Obstetrics Book

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Umbilical Cord Blood Gas Analysis

Aka: Umbilical Cord Blood Gas Analysis
  1. Indications
    1. Consider in all high risk deliveries
  2. Technique
    1. Sample obtained immediately after delivery
    2. Sample from Umbilical Artery (not the vein)
    3. Use preheparinized syringe
  3. Interpretation: Normal arterial blood
    1. pH: 7.28 +/- 0.05
      1. Unlikely to be significant if >7.10
    2. pCO2: 49 +/- 8.4
    3. pO2: 18 +/- 6.2
    4. HCO3: 22 +/- 2.5
    5. Base Excess: -4 +/- 2
  4. References
    1. Pomerace (2000) J Perinatol 5:338-9 [PubMed]

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