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Laboratory Values to Assess Bleeding Tendencies

Platelet Count (Plt)
150,000-400,000/mm³
Normal Value
<50,000/mm³
No Routine Dental Care
<20,000/mm³
Spontaneous Bleeding
Prothrombin Time (PT)
11-13 s
Normal Value
>20 s
No Routine Dental Care
International Normalization Ratio (INR)
0.9-1.2
Normal Value
>3.5
No Routine Dental Care
Activated Partial Thromboplastin Time (aPTT)
30-40 s
Normal Value
>70 s
No Routine Dental Care
Coagulation Factor Assay
60%-100%
Normal Value
<50%
No Routine Dental Care
<30%
No mandibular blocks
Bleeding time (BT)
3-8 min
Normal Value
>15 min
No Routine Dental Care

 


For additional laboratory values, see: Normal Laboratory Values.

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