The incidence of symptomatic thrombosis is between 2.4 and 6.8 per 1000 neonatal intensive care unit admission while it is 5.1 per 100 000 live births. Compared to adults, the anticoagulant and fibrinolytic system of newborns is significantly different.

In this study, the aim is to evaluate infants with neonatal thrombosis in our unit to characterize acquired and genetic risk factors, the laboratory work-up parameters and the diagnosis approach.

All newborn patients diagnosed with neonatal thrombosis in our NICU between 2014 and 2019; were included in the study.

Patients' data: maternal and neonatal characteristics, consanguinity, need for resuscitation, Apgar scores, diagnoses, need for mechanical ventilation, sepsis, catheter placement, treatment regimens and hospital outcomes; Laboratory findings: CBC; D-dimer levels and the performed genetic test Thrombosis diagnosis was confirmed by imaging techniques such as ultrasonography (USG), echocardiography, and magnetic resonance imaging (MRI).

The genotypes: Factor V (Leiden) G1691A, prothrombin G20210A, MTHFRC677T, MTHFRA1298C, PAI-SERPINE1, Factor XIII V34L mutations

Inclusion Criteria:

• All newborn accepted at NICU

Exclusion Criteria:

• No

All newborns in NICU during 5 year period