Obstetrics Book

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Umbilical Cord Blood Gas Analysis

Aka: Umbilical Cord Blood Gas Analysis
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  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

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