Calculator

Units: PCO2 and PO2mmHg. BDECF is reported in mmol/L.

Venous
pH
7.25–7.45
PCO2
27.0–49.4 mmHg
PO2
17.4–41.0 mmHg
BDECF
~4 (SD 3.5) mmol/L
Arterial
pH
7.18–7.38
PCO2
32.4–66.0 mmHg
PO2
5.6–30.4 mmHg
BDECF
~4.79 (SD 3.46) mmol/L
Base Deficit (extracellular fluid), BDECF
BDECF = −0.9149 ( 0.23 × pCO2 × 10^(pH − 6.1) − 24.1 + 16.21 × (pH − 7.4) )
Quantity that reflects the non-respiratory (metabolic) component of acid–base disturbances.
Disclaimer: This calculator is for educational purposes only. All calculations must be confirmed before clinical use. Results are not a substitute for clinical judgment.
References
  1. Yeomans ER, Hauth JC, Gilstrap LC III, Strickland DM. Umbilical cord pH, PCO2, and bicarbonate following uncomplicated term vaginal deliveries. Am J Obstet Gynecol. 1985;151(6):798–800.
  2. Wiberg N, Källén K, Olofsson P. Base deficit estimation in umbilical cord blood is influenced by gestational age, choice of fetal fluid compartment, and algorithm for calculation. Am J Obstet Gynecol. 2006;195(6):1651–1656.
  3. Olofsson P. Umbilical cord pH, blood gases, and lactate at birth: normal values, interpretation, and clinical utility. Am J Obstet Gynecol. 2022.
    AJOG full text (accessed 5/7/2023)
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