We retrospectively analysed laboratory and clinical data of 274 children referred for abnormal preoperative coagulation test results (aPTT,PT) to the outpatients haematology clinic. In 140 of 274 patients (51.1%), coagulation tests were normal on repeated testing.
In the vast majority (79.8%) of our patients with confirmed abnormal screening tests, we did not find any factor deficiency. Most of the identified factor deficiencies were only transient.
In two patients was a mild bleeding disorder confirmed with unclear clinical significance.