How to Hang Albumin and Start an Infusion

Hanging albumin follows the same general steps as any intravenous infusion, but the product has a few quirks that trip people up, especially the first time. You select the correct concentration (5% or 25%), inspect the bottle or bag, use an appropriate IV administration set, prime the line, connect to an established IV access site, and set the rate based on the clinical situation and the patient’s tolerance. The details within each of those steps matter more than usual because albumin is a human blood product with specific compatibility rules, and mistakes with dilution have caused fatal outcomes.

Know Which Concentration You Are Giving

Albumin comes in two standard concentrations, and they are not interchangeable for the same purpose. The 5% solution is roughly isotonic with plasma and is used primarily as a volume expander. The 25% solution is hyperoncotic, meaning it pulls fluid from the interstitial space into the bloodstream. In a controlled crossover trial, 20% albumin produced plasma volume expansion equal to about twice the infused volume, while roughly a third of a 5% albumin infusion leaked out of the plasma quickly because its oncotic pressure was actually lower than the volunteers’ own plasma oncotic pressure.¹ That difference in behavior drives everything from the infusion rate to which patients receive which product.

The 5% solution typically comes in 250 mL or 500 mL containers. The 25% solution usually comes in 50 mL or 100 mL vials. Before you do anything else, verify the order matches the concentration and volume you have in hand. A mix-up between 5% and 25% changes the entire fluid dynamic of what you are about to deliver.

Inspecting and Preparing the Product

Albumin is a clear, slightly viscous, amber-colored fluid derived from pooled human plasma. Before hanging it, hold the container up to a light source and look for turbidity, particulate matter, or any sign of discoloration. If the solution looks cloudy or has floating particles, do not use it. Also check the expiration date and that the vacuum seal (on glass bottles) or tamper evidence (on bags) is intact.

Albumin does not require refrigeration before use and is typically stored at room temperature. If it has been refrigerated, you can let it warm to room temperature before infusing, which is more comfortable for the patient and reduces the chance of a chill reaction. Do not warm it in a microwave or by placing it in boiling water. Simply letting it sit at room temperature for 20 to 30 minutes is enough.

Because albumin is derived from human plasma, the manufacturing process includes rigorous donor screening, plasma testing, and pathogen inactivation steps such as cold-ethanol fractionation and pasteurization at 60°C for 10 hours.² This makes the modern product extremely safe from a transmissible-infection standpoint, but it does not eliminate the risk of allergic reactions, which we will cover below.

Setting Up the IV Tubing

Albumin can be administered through a standard IV administration set. If your facility’s albumin comes in a glass bottle, you will need a vented set (or a separate venting spike) to allow air into the bottle so the fluid can flow. If the product is in a flexible plastic bag, a non-vented set works fine because the bag collapses as the fluid runs out.

Whether or not to use an in-line filter is a question that varies by facility policy. Many hospital protocols call for a standard 15-micron blood filter or a 0.2-micron filter, while others allow albumin to run through a standard set without a dedicated filter. Follow your institution’s guidelines on this point. Whichever tubing you use, prime it fully before connecting to the patient’s IV catheter. Let the albumin solution fill the drip chamber to about halfway, open the roller clamp, and allow fluid to push all the air out through the distal end of the tubing.

A practical note: albumin tends to foam when agitated, especially the 25% concentration. Swirl the bottle gently rather than shaking it. If you see excessive foam in the drip chamber after spiking, you can tap the chamber or adjust the clamp briefly to let it settle before you start the infusion.

Connecting to the Patient and Starting the Infusion

You can infuse albumin through a peripheral IV or a central venous catheter. The gauge of the peripheral catheter matters less than with packed red blood cells, but an 18- or 20-gauge catheter is commonly used. Before connecting, verify the site is patent by flushing with normal saline. Scrub the hub of the catheter with an alcohol swab, connect the primed tubing, and open the clamp.

For the first 15 minutes, start slowly. Many protocols suggest beginning at about 1 to 2 mL per minute for 5% albumin and even more slowly for 25% albumin (often starting at 0.2 to 0.5 mL per minute). This cautious start is your window to catch early signs of an allergic or anaphylactic reaction. If the patient tolerates the initial period without symptoms, you can increase to the ordered rate.

After that initial observation period, typical rates vary by concentration and clinical scenario. For 5% albumin, many institutions allow infusion rates up to 5 mL per minute in patients who are not at risk for fluid overload. For 25% albumin, a rate of 2 to 3 mL per minute is common, though in patients with heart failure or compromised cardiac function, you may slow considerably. A randomized trial compared rapid infusion of 5% albumin over 30 minutes against slow infusion over 180 minutes in postoperative patients and found that the total plasma volume expansion at three hours was essentially the same regardless of speed.³ So going faster does not give you more lasting volume expansion. It does, however, increase the risk of circulatory overload in vulnerable patients, which is why the rate always needs to be individualized.

The Sterile Water Rule You Cannot Afford to Forget

If the order calls for diluting 25% albumin, the diluent matters enormously. Normal saline (0.9% sodium chloride) or 5% dextrose in water are acceptable. Sterile water for injection is not. When 25% albumin is diluted with sterile water alone, the resulting solution becomes severely hypotonic. Infusing a hypotonic albumin solution can destroy red blood cells in the bloodstream, a process called hemolysis. A CDC investigation documented 10 episodes of hemolysis in patients who received 25% albumin diluted with sterile water, including one death.⁴ A separate case report detailed hemolysis with acute renal failure from the same dilution error.⁵

This is the single most dangerous mistake you can make when hanging albumin, and it has happened enough times to generate its own body of literature. The fix is simple: if you need to dilute 25% albumin, reach for normal saline. If your facility stocks sterile water near the albumin, that is a systems issue worth flagging to pharmacy.

Other Compatibility Concerns

Albumin should generally be infused through a dedicated line. Do not piggyback it into a line running other medications unless your pharmacy has confirmed compatibility. An in vitro study evaluating 25 common IV medications found that 20% albumin was incompatible with lipid emulsion, which is relevant if the patient is also receiving parenteral nutrition through the same line or a shared lumen.⁶ If you have no choice but to use the same line, flush thoroughly with normal saline between the two products.

Albumin should not be mixed with whole blood or packed red blood cells in the same container. It is also generally not added to amino acid solutions or anything containing alcohol. When in doubt, run it alone. If the patient has a multi-lumen central line, use a separate port for the albumin.

Monitoring During and After the Infusion

During those first 15 minutes at the slow initial rate, stay with the patient or check frequently. Watch for signs of an allergic reaction: hives, flushing, itching, chest tightness, wheezing, a drop in blood pressure, or shortness of breath. Albumin reactions can range from mild skin symptoms to full anaphylaxis.⁷ If any of these occur, stop the infusion, keep the line open with normal saline, and notify the physician immediately.

An interesting wrinkle: some patients who receive albumin repeatedly, such as those on therapeutic plasma exchange, can develop a sensitivity to one manufacturer’s albumin but not another. Two case reports described patients whose symptoms resolved completely when they were switched to albumin from a different manufacturer, suggesting the reaction was tied to something in that particular formulation rather than the albumin protein itself.⁸ If a patient has a documented albumin reaction, it is worth checking whether a different brand is available before abandoning albumin altogether.

Beyond allergic reactions, the main risk during albumin infusion is circulatory overload, especially with the hyperoncotic 25% solution. Because it draws fluid into the vascular space, it can push patients with marginal cardiac function into pulmonary edema. Monitor heart rate, blood pressure, respiratory rate, and oxygen saturation at regular intervals throughout the infusion. If the patient develops new crackles on lung auscultation, a rising heart rate, or worsening shortness of breath, slow or stop the infusion and reassess.

Why Albumin Is Being Given in the First Place

Understanding the clinical reason behind the order helps you anticipate what to watch for. Albumin contributes to the oncotic pressure that keeps fluid in the bloodstream rather than leaking into surrounding tissues.⁹ When albumin levels are low or when the body needs rapid volume expansion, IV albumin can restore that balance.

The most well-established indications involve liver disease. Current guidelines conditionally recommend albumin for patients with cirrhosis undergoing large-volume paracentesis (removal of more than 5 liters of abdominal fluid) or for patients with spontaneous bacterial peritonitis.¹⁰ In one randomized trial, patients who had daily 5-liter paracenteses without receiving albumin developed kidney injury about a fifth of the time, while no patients receiving albumin did.¹¹ The standard dosing for paracentesis has traditionally been 6 to 8 grams of albumin per liter of fluid removed, though a recent systematic review found that lower doses in the range of 2 to 6.5 grams per liter appeared equally effective and safe in the available evidence, which the authors noted was limited by small study sizes.¹²

Outside of liver disease, albumin is sometimes used for resuscitation in critically ill patients, though this is an area where the evidence is less decisive. The landmark SAFE trial, which enrolled nearly 7,000 ICU patients and randomized them to receive either 4% albumin or normal saline for fluid resuscitation, found essentially identical 28-day mortality between the two groups.¹³ Albumin was not harmful, but it was not superior either, at least for that broad population. Subgroup analyses from that trial and later studies have suggested possible benefits in specific populations such as patients with sepsis, but the global picture is that albumin is expensive and does not outperform saline for general ICU resuscitation.

Practical Tips That Save You Trouble

A few pieces of practical wisdom tend to come from experience rather than textbooks. First, albumin bottles can be difficult to spike because the glass ones have a rubber stopper rather than the soft port you are used to with plastic bags. Push the spike straight down with steady pressure; angling it can cause the spike to slip or the stopper to fragment. Second, 25% albumin is noticeably viscous. If it seems to be dripping too slowly through standard tubing, check that the vent is open (on glass bottles) and that the clamp is fully released. You can raise the IV pole higher to increase the gravity-driven flow, or use a pump if one is available and your facility allows it for albumin.

Third, document what you give with the same attention you would give to a blood transfusion. Record the lot number and the manufacturer, the start and stop times, the total volume infused, the rate, and your assessment findings during and after the infusion. This documentation matters for traceability and becomes critical if the patient has an adverse reaction.

Fourth, once you puncture the stopper or open the bag, use the albumin promptly. Most manufacturer guidelines say to use the opened container within four hours and to discard any unused portion. Albumin does not contain preservatives, and contamination risk increases with time.

A Product With a Long History

Concentrated 25% human albumin solution was originally developed during the Second World War as a compact and stable blood substitute for treating traumatic shock, burns, and hemorrhage on the battlefield.¹⁴ The small volume of a 25% solution made it ideal for military field conditions where refrigeration was unavailable and transport space was limited. After the war, albumin moved into civilian hospitals and gradually became one of the most commonly ordered colloid solutions in critical care. Its use has waxed and waned over the decades as evidence clarified which patients actually benefit and which can do just as well with cheaper crystalloid fluids. That history is part of why you will encounter strong opinions about when albumin should and should not be used. The product itself has not changed dramatically since those early days, but our understanding of who needs it has sharpened considerably.