Preoperative Diagnostics for Cesarean Section
For routine, uncomplicated cesarean deliveries in ASA I-II patients, extensive preoperative laboratory testing is not required—focus on clinical assessment, VTE risk stratification, and aspiration prophylaxis rather than reflexive laboratory panels.
Risk-Stratified Approach to Preoperative Assessment
Standard Preoperative Requirements (All Patients)
Aspiration Prophylaxis Protocol 1:
- Clear liquids permitted up to 2 hours before surgery
- Light meal up to 6 hours before surgery (8 hours after large/fatty meals)
- Consider non-particulate antacids, H₂ receptor antagonists, and/or metoclopramide before surgical procedures
VTE Risk Assessment 2:
- All patients require screening for VTE risk factors preoperatively
- Sequential compression devices should be applied before surgery and continued until full ambulation (mandatory for all cesarean deliveries)
Intravenous Access 1:
- Establish IV access before neuraxial analgesia/anesthesia initiation
- Fixed volume preloading is not required
High-Risk Patients Requiring Additional Workup
For patients with severe preeclampsia/HELLP syndrome 3:
Complete the following laboratory panel:
- Hematologic: Platelet count, white blood cell count, PCV, partial thromboplastin time, fibrinogen, fibrin degradation products, peripheral blood smear
- Hepatic: Liver function tests (AST, ALT, LDH)
- Renal: Creatinine, urea, uric acid
- Metabolic: Blood glucose (severe hypoglycemia reported with HELLP)
- Imaging: Chest X-ray to exclude pulmonary edema
- Cardiac: ECG examination
Transfusion thresholds 3:
- Platelet transfusion if count <50,000/mm³
- Blood transfusion if hemoglobin <10 g/dL
For patients with placenta previa and prior cesarean delivery 4:
- Preoperative ultrasound protocol including:
- Placental position and size
- Myometrial thickness and uterine dehiscence assessment
- Placental bulging evaluation
- Color Doppler mapping of uteroplacental, intraplacental, and bladder interface vascularity
- Intraplacental lacunae identification
- Both transabdominal and transvaginal approaches
Monitoring Requirements
Critically ill patients 3:
- Central venous pressure monitoring or pulmonary artery catheter for fluid management
- Urinary catheter for hourly output monitoring
- Continuous monitoring: CVP, urinary output, non-invasive BP, ECG, oxygen saturation
- Arterial blood gas if pulmonary complications or metabolic disturbances suspected
Standard monitoring 1:
- Basic and advanced life-support equipment must be immediately available in the operative area
Common Pitfalls to Avoid
Over-testing low-risk patients: The evidence shows routine laboratory panels in ASA I-II patients increase costs without changing perioperative management 5. Reserve testing for clinical indications.
Delayed antibiotic administration: Antibiotics must be given within 60 minutes before skin incision, not after cord clamping 6. Use weight-based cefazolin (2g if obese or ≥80kg); add azithromycin 500mg IV if labor or ruptured membranes present.
Inadequate VTE prophylaxis planning: Patients with personal history of DVT/PE or inherited thrombophilia require both mechanical AND pharmacologic prophylaxis (low-molecular-weight heparin for 6 weeks postoperatively) 2.
Missing coagulopathy in preeclampsia: Regional anesthesia may be contraindicated if platelet count is critically low—check coagulation studies before neuraxial techniques 3.
Inadequate assessment of high-risk anatomy: Patients with ≥2 prior cesarean deliveries and placenta previa require expert ultrasound evaluation to identify placenta accreta spectrum and plan for potential hysterectomy 4.
Anesthesia Considerations
Regional anesthesia is preferred 1, 6 as it improves pain control, organ function, mobility, and postoperative recovery. However, assess coagulation status in patients with preeclampsia before neuraxial techniques.
Airway management preparation 1:
- Basic airway equipment immediately available during neuraxial analgesia
- Portable difficult airway equipment readily available in operative area
- Preformulated difficult airway strategy required