Table 1 Studies reporting umbilical cord values for term and preterm infants.
| Author | Umbilical artery | Umbilical vein | Number | Population studied | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| pH | Base excess (mmol/l) | Pco2 (kPa) | Po2 (kPa) | pH | Base excess (mmol/l) | Pco2 (kPa) | Po2 (kPa) | |||
| Victory et al21 2004 | 7.24 (0.07) | −5.6 (3.0) | 7.33 (0.06) | −4.5 (2.4) | 20 456 | Term non‐anomalous singletons | ||||
| Helwig et al22 1996 | 7.26 (0.07) | −4.0 (3.0) | 7.05 (1.33) | 2.26 (0.8) | 7.34 (0.06) | −3.0 (3.0) | 5.45 (0.93) | 3.86 (0.93) | 15 073 | All gestations, all delivery types, Apgar >75 |
| Thorp et al18 1989 | 7.24 (0.07) | −3.6 (2.7) | 7.49 (1.14) | 2.38 (0.92) | 7.32 (0.06) | −2.9 (2.4) | 5.83 (0.89) | 3.82 (0.97) | 1694a 1820v | Term, nulliparous, SOL, all delivery types |
| Riley and Johnson20 1993 | 7.27 (0.07) | −2.7 (2.8) | 6.69 (1.48) | 2.45 (1.09) | 7.34 (0.06) | −2.4 (2.0) | 5.41 (1.05) | 3.79 (1.02) | 3522 | Term singleton infants, vaginal delivery |
| Dickinson et al23 1992 | 7.26 (0.08) | −3.2 (2.9) | 7.05 (1.33) | 2.53 (1.05) | 7.33 (0.07) | −2.6 (2.5) | 5.77 (1.1) | 3.88 (1.29) | 1393a 1526v | Preterm (24–36 weeks), normal CTG |
Data are presented as mean (SD). Arterial (a) and venous (v) sample numbers are given separately where available.
CTG, cardiotocogram; SOL, spontaneous onset of labour; SVD, spontaneous vertex delivery.