Quantitative blood loss + PPH risk
Quantitative blood loss for obstetric hemorrhage: QBL = measured mL + (pad grams - dry tare grams) with the 1 g = 1 mL convention, flags ACOG PPH thresholds by delivery route, and tiers CMQCC admission risk-factor count.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Measured / collected blood
- 300 mL
- Weighed pads/drapes
- 900 g
- Dry-pad + irrigation tare
- 100 g
- Vaginal birth
- Yes
- CMQCC admission risk factors
- 1
Result: QBL 1100 mL: postpartum-hemorrhage threshold met; medium risk tier.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- <1000 mL
- Below the quantitative postpartum-hemorrhage threshold; reassess for ongoing loss.
- >=1000 mL or signs
- Cumulative loss of 1000 mL or more, or any loss with signs of hypovolemia, defines postpartum hemorrhage.
What you enter
- Measured / collected blood (mL)
- Weighed pads/drapes (g)
- Dry-pad + irrigation tare (g)
- Vaginal birth
- Hemodynamic instability
- CMQCC admission risk factors (count)
How this is calculated
ACOG Practice Bulletin 183 (postpartum hemorrhage); AIM / CMQCC Obstetric Hemorrhage bundle (low/medium/high risk stratification). 1 g = 1 mL weighed-pad convention.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.