Umbilical Cord Gas

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Umbilical Cord Gas-BETA

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	VENOUS	Normal Range	ARTERIAL	Normal Range
pH		7.25 to 7.45		7.18 to 7.38
P_CO2		27.0 to 49.4 mmHg		32.4 to 66.0 mmHg
P_O2		17.4 to 41.0 mmHg		5.6 to 30.4 mmHg
BD_{ECF mean (SD)}		4 (3.5) mmol/L		4.79 (3.46) mmol/L

Base Deficit extracellular fluid ( BD ecf )=

− 0.9149 ( 0.23 × pCO 2 × 10 ^[ pH − 6.1 ] − 24.1 + 16.21 × [ pH − 7.4 ] )

Quantity that reflects only the non-respiratory (metabolic) component of acid-base disturbances.

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. . Per Olofsson P, Umbilical cord pH, blood gases, and lactate at birth: normal values, interpretation, and clinical utility
https://www.ajog.org/article/S0002-9378(22)00537-3/fulltext
Accessed5/7/2023

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