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Short-term venous stasis influences routine coagulation testing
Giuseppe Lippi1, Gian Luca Salvagno, Martina Montagnana
1Department of Morphological and Biomedical Science, Clinical Chemistry Institute, University of Verona, Italy. ulippi@tin.it
Summary
Short-term venous stasis during blood collection significantly impacts coagulation tests. Even 1-minute stasis alters results, with 3-minute stasis showing clinically meaningful differences in prothrombin time, fibrinogen, and D-dimer.
Area of Science:
- Clinical Pathology
- Hematology
- Laboratory Medicine
Background:
- Preanalytical variability is a major source of errors in coagulation testing.
- Clotting assays are sensitive to standardization issues throughout the analytical process.
Purpose of the Study:
- To evaluate the impact of short-term venous stasis on routine coagulation test results.
- To determine if venous stasis duration (1 vs. 3 minutes) affects test accuracy.
Main Methods:
- Activated partial thromboplastin time, prothrombin time, fibrinogen, and D-dimer were measured.
- Plasma specimens were collected with and without venous stasis (1 and 3 minutes).
- Statistical analysis included Pearson's correlation, Passing and Bablok regression, and paired Student's t-test.
Main Results:
- Statistically significant differences were observed for most parameters after 3-minute stasis.
- One-minute stasis also caused significant differences, except for activated partial thromboplastin time.
- Clinical significance was reached for prothrombin time, fibrinogen, and D-dimer after 3-minute stasis.
Conclusions:
- Venous stasis during venipuncture has clinically meaningful effects on coagulation testing.
- Short-term venous stasis (up to 3 minutes) primarily causes hemoconcentration.
- Standardized procedures minimizing venous stasis are crucial for accurate coagulation test results.