Table 1.
Examples of variable definitions of ‘early’ and ‘late’ cord clamping (adapted from Ref 4)
| Trial | Definition of Early Clamping | Definition of Late Clamping |
|---|---|---|
| Lanzkowsky (1960) | Within 15s | After signs of placental separation |
| Arcilla et al. (1967) | 2–10s | 3–5 min |
| Saigal et al. (1972) | Within 5s | 1–5 min |
| Nelson et al. (1980) | Within 60s | After pulsations ceased |
| Geethanath et al. (1997) | Immediate | When placenta in vagina |
| Rabe et al. (2000) | 20s | 45s |
| Emhamed et al. (2004) | Within 10s | After pulsations ceased |
| Rabe et al. (2004) | Immediate | 30s or more |
| Cernadas et al. (2006) | 15s | 3 min |
| Chaparro et al. (2006) | 10s | 2 min |
| Mercer et al. (2006) | 5–10s | 30–45s |