Clinical Utilities
Includes the following tests: PT, PTT Thrombin Time, Factor XIII, Dilute Viper Venom test, and Ristocetin Cofactor.

CPT Codes

Reference Range

Component Information

Name		PT - PROTHROMBIN TIME - PROTIME
Method		Photo optical Clot detection
CPT Code		85610
Units
Ref Range		Instrument Specific
Reflex Reason

Name		THROMBIN TIME
Method		Photo optical Clot detection
CPT Code		85670
Units
Ref Range		< 21 seconds.
Reflex Reason

Name		FACTOR 13 ASSAY
Method		Visual clot detection
CPT Code		85291
Units
Ref Range		Normal
Reflex Reason

Name		DILUTE VIPER VENOM TEST - PLASMA
Method		Photo optical clot detection
CPT Code		85613
Units
Ref Range		29.0 - 47.0 secs.
Reflex Reason

Name		RISTOCETIN COFACTOR
Method		Platelet aggregation measured turbidimetricly to aid in the diagnosis of Von willebrand disease.
CPT Code		85245
Units
Ref Range		50 - 200%
Reflex Reason

Name		PARTIAL THROMBOPLASTIN TIME - PTT
Method		Photo optical clot detection
CPT Code		85730
Units
Ref Range		Instrument specific.
Reflex Reason

Collection Notes

Additional Comments
If DVVT is abnormal, reflex testing such as Dilute Viper Venom confirmation test, inhibitor screen , and platelet neutralization procedure may be required. If PTT is abnormal, and inhibitor screen will be reflexed and Factor VIII and IX may be required. An abnormal VW result should be followed up with VW antigen and Von Willebrand factor multimer analysis.