Summary of findings 2. Direct measurement using calibrated drapes compared to indirect estimation using gravimetric technique for blood loss estimation after vaginal birth.
| Direct estimation using calibrated drapes compared to indirect estimation using gravimetric technique | ||||||
| Patient or population: women undergoing vaginal birth Setting: hospital maternity unit, India Intervention: direct estimation using calibrated drapes (Excellent BRASSS‐V Drape™) Comparison: indirect estimation using gravimetric technique (blood and blood‐soaked materials weighed and measured) | ||||||
| Outcomes | Anticipated absolute effects* (95% CI) | Relative effect (95% CI) | № of participants (studies) | Certainty of the evidence (GRADE) | Comments | |
| Risk with gravimetric technique | Risk with using calibrated drapes | |||||
| Postpartum anaemia | trial did not report outcome | ‐ | ‐ | ‐ | ||
| Severe morbidity | trial did not report outcome | ‐ | ‐ | ‐ | ||
| Blood loss ≥ 500 mL | Study population | RR 1.86 (1.11 to 3.11) | 900 (1 RCT) | ⊕⊕⊕⊕ High | ||
| 47 per 1000 | 87 per 1000 (52 to 145) | |||||
| Blood transfusion | Study population | RR 1.00 (0.06 to 15.94) | 900 (1 RCT) | ⊕⊕⊝⊝ Low a | ||
| 2 per 1000 | 2 per 1000 (0 to 35) | |||||
| Use of plasma expanders | Study population | RR 0.67 (0.19 to 2.35) | 900 (1 RCT) | ⊕⊕⊝⊝ Low a | ||
| 13 per 1000 | 9 per 1000 (3 to 31) | |||||
| Use of therapeutic uterotonics | Study population | RR 1.01 (0.90 to 1.13) |
900 (1 study) | ⊕⊕⊕⊕ High | ||
| 564 per 1,000 | 570 per 1,000 (508 to 638) |
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| Maternal infection | trial did not report outcome | ‐ | ‐ | ‐ | ||
| *The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI). CI: confidence interval; RR: risk ratio | ||||||
| GRADE Working Group grades of evidence High certainty: we are very confident that the true effect lies close to that of the estimate of the effect Moderate certainty: we are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different Low certainty: our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect Very low certainty: we have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect | ||||||
a Imprecision: wide confidence interval crossing the line of no effect