Emicizumab Activity

CPT: 80299
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  • Hemlibra

Expected Turnaround Time

7 - 10 days

Specimen Requirements


Citrated plasma, frozen


1 mL

Minimum Volume

0.5 mL (Note: This volume does not allow for repeat testing.)


Light blue-top (3.2% sodium citrate) collection tube


Separate plasma from cells by centrifugation. Centrifuge separated plasma to yield platelet-poor plasma. Transfer plasma to a plastic transport tube before freezing.

Storage Instructions

Freeze. Stable at room temperature for 6 hours, and for 3 additional freeze/thaw Instructions cycles.

Test Details


This assay is intended for the evaluation of plasma emicizumab levels (µg/mL) in patients receiving emicizumab therapy.


Patients receiving factor VIII replacement therapy in addition to emicizumab may show falsely elevated results, as will patients with significant native factor VIII levels (greater than 25% native factor VIII activity). If factor VIII inhibitor levels are required while the patient is on emicizumab, this can be ordered by using Factor VIII Chromogenic Bethesda Profile, for Patients on Emicizumab [504722].

This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.


One stage clot detection


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
505715 Emicizumab Activity 505716 Emicizumab Activity ug/mL 99614-0

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