What are the evaluation steps, surgical procedure, risks, and recovery process for living donor liver donation?

Living Liver Donation: A Comprehensive Overview

Living liver donation involves removing a portion of a healthy person's liver (typically the right lobe for adult recipients or left lateral segment for children) through major abdominal surgery, carrying a mortality risk of approximately 0.18% and a complication rate affecting roughly one-third of donors. 1

Donor Evaluation Process

The evaluation follows a rigorous, multi-stage protocol designed to ensure donor safety and graft adequacy:

Initial Screening Phase

• Relationship verification: Most programs require biological or emotional relationship to recipient 2
• Age assessment: Typically 18-60 years (note: higher age increases complication risk) 3, 4
• ABO blood type compatibility
• Basic medical history and physical examination to exclude significant comorbidities

Advanced Imaging and Anatomical Assessment

Contrast-enhanced CT scan is the critical early step, identifying approximately 64% of unsuitable donors and, when combined with basic testing, excludes 87% of ineligible candidates 4. This imaging evaluates:

• Liver volume: Donor remnant must be ≥30% of pre-donation volume; graft must be ≥0.8% of recipient body weight 1, 5
• Vascular anatomy: Hepatic artery, portal vein, and hepatic vein mapping (anatomic variants present in up to 50% of population) 6
• Biliary anatomy: Bile duct configuration (3-4mm diameter structures require precise mapping) 1
• Hepatic steatosis: Significant fatty liver is a common exclusion criterion 3, 4

Medical Workup

• Comprehensive laboratory studies including liver function tests, coagulation profile
• Screening for infectious diseases (HBV, HCV, HIV, CMV, EBV)
• Cardiopulmonary assessment
• Procoagulant condition screening 5
• Age-appropriate cancer screening

Psychosocial Evaluation

Mandatory assessment to evaluate:

• Voluntary nature of donation without coercion
• Understanding of risks and outcomes
• Psychological readiness
• Social support systems 7, 2

The Surgical Procedure

For Adult Recipients (Right Lobe Donation)

• Segments removed: V-VIII (right hepatectomy)
• Structures isolated: Right hepatic artery, right portal vein, right bile duct, right hepatic vein
• Operation time: Approximately 6-7 hours 8
• Blood loss: Average 300ml (range 100-500ml) 8
• Technical complexity: Meticulous dissection required; some grafts include middle hepatic vein (increases donor risk) 1

For Pediatric Recipients (Left Lateral Segment)

• Segments removed: II-III
• Lower complication rates than right lobe donation
• Faster recovery: More rapid normalization of bilirubin and coagulation parameters 1

Risks and Complications

Mortality Risk

The donor mortality rate is 0.18% according to European registry data, though this figure is considered under-reported 1. The reality that a healthy individual may die from donation has significantly impacted acceptance in Western countries.

Morbidity Rates

• Overall complication rate: 38% for right lobe donors 1
• 11-20% complication rate across all donor types 7, 2
• Right lobe donation carries significantly higher risk than left lobe or left lateral segment donation 1

Specific Complications (by Clavien-Dindo Classification)

Most Common (Type I-II):

• Biliary fistula/leak: Most frequent complication, usually managed conservatively 1
• Wound complications
• Transient liver dysfunction

Moderate (Type IIIa-IIIb):

• Bile leak requiring intervention (occurred in 1/74 donors in one series) 8
• Hemorrhage requiring reoperation
• Need for rehospitalization (affects some donors) 1

Severe (Type IV-V):

• Liver failure
• Death (0.18% risk) 1

Laboratory Changes Post-Donation

• Peak ALT: Average 229.5 U/L, normalizes in ~13 days 8
• Peak bilirubin: Average 78.7 μmol/L, normalizes in ~9 days 8
• Right lobe donors show slower normalization than left lobe donors 1

Recovery Process

Hospital Stay

• Average duration: 14 days (range 7-28 days) 8
• Shorter for left lateral segment donors

Return to Normal Function

• Liver regeneration: Begins immediately post-operatively
• Return to work: Most donors resume normal activities and work within weeks to months 8
• Long-term outcomes: The vast majority of donors return to completely normal life 7, 2

Follow-up Requirements

• Close postoperative monitoring for complications
• Serial laboratory testing to track liver function recovery
• Long-term surveillance (though protocols vary by center)

Critical Safety Considerations

Key factors that increase donor risk and should prompt careful consideration or exclusion:

1. Right lobe donation vs. left lobe (higher complication rate: 23.3% vs. 11.5%) 7
2. Advanced donor age (significant risk factor for complications ≥Grade II) 4
3. Obesity or hepatic steatosis (common exclusion criteria) 3, 4
4. Small remnant liver volume (<30% of original) 5
5. Complex vascular or biliary anatomy 6

Common Pitfalls to Avoid

• Inadequate volumetric assessment: Errors occur in up to 10% of cases, potentially endangering donor safety 6
• Insufficient anatomical mapping: Missing vascular or biliary variants (present in 50% of population) can lead to intraoperative complications 6
• Rushing evaluation: Approximately 43-68% of potential donors are ultimately declined; thorough evaluation prevents unnecessary risk 3, 4
• Underestimating psychosocial factors: Coercion or inadequate understanding of risks compromises informed consent 7

The decision to proceed with living donation requires balancing the recipient's urgent need against the donor's safety, with donor welfare always taking absolute priority. Programs should concentrate experience in high-volume centers to minimize risks and optimize outcomes for all stakeholders 5.