The practical utility of routine postpartum hemoglobin assessment

Area of Science:

• Obstetrics and Gynecology
• Hematology
• Health Services Research

Background:

• Routine postpartum complete blood count (CBC) testing is a common practice.
• The clinical utility and cost-effectiveness of routine postpartum CBCs are debated.
• Evidence is needed to guide optimal postpartum laboratory testing strategies.

Purpose of the Study:

• To compare the outcomes of routine versus selective postpartum complete blood count (CBC) testing.
• To evaluate the impact of a policy change from routine to selective postpartum CBCs on transfusion rates and costs.
• To assess the safety and effectiveness of a selective approach to postpartum laboratory monitoring.

Main Methods:

• A historic case-control study design was employed, matching subjects from periods before and after a policy change.
• The study included 800 matched subjects.
• Primary outcome was the postpartum transfusion rate, with univariable, multivariable, and cost analyses performed.

Main Results:

• Eliminating routine postpartum CBC testing was associated with a significant decrease in transfusion rates (5.5% to 1.8%, P = .007).
• CBC utilization dropped from 59% to 22.2% (P < .0001) with no increase in adverse bleeding outcomes.
• Multivariable analysis identified postpartum hemorrhage, tachycardia, oliguria, and symptoms as key predictors of transfusion need, with selective CBC testing independently reducing transfusion risk (OR, 0.30; 95% CI, 0.12-0.72).
• Estimated annual cost savings were $58,000.

Conclusions:

• A policy of selective postpartum complete blood count (CBC) testing leads to fewer transfusions.
• Targeted laboratory testing reduces healthcare costs and improves the quality of patient care.
• Clinical predictors, rather than routine testing, are effective in identifying patients requiring postpartum transfusion.