This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
D-Dimer values may be increased in all of the following Except: 
Select and explain. 
A. Myocardial infarction, B. Pneumonia, C. Anticoagulant therapy, D. Pregnancy
C: Anticoagulant therapy
Answer: C: Anticoagulant therapy 
Explanation: Answer is C (Anticoagulant therapy): D-Dimer values are falsely decreased in patients receiving anticoagulant therapy -Clinical Hematology Myocardial infarction, pneumonia and pregnancy are all established causes for false positive (Elevated) D-Dimer values Elevated True Positive Thromboembolic Diseases * PE * DVT * DIC * Others False Positive * MI * Pneumonia * Sepsis * Pregnancy * Cancer * Postoperative state * Hea failure