Coagulation disorders are among the most dangerous complications in obstetrics. Dilution coagulopathy caused by excessive bleeding is the most frequent coagulation problem, followed by disseminated intravascular coagulation in different obstetric diseases, acquired or chronic thrombocytopenia, and von Willebrand disease. Accurate diagnosis requires anticipation of risk factors, careful assessment of the patient’s history and physical examination, and differentiated laboratory analysis. These are important preconditions for timely treatment of the coagulation disorder and for individualized disease-related obstetric management. Thus, maternal morbidity and mortality can be significantly reduced.