[Application of three different methods for estimating of the plasma volume in children]

Area of Science:

• Pediatric Physiology
• Body Composition Analysis
• Clinical Measurement Techniques

Background:

• Accurate estimation of plasma volume is crucial for pediatric health assessments.
• Existing methods for blood volume estimation in children vary in accuracy and applicability.
• Standardization of measurement techniques is needed for reliable clinical data.

Purpose of the Study:

• To compare the accuracy and consistency of three distinct methods for estimating plasma volume in children.
• To evaluate the suitability of each method across different body compositions.
• To identify the most practical and reliable method for pediatric blood volume assessment.

Main Methods:

• Blood volume was estimated in 57 children (aged 10-12) using three methods: body weight, the Woodhead formula, and bioelectrical impedance analysis (BIA).
• Statistical analyses, including Passing & Bablok regression, were employed to compare the methods.
• Children were subgrouped by body fat percentage to assess method performance variations.

Main Results:

• No significant differences were found between the three methods in overall blood volume estimation (P > 0.05).
• Regression analysis indicated good linear correlation between methods, with minor variations in residual standard deviation.
• Differences emerged when analyzing by body fat: body weight yielded the highest estimates, BIA the lowest in overweight/obese children, while normal-weight children showed no significant differences.

Conclusions:

• The three methods for estimating blood volume in children demonstrate good consistency.
• Estimations using body weight and the Woodhead formula offer convenience for clinical application.
• Bioelectrical impedance analysis (BIA) is particularly suitable for children with higher body fat percentages.