Related Experiment Video
Updated: Dec 14, 2025

Microfluidics in Assessing Platelet Function
Published on: November 8, 2024
Hemostatic Changes in Patients with COVID-19: A Meta-Analysis with Meta-Regressions
Matteo Nicola Dario Di Minno1, Ilenia Calcaterra2, Roberta Lupoli3
1Department of Translational Medical Sciences, Federico II University, 80131 Naples, Italy.
Insights
Severe COVID-19 is linked to significant hemostatic changes, including higher D-Dimer and fibrinogen levels, and lower platelet counts. These findings highlight coagulopathy as a key complication in severe coronavirus disease 2019.
Area of Science:
- Hematology
- Infectious Diseases
- Critical Care Medicine
Background:
- Coronavirus disease 2019 (COVID-19) is associated with coagulopathy, a significant factor in disease severity.
- Understanding hemostatic alterations in COVID-19 is crucial for managing patient outcomes.
Purpose of the Study:
- To conduct a meta-analysis assessing the relationship between COVID-19 severity and changes in key hemostatic parameters.
- To compare hemostatic markers in severe versus mild COVID-19 cases and in non-survivors versus survivors.
Main Methods:
- Systematic search and meta-analysis of studies reporting prothrombin time (PT), activated partial thromboplastin time (aPTT), D-Dimer, platelets (PLT), and fibrinogen levels.
- Standardized Mean Difference (SMD) was calculated to quantify differences between patient groups.
Main Results:
- Severe COVID-19 patients exhibited higher PT, D-Dimer, and fibrinogen levels, alongside lower platelet counts compared to mild cases.
- Non-survivors of COVID-19 showed significantly higher PT and D-Dimer values, and lower platelet counts than survivors.
- C-reactive protein levels correlated directly with differences in PT and fibrinogen.
Conclusions:
- Significant alterations in hemostatic parameters are strongly associated with COVID-19 severity and mortality.
- Further research is warranted to explore the prognostic value of these hemostatic markers in COVID-19 patients.
- Investigating hemostatic parameters may aid in predicting severe outcomes and long-term complications of COVID-19.
Background:
Complications of coronavirus disease 2019 (COVID-19) include coagulopathy. We performed a meta-analysis on the association of COVID-19 severity with changes in hemostatic parameters.
Methods:
Data on prothrombin time (PT), activated partial thromboplastin time (aPTT), D-Dimer, platelets (PLT), or fibrinogen in severe versus mild COVID-19 patients, and/or in non-survivors to COVID-19 versus survivors were systematically searched. The standardized mean difference (SMD) was calculated.
Results:
Sixty studies comparing 5487 subjects with severe and 9670 subjects with mild COVID-19 documented higher PT (SMD: 0.41; 95%CI: 0.21, 0.60), D-Dimer (SMD: 0.67; 95%CI: 0.52, 0.82), and fibrinogen values (SMD: 1.84; 95%CI: 1.21, 2.47), with lower PLT count (SMD: -0.74; 95%CI: -1.01, -0.47) among severe patients. Twenty-five studies on 1511 COVID-19 non-survivors and 6287 survivors showed higher PT (SMD: 0.67; 95%CI: 0.39, 0.96) and D-Dimer values (SMD: 3.88; 95%CI: 2.70, 5.07), with lower PLT count (SMD: -0.60, 95%CI: -0.82, -0.38) among non-survivors. Regression models showed that C-reactive protein values were directly correlated with the difference in PT and fibrinogen.
Conclusions:
Significant hemostatic changes are associated with COVID-19 severity. Considering the risk of fatal complications with residual chronic disability and poor long-term outcomes, further studies should investigate the prognostic role of hemostatic parameters in COVID-19 patients.
Related Concept Videos
Anticoagulant Drugs: Low-Molecular-Weight Heparins
Extrinsic and Intrinsic Pathways of Hemostasis
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
Venous Thrombosis III: Interprofessional Care
Venous Thrombosis IV: Nursing Management
Introduction to Hemostasis
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
Disorders of Hemostasis
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

