What are the recommended dosing regimens for 5% and 25% albumin infusions in adults and children?

Albumin Infusion Dosing

For adults, use 25% albumin at 50-75 g daily for hypoproteinemia, 1.5 g/kg at diagnosis and 1 g/kg on day 3 for spontaneous bacterial peritonitis, and 6-8 g per liter of ascites removed for large volume paracentesis (≥5 L); for children, use 25 g daily for hypoproteinemia and 1 g/kg for neonatal hemolytic disease, while avoiding bolus administration in critically ill children with sepsis or severe febrile illness due to increased mortality risk. 1

Adult Dosing Regimens

Hypovolemic Shock

• 5% albumin is preferred for typical volume deficits in dehydrated patients
• 25% albumin with crystalloids offers advantages in oncotic deficits or delayed shock treatment
• Maximum total dose: 2 g/kg body weight in absence of active bleeding
• 25% albumin expands plasma volume by 3-4 times the infused volume by drawing interstitial fluid 1

Hypoproteinemia

• Standard dose: 50-75 g daily for adults
• Target plasma albumin: 2.5 ± 0.5 g/dL (plasma oncotic pressure 20 mmHg)
• Infusion rate should not exceed 2 mL/min to prevent circulatory overload and pulmonary edema 1

Critical caveat: Patients with severe hypoproteinemia who continue losing albumin may require larger quantities, but chronic conditions (nephrosis, cirrhosis, malabsorption) do not warrant albumin as it provides no long-term benefit 1

Spontaneous Bacterial Peritonitis (High-Risk)

• 1.5 g/kg at diagnosis and 1 g/kg on day 3
• Infuse over 6 hours per dose 2

Important warning: A 2023 RCT found that standard dose albumin (1.5 g/kg + 1 g/kg) infused over 6 hours caused symptomatic circulatory overload in 100% of patients in one arm versus only 6.25% with reduced dose (0.75 g/kg + 0.5 g/kg), though outcomes were similar 2. Consider slower infusion rates or reduced doses in populations at risk for volume overload.

Large Volume Paracentesis

• 6-8 g albumin per liter of ascites removed when ≥5 L removed 3
• Practical dosing: 25 g for 5-6 L, 50 g for 7-10 L, 75 g for >10 L 3
• A 2024 regression discontinuity study confirmed the 5 L threshold reduces creatinine by 0.046 mg/dL/day and increases sodium by 0.35 mEq/L/day 4

Emerging concern: The same study showed worsening renal/sodium parameters after draining just 3 L, suggesting the 3-5 L range may warrant further evaluation for albumin use 4

Burns (Beyond 24 Hours)

• Target plasma albumin: 2.5 ± 0.5 g/dL
• Use 25% albumin to maintain plasma colloid osmotic pressure
• Duration determined by protein loss from burned areas and urine 1

Cardiopulmonary Bypass

• Adjust pump prime to achieve:
  • Hematocrit: 20%
  • Plasma albumin: 2.5 g/dL 1

Neonatal Hemolytic Disease

• 1 g/kg body weight given 1 hour prior to exchange transfusion to bind free bilirubin 1
• Exercise caution in hypervolemic infants

Pediatric Dosing Regimens

Hypoproteinemia

• Standard dose: 25 g daily for children
• Patients with severe hypoproteinemia may require larger quantities 1

Critical Illness - AVOID BOLUS ADMINISTRATION

The most important pediatric consideration: A large, well-designed RCT (FEAST trial, N=3,141) in critically ill children with severe febrile illness (60% with malaria) was terminated early due to excess mortality with albumin boluses 5

• 5% albumin bolus increased mortality: RR 1.45 (95% CI 1.10-1.92) at 48 hours
• Similar excess mortality persisted at 28 days: RR 1.40 (95% CI 1.08-1.80)
• Higher rates of respiratory dysfunction, neurologic dysfunction, hyperchloremic acidosis, and hemoglobin reduction occurred with albumin boluses 5

This finding fundamentally contradicts adult practice and represents a critical safety concern in pediatric critical care.

Concentration Selection: 5% vs 25%

25% albumin is preferred in most situations because:

• It is hyperoncotic and expands plasma volume by 3-4 times the infused volume 1
• Delivers 5 times less sodium per gram of albumin compared to 5% solution 6
• More efficient for oncotic support 6

5% albumin is preferred when:

• Patient is dehydrated (needs concurrent volume expansion) 1
• Typical volume deficits in hypovolemic shock 1
• Lower viscosity allows easier infusion 7

Research shows plasma volume expansion depends on the amount of albumin given and the plasma volume deficit, not the concentration administered 7. Both concentrations produce approximately 11 mL plasma expansion per gram of retained albumin 7.

Administration Considerations

• Always administer intravenously
• May be given undiluted or diluted in 0.9% NaCl or 5% dextrose
• For sodium restriction: use undiluted or dilute only in sodium-free solutions (5% dextrose)
• Use only 16-gauge needles for vials ≥20 mL
• Inspect for particulate matter before administration 1

When NOT to Use Albumin

The 2024 International Collaboration for Transfusion Medicine Guidelines found no mortality benefit for albumin in critically ill adults across multiple conditions 5. Specifically avoid in:

• Chronic nephrosis (promptly excreted with no benefit) 1
• Chronic cirrhosis, malabsorption, protein-losing enteropathies as nutritional source 1
• Routine fluid resuscitation in sepsis (crystalloids remain first-line per Surviving Sepsis Campaign 2021) 5
• Pediatric critical illness with sepsis/severe febrile illness (increased mortality risk) 5
• Simple hypoalbuminemia without clinical indication 8, 9

A 2003 multi-institutional study found albumin was prescribed inappropriately 57.8% of the time in adults, with 100% inappropriate use for intradialytic hypotension, low serum albumin alone, and ARDS 8.