Blood Thinners

Information For Patients on Blood Thinners

Blood thinners are Aspirin, Clopidogrel, Warfarin, Coumadin, Heparin etc

Blood thinners are given to prevent blood clots in certain medical conditions like
Deep Vein Thrombosis
Pulmonary Embolism
Cerebral Embolism
Unstable Angina
Heart Attack
Atrial Fibrillation
Disseminated Intravascular Coagulation
Prosthetic Heart Valves
Stent Placement

Blood Laboratory Tests that Evaluate Hemostasis and Bleeding Disorders


Laboratory TestsMeasures Normal Function*Normal Values/RangesImportance in Diagnosing Bleeding Disorders*Abnormal Values/Ranges
Platelet CountAdequate platelet numbers150,000 to 450,000/mm3Assess thrombocytopenia or inadequate numbers of platelets100,000 cells/mm3
Ivy Bleeding TimeAdequate platelet function2-10 minutesScreening test for thrombocytopathy; von Willebrand’s diseaseProlonged time:
>9-10 minutes
Platelet Function TestsAssess function of platelets: attachment, activation, and aggregation Discriminates between normal and abnormal function of platelets 
Prothrombin Time  (PT)Assess the time it takes to form a fibrin clot when calcium and tissue factor are added to the plasma (extrinsic pathway: coagulation function of factor VII; common pathway: factors V, X, prothrombin and fibrinogen)11 to 15 secondsAssess defects in the extrinsic pathway of the coagulation system: anticoagulant therapy (warfarin); Prothrombin deficiency, vitamin K deficiency; liver disease; antiplatelet drugsProlonged time:
>30 seconds
International Normalized Ratio (INR)Coagulation function of the extrinsic pathway: Factors V, VII, X, prothrombin and fibrinogen1.0Monitors oral anticoagulation therapy: warfarinINR greater than 1.2 in patients not on anticoagulation therapy. In patients on anticoagulants, therapeutic range is between 2.0 and 3.5
Partial Thromboplastin Time (activated aPTT)Assess the time it takes to form a fibrin clot when calcium and partial thromboplastin containing phospholipids are added to the plasma (intrinsic pathway: coagulation function of factors VIII, IX, XI and XII25 to 40 secondsAssess defects in the intrinsic pathway of the coagulation system: anticoagulant therapy (heparin); von Willebrand’s disease; hemophilia A and BProlonged time:
45 to 50 seconds
Thrombin TimeThrombin is added to blood to convert fibrinogen to fibrin24 to 35 secondsAssess defects in the conversion of fibrinogen to fibrinProlonged or beyond normal
*Normal values or ranges may vary among different laboratories

The therapeutic INR should be between 2.0 and less than 4.0 for most dental treatments. It depends on kind of procedure or treatment you will be requiring.. Some procedures might require us to consult your physician regarding your anticoagulation therapy. We might also advise you to stop your blood thinners based on invasiveness of the surgery after consulting your physician.

The INR should be done 24 hours before or on the morning of the surgery or dental appointment and let the lab fax the results to our office or email our office.

No you don’t need INR for all the dental procedures. You need to get INR test results for all the dental surgeries( Extractions, Periodontal Gum Surgeries, other oral surgeries like Biopsy, dento alveolar surgeries like Alveoplasty, vestibuloplasty, Dental Implants and Bone Grafting Procedures)

No. You can stop your blood thinners only at the advice of your physician. If you do not have recommendation from your physician then please do not stop your blood thinner. Some of the procedures can be done even when you are taking blood thinners. It depends upon the discretion of your Dental treatment Provider.

Feeling Nervous?

Speak to our friendly staff on the phone or email your particular concerns to us. You are treated as an individual and we take care to listen and understand your particular concerns.

Contact Info

Book Appointment

Please enable JavaScript in your browser to complete this form.


If requested appointment Time and Date is not available you will be notified. For cancellations without notice a Fee will be charged