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Test Code LAB5417 Factor VIII Inhibitor, Quantitative, Plasma

Methodology

Absorbance measurement, Clot signature formation 

Literature References:

HemosIL SynthASil (pn 20006800) package insert issued 02/2016, Instrumentation Laboratory.

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Specimen Requirements

Specimen Type: Plasma

Container/Tube: Light-blue top (citrate)

Specimen Volume: 2 Full tubes

Specimen Minimum Volume: 2 Full tubes

Collection Instructions: 

  1. Draw a discard blue top tube prior to drawing a light-blue top (citrated) tube if using a Winged Infusion Set.  Discard tube should be under filled and discarded.
  2. Clotted blood or an insufficient specimen is not acceptable.
  3. Avoid phlebotomy techniques which cause hemolysis and heparin contamination.
  4. Follow nursing policy on volume of blood to discard prior to collecting blood from indwelling heparinized catheters.

Analyte Stability:
4 hours at 18° C to 24° C.

Platelet-free plasma can be frozen at -20 for transport on dry ice up to 72 hours
or stored 6 months at -70° C.

 

Additional Information: If the patient is a hospital patient and the hematocrit is >55%, call Barnes-Jewish Hematology Laboratory at 314-362-5203 for instructions.

Specimen Transport Temperature

Ambient Yes/Refrigerate NO/Frozen Yes

 

Reference Values

</= 0.5 Bethesda Units

Literature References:

Kasper CK. A more uniform measurement of factor VIII inhibitors. Throm Diath Haemorrh 1975;34:86972.

Day(s) Test Set Up

Monday, Wednesday, Friday

Cut-off time: 0700

Turnaround Time:
STAT: not available
Routine: results available the day of testing

Test Classification and CPT Coding

85335

Additional Information

For BJH Laboratory Use Only
Analyte Stability:

4 hours at 18° C to 24° C.

Platelet-free plasma can be frozen at -20 for transport on dry ice up to 72 hours
or stored 6 months at -70° C.

 

Laboratory Processing Instructions:

Test performed in BJH Core Lab.

LOINC Code Information

Name LOINC Code
Factor VIII Inhibitor, Quantitative, Plasma   3196-3