Can an 81-year-old woman with chronic kidney disease stage 3 (eGFR ≈ 28 mL/min/1.73 m²) and mild anemia be cleared for surgery?

Surgical Clearance Decision

Yes, this patient can be cleared for surgery, but requires specific perioperative optimization and heightened monitoring due to her CKD stage 3b (eGFR 28) and borderline anemia status.

Key Laboratory Assessment

The patient's labs reveal:

• eGFR: 28 mL/min/1.73 m² - Stable CKD stage 3b (unchanged from 8 months ago, indicating no acute deterioration)
• Hemoglobin: 12.8 g/dL - Just above the WHO anemia threshold for women (<12 g/dL), but below optimal surgical levels
• Electrolytes: Well-controlled (K+ 4.4, Na+ 141, mild metabolic acidosis with CO2 21)
• Hematologic parameters: Normal except mild macrocytosis (MCV 99)
• No acute kidney injury - Creatinine stable at baseline

Risk Stratification

The patient faces elevated perioperative risk based on recent evidence showing that eGFR <30 mL/min/1.73 m² significantly increases complications 1. Specifically, patients with moderate to severe kidney loss (eGFR 30-60) have 1.5-fold increased odds of reoperation and readmission, while those with severe loss (eGFR 15-30) face nearly 2-fold increased risk of complications 1. Your patient sits at the threshold of these high-risk categories.

CKD is an independent risk factor for postoperative acute kidney injury, major adverse cardiac events, and death 2. However, stable kidney function without acute deterioration is a favorable prognostic indicator - her eGFR has remained at 28 for 8 months.

Mandatory Perioperative Optimization

1. Anemia Management (Critical Priority)

Address the borderline anemia immediately - even mild preoperative anemia independently increases postoperative morbidity and mortality, including respiratory, urinary, wound, septic, and thromboembolic complications 3. The 2024 AHA/ACC guidelines emphasize this is particularly important in patients with CKD, who have high anemia prevalence 3.

Iron status evaluation required:

• Check ferritin, transferrin saturation, and assess for iron deficiency 3, 4
• If ferritin <100 ng/mL or transferrin saturation <20%: administer preoperative iron therapy (IV preferred if surgery within 2-4 weeks; oral if more time available) 3, 4
• The MCV of 99 (mildly elevated) suggests this is NOT iron deficiency anemia, but rather anemia of chronic disease related to CKD
• Consider nephrology consultation for potential erythropoiesis-stimulating agent (ESA) therapy if nutritional deficiencies are ruled out 4

2. Intraoperative Blood Conservation

Tranexamic acid should be administered to reduce intraoperative blood loss and avoid worsening anemia (Class 2a recommendation) 3. This is particularly important given her borderline hemoglobin and inability to tolerate significant blood loss.

3. Hemodynamic Monitoring Strategy

For patients with CKD stage 3-4 undergoing surgery, maintain mean arterial pressure >70 mmHg and cardiac index >2.4 throughout the perioperative period 5. Consider invasive hemodynamic monitoring depending on surgical complexity.

4. Transfusion Threshold

Use restrictive transfusion strategy with threshold of 8 g/dL for patients with cardiovascular disease, or 7 g/dL if no CVD 3. Given her age (81) and CKD, assume cardiovascular risk and use 8 g/dL threshold.

Common Pitfalls to Avoid

1. Do not assume "normal" hemoglobin means no intervention needed - at 12.8 g/dL, she is at the lower limit and any surgical blood loss will push her into anemia
2. Do not delay surgery for weeks to optimize - most anemias are correctable within 2-4 weeks with appropriate therapy 3
3. Do not overlook the stable kidney function - this is NOT acute kidney injury, and stability over 8 months is reassuring
4. Do not forget nephrotoxin avoidance - minimize NSAIDs, contrast agents, and other nephrotoxic medications perioperatively

Preoperative Checklist

• ✓ Iron studies (ferritin, transferrin saturation, TIBC)
• ✓ Nephrology consultation if iron deficiency confirmed or ESA therapy considered
• ✓ Cardiology risk assessment given age and CKD
• ✓ Plan for tranexamic acid administration
• ✓ Establish restrictive transfusion protocol (threshold 8 g/dL)
• ✓ Ensure adequate hydration status pre-procedure
• ✓ Review and minimize nephrotoxic medications

Type of Surgery Matters

The specific surgical procedure significantly impacts risk. If this is orthopedic surgery (hip, knee, spine), the evidence for preoperative anemia management and ESA use is strongest 4. The recent 2025 study specifically examined ankle fracture ORIF and found increased complications with reduced eGFR 1, making optimization even more critical.

Clearance is appropriate with the above optimization measures in place. The stable kidney function, well-controlled electrolytes, and normal hematologic parameters other than borderline hemoglobin support proceeding, provided anemia is addressed and appropriate perioperative monitoring is implemented.