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Differences between capillary and venous blood counts in children-A data mining approach

Mathias Becker1, Thomas Gscheidmeier2, Hans-Jürgen Groß2

  • 1Department of Pediatrics and Adolescent Medicine, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany.

International Journal of Laboratory Hematology
|April 29, 2022
PubMed

Insights

Capillary blood counts differ from venous samples in children. This study quantifies these differences, improving the interpretation of pediatric blood test results.

Area of Science:

  • Pediatric Hematology
  • Clinical Pathology
  • Laboratory Medicine

Background:

  • Capillary blood sampling is a common alternative to venipuncture in pediatrics.
  • Interpreting capillary blood count results is challenging due to measurement differences.
  • Ethical and practical limitations hinder direct comparison studies in large pediatric cohorts.

Purpose of the Study:

  • To quantify the systematic differences between capillary and venous blood count analytes in children.
  • To provide data for more accurate interpretation of capillary blood test results across all pediatric age groups.

Main Methods:

  • A data mining approach was used to analyze laboratory data from patient care.
  • Over 486,000 blood counts from 2010-2017 in two German pediatric tertiary care centers were examined.
  • Differences were analyzed in 15,218 paired capillary and venous samples collected within 24 hours from children aged 0-18 years.

Main Results:

  • Mean systematic differences (capillary-venous) were identified for hemoglobin (+6.5 g/L), hematocrit (+2.38%), platelets (-7.01 × 10^9/L), RBC count (+0.18 × 10^12/L), WBC count (-0.64 × 10^9/L), MCV (+2.07 fL), MCH (+0.33 pg), MCHC (-4.4 g/L), and RDW (+0.40%).
  • Age had a negligible effect on these differences.
  • Analyte levels significantly influenced the capillary-venous differences for most parameters.

Conclusions:

  • The quantified differences enhance the interpretation of capillary blood count results in pediatric patients.
  • These findings are applicable across all age ranges and in both normal and abnormal physiological conditions.
  • Improved guidance for clinicians interpreting pediatric capillary blood tests is provided.
Abstract

Keywords:
capillary blood countsdata miningpaediatric haematology

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