Laboratory Medicine

Test catalogue

Factor VIII Assay
Test Name Factor VIII Assay
Specimen Type / Requirements Container Type = Blue (Sodium Citrate) Minimum Testing Volume = Full draw 9:1 Ratio (9 parts blood to 1 part anticoagulant)
Specimen Handling Collection Instructions: Must indicate anticoagulant status to avoid delay. A Hematology consult is REQUIRED for *inpatient* samples (except for patients in Hematology/Oncology ward). Note: Order chromogenic FVIII for patients currently receiving emicizumab (Hemlibra) or Jivi (PEG bound recombinant FVIII concentrate). *Referred-in* patients and *outpatients* can be tested without a Hematology consult. Write your initials, date and time of collection on the collection label. Transportation: In/Outpatients: Send whole citrated blood at room temperature as soon as possible. Referred-in: Send frozen citrated plasma on dry ice. All samples must be sent to the Core Laboratory. Stability: Specimens are stable for 4 hours post collection at room temperature. Specimens which are not tested within 4 hours can be double-spun to remove the citrated plasma. The citrated plasma is stable at -20°C for up to two weeks or -70°C for up to six months. Sample Rejection Criteria: Clotted sample, grossly hemolyzed samples, unlabeled or samples with insufficient quantity will be rejected.
Required Documentation
Turnaround Time (TAT) Inpatient: 24hrs Referred-in: 3 days	Test Utilization
Reference Value Adult: 0.50 - 1.50 U/mL Pediatric (< 3 days): 0.83 - 3.29 U/mL
Test Code FVIII CHF8	Methodology Clotting Assay Chromogenic Assay
Testing Location SMH-Special Coagulation	Other Information Last Updated: Jan 13th 2022

Factor VIII Assay

Test Name

Factor VIII Assay

Specimen Type / Requirements

Container Type = Blue (Sodium Citrate)

Minimum Testing Volume = Full draw

9:1 Ratio (9 parts blood to 1 part anticoagulant)

Specimen Handling

Collection Instructions: Must indicate anticoagulant status to avoid delay. A Hematology consult is REQUIRED for inpatient samples (except for patients in Hematology/Oncology ward).

Note: Order chromogenic FVIII for patients currently receiving emicizumab (Hemlibra) or Jivi (PEG bound recombinant FVIII concentrate).

Referred-in patients and outpatients can be tested without a Hematology consult.

Write your initials, date and time of collection on the collection label.

Transportation: In/Outpatients: Send whole citrated blood at room temperature as soon as possible. Referred-in: Send frozen citrated plasma on dry ice. All samples must be sent to the Core Laboratory.

Stability: Specimens are stable for 4 hours post collection at room temperature. Specimens which are not tested within 4 hours can be double-spun to remove the citrated plasma. The citrated plasma is stable at -20°C for up to two weeks or -70°C for up to six months.

Sample Rejection Criteria: Clotted sample, grossly hemolyzed samples, unlabeled or samples with insufficient quantity will be rejected.

Required Documentation

Turnaround Time (TAT)

Inpatient: 24hrs

Referred-in: 3 days

Test Utilization

Reference Value

Adult:

0.50 - 1.50 U/mL

Pediatric (< 3 days):

0.83 - 3.29 U/mL

Test Code

FVIII
CHF8

Methodology

Clotting Assay
Chromogenic Assay

Testing Location

SMH-Special Coagulation

Other Information

Last Updated: Jan 13th 2022