Laboratory Values to Assess Bleeding Tendencies

	Value	Assessment
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 Normalized 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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Related Pages

• Medical Disorders
  • Bleeding Disorders
• Oral Health Care Considerations
  • Bleeding Disorders
  • Antiplatelet and Anticoagulation Therapy Considerations
• Laboratory Values
  • Laboratory Values for Different Bleeding Disorders
  • Normal Laboratory Values