In plain words
Quantitative blood loss, often called QBL, means measuring the blood you lose after birth instead of guessing by sight. Staff weigh soaked pads and drapes, or collect blood in a container, then add up the total. Eye estimates tend to undercount, so a measured total gives a clearer picture. Clinicians read the number alongside your pulse, blood pressure, and how firm the uterus feels, because a large amount of blood after birth can be a sign of . Many hospitals use this method under California Maternal Quality Care Collaborative protocols. Some bleeding is normal in the first hours after birth. The measure exists so that a change from the expected pattern is caught early. If bleeding is heavy, fills pads quickly, or you feel faint, tell your nurse right away.
The deeper version
Quantitative blood loss is the gravimetric or volumetric measurement of postpartum blood loss, typically by weighing used pads, drapes, and sponges, subtracting dry weight, and adding any collected volume. Visual estimation substantially underestimates true loss, and quantitative measurement is endorsed in ACOG Practice Bulletin 183 (2017) and in California Maternal Quality Care Collaborative protocols. Postpartum hemorrhage is defined in the same bulletin as cumulative blood loss of 1,000 mL or more within 24 hours of birth, or blood loss with signs of hypovolemia. Quantification supports detection of hemorrhage tiers and the timing of escalation. Studies of the accuracy of different weighing methods are mostly small, and the optimal threshold for escalation remains debated across institutions.
Where it comes up
- Heavy bleeding after birth (hemorrhage)Birth and the First Days
- The stages of labor, plainlyBirth and the First Days
- The hospital stay: what happens, what to askBirth and the First Days
What mothers here say about quantitative blood loss
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Sources
- American College of Obstetricians and Gynecologists — Practice Bulletin No. 183: Postpartum Hemorrhage (2017)
- California Maternal Quality Care Collaborative — Obstetric Hemorrhage Toolkit