Obstetrical and neonatal factors associated with optimal public banking of umbilical cord blood in the context of delayed cord clamping
Bibliographic record
Abstract
Purpose To assess the association of specific newborn and maternal factors with indicators of increased blood-forming capacity in umbilical cord blood to inform strategic collection strategies that could augment the quality of units in public cord blood banks. Methods Data regarding 268 consecutive cord blood units (CBUs) banked by Canadian Blood Services were analyzed. Multivariate analysis was performed to identify factors associated with markers of hematopoietic potency and likelihood of utilization. Results Delayed clamping of the cord beyond 60 s was associated with reduced volume collected. Any delay in clamping of the cord was associated with reduced total nucleated cell counts. Newborn weight >4,000 g was also associated with greater blood volume in the collection but not with other measures of hematopoietic potency. Cord blood acidosis at birth (pH <7.17) and pregnancy-associated hypertension were associated with increased numbers of CD34+ cells and colony-forming units, whereas other maternal and neonatal factors (gestation number, APGAR scores, baby sex, method of delivery and gestational age) did not correlate with measures of hematopoietic potency. Cord blood acidosis and pregnancy-associated maternal hypertension occurred more often when there was no delay in cord clamping and correlated with enrichment of hematopoietic progenitors in banked CBUs. Conclusion Hypertension during pregnancy and low cord blood pH, indicators of physiologic stress of placental vasculature, were associated with greater enrichment of hematopoietic progenitors in CBUs. Collection of CBUs in these cases should not be overlooked and may represent ideal conditions for banking.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.009 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".