short peripheral catheter gives clinicians pause, that hesitation is part of the point: the same catheter may also be used for IV fluids and medications, raising the possibility of dilution or contamination that could alter lab interpretation. Add in familiar preanalytic problems — hemolysis, clot formation, turbidity, and smear changes — and the message becomes clear: this is a useful technique, not a free pass. The Veterinary Vertex episode notes one area of caution in particular, sodium:potassium ratio interpretation for suspected hypoadrenocorticism, which is a useful reminder that “accurate enough for many serial checks” is not the same as “interchangeable for every diagnostic question.” (podcasts.apple.com)
Why it matters: For veterinary professionals, the significance is operational as much as clinical. A validated push-pull protocol could support lower-stress sampling for dogs, improve workflow efficiency for technicians and ECC teams, preserve peripheral veins in patients needing repeated monitoring, and reduce avoidable blood waste from discard sampling. That may also align with a better experience for the pet parent, who often sees every additional needle stick as another sign of patient burden. Still, hospitals will need clear SOPs around which catheters qualify, how much flush and dead-space management is acceptable, when to avoid sampling after certain infusions or medications, and which tests should still trigger direct venipuncture. (pmc.ncbi.nlm.nih.gov)
There’s also an education-workforce angle. Techniques like this can improve care only if the entire veterinary team is trained to perform them consistently and interpret results appropriately. That makes CE coverage from outlets like VETgirl relevant beyond awareness alone: the value is in translating published evidence into repeatable hospital-floor practice, while helping teams understand where sample “shenanigans” can create false abnormalities if collection and handling are sloppy. Inference from the available sources suggests that adoption will likely be strongest in emergency and specialty settings first, where serial sampling demands are highest and workflow gains are easiest to see. (islandscholar.ca)
What to watch: The next step is likely protocolization rather than discovery: more CE discussions, hospital policy updates, and possibly follow-on studies clarifying which analytes, infusion conditions, catheter dwell times, and patient populations are best suited to no-waste push-pull sampling in dogs — and where direct venipuncture should remain the standard. (islandscholar.ca)