von Willebrand Factor Antigen VWFAC

Method(s) Microlatex-Particle Mediated Immunoassay (LIA)
Specimen Required
Collect

One adequately filled 3.0 mL light blue (sodium citrate) top tube.

Transport

**TIME SENSITIVE** For specimens that cannot be shipped to the laboratory to arrive within 4 hours of collection, see Collection and Processing of Coagulation Specimens information (link below).

Remarks

Draw blood into citrate (light blue) top tube filled to the proper level (1 part anticoagulant to 9 parts blood). Invert tube 3-4 times to avoid clotting.

Stability Ambient or Refrigerated: 4 hours; Frozen platelet-poor plasma: 2 weeks.
Unacceptable Conditions

Specimens that are clotted, hemolyzed, collected in the wrong tube, less than 90% filled, exceed stability limits or non-frozen plasma are unacceptable for testing.

Schedule Mon, Thu
Billing Code 4010127
CPTCode 85246
Notes Anticoagulent therapy may interfere with test results.
Preferred Specimen Collection Device(s)
Reference Interval

63-190 %

No Appointment Necessary
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12 Patient Service Centers in Central New York.

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