Related Experiment Video
Updated: May 7, 2025
05:58
Evaluation of a Point-of-Care Testing Analyzer for Measuring Peripheral Blood Leukocytes
Published on: March 22, 2022
3.9K
Systematic review: differences in complete blood count component rhythms
Anna Busza1, Vani Sharma2, Kendall Ferguson3
1Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
Sleep Advances : a Journal of the Sleep Research Society
|December 30, 2024
Summary
Complete blood count (CBC) reference values often ignore diurnal variations. This review found significant daily fluctuations in CBC components, with lymphocytes peaking overnight, highlighting the need for time-dependent interpretation in precision medicine.
Area of Science:
- Hematology
- Clinical Pathology
- Chronobiology
Background:
- The complete blood count (CBC) is a routine diagnostic test with broad reference ranges.
- Current interpretation of CBC values does not account for diurnal variations.
- Understanding daily rhythms of CBC components is crucial for accurate clinical assessment.
Purpose of the Study:
- To systematically review existing literature on the diurnal variation of complete blood count (CBC) parameters.
- To identify peak and trough times for various CBC components.
- To inform potential time-dependent interpretation of CBC results.
Main Methods:
- Systematic literature search for studies with at least three CBC collections over 24 hours.
- Screening of 164 full-text articles, with 32 included in the final analysis (548 patients).
- Meta-analysis using polynomial functions and forest plots to analyze CBC component data.
Main Results:
- Significant diurnal variations were observed across multiple CBC components.
- Lymphocytes exhibited a distinct circadian rhythm, peaking overnight (23:54) and troughing in the morning (10:47).
- Erythrocytes, hemoglobin, and hematocrit peaked in the morning; platelets, neutrophils, monocytes, and basophils peaked in the late afternoon.
Conclusions:
- Limited studies characterize CBC component rhythms, but significant daily variations exist, particularly for lymphocytes.
- Findings suggest the potential for time-dependent interpretation of CBC results.
- Future research with larger datasets is needed to support precision medicine approaches.
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