85301 Antithrombin iii antigen
Also known as: antithrombin antigen, AT III antigen
Measurement of antithrombin III (antithrombin) antigen concentration using immunoassay to quantify antithrombin protein levels independent of functional activity.
In Plain Language
anticlotting protein level; antithrombin measurement
Clinical Context
Evaluates discordance between antithrombin activity and antigen; may reveal dysfunctional antithrombin variants or heparin-associated antithrombin consumption.
RVU Information
CPT 85301 does not have a physician work RVU assigned by CMS. Reimbursement for this code is determined by payer-specific fee schedules.
Billing & Documentation
Lab and pathology codes require an order from the treating provider with clinical indication. For molecular pathology and genetic testing, document the specific analytes tested and clinical rationale.
How This Code Compares
This code has a work RVU of 0.00, meaning it does not have a physician work component assigned by CMS. In the Pathology & Lab category, 94% of codes share this characteristic.
Specialties
Frequently Asked Questions
What is CPT code 85301?
CPT 85301 (Antithrombin iii antigen) is a Pathology & Lab code. Measurement of antithrombin III (antithrombin) antigen concentration using immunoassay to quantify antithrombin protein levels independent of functional activity.
Who uses CPT code 85301?
CPT 85301 is used by Clinical Pathology, Coagulation, Hematology. Evaluates discordance between antithrombin activity and antigen; may reveal dysfunctional antithrombin variants or heparin-associated antithrombin consumption.
When is CPT 85301 used?
Evaluates discordance between antithrombin activity and antigen; may reveal dysfunctional antithrombin variants or heparin-associated antithrombin consumption.
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CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.