Prothrombin Time (PT/INR)

CPT: 85610
Coagulation

What This Test Measures

Measures extrinsic coagulation pathway; used to monitor warfarin therapy and assess liver function.

Preparation

No fasting required

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

INR standardizes PT results; elevated in warfarin use, vitamin K deficiency, liver disease

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

D68.9Coagulation defect, unspecified
I82.409Acute embolism and thrombosis of unspecified deep veins
Z79.01Long-term (current) use of anticoagulants

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Lab Codes

Proprietary codes used by each lab for this test.

ARUP Laboratories
0030090(order_code)
CPL
1425(order_code)
LabCorp
005199(order_code)
Mayo Clinic Labs
PTINR(order_code)
Quest Diagnostics
8847(order_code)

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For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.