VON WILLEBRAND ANTIGEN

LAB757

Collect

One 2.7 mL Blue top tube (sodium citrate 3.2%). Fill tube to at least 90% capacity.

All blue tops collected for coagulation assays which do not have a blood culture collected first must have a discard tube collected prior to filling. Discard tube should be another blue top in which greater than 1 mL of blood is collected.

Pediatric Collection

0.5 mL of platelet poor plasma.

Unacceptable Conditions

Sample not properly identified; incorrect container; insufficient sample volume; more than 4 hours since collection; clotted sample; hemolysed sample; tube fill volume less than 90% or greater than 110%; sample diluted with I.V. fluid.

Storage/Transport Temperature

Internal: Deliver to lab immediately.
Offsite: Centrifuge the sample to obtain platelet poor plasma. Place plasma in a plastic aliquot container and transport frozen.

Stability (from collection to initiation)

Whole blood: Ambient, 4 hours.

Platelet poor plasma: Ambient, 4 hours; Refrigerated, 4 hours; Frozen (-20 degrees C), 2 weeks; Frozen (-70 degrees C), 6 months.

Remarks

Reference range established using 3.2% sodium citrate. Patient history is helpful for interpretation of result. A decrease in von Willebrand antigen may be seen in von Willebrand disease.

Performed by

PCL Clinical Laboratory - Specials (Coagulation)

Performed

Monday and Thursday, day shift only

Methodology

Immunoturbidimetric assay

Reported

Same day

Synonyms

  • VWF Antigen
  • LAB757

Reference Interval

Effective 01/11/2016:

49 - 163%

Before 01/11/2016:

66.0-184.0 U/dL

Interpretive Data

Interpretation of results under 50.0 U/dL will be done in conjunction with patient's ABO blood typing.

Performed by

PCL Clinical Laboratory - Specials (Coagulation)

CPT Codes

85246

Collection

LAB757

Collect

One 2.7 mL Blue top tube (sodium citrate 3.2%). Fill tube to at least 90% capacity.

All blue tops collected for coagulation assays which do not have a blood culture collected first must have a discard tube collected prior to filling. Discard tube should be another blue top in which greater than 1 mL of blood is collected.

Pediatric Collection

0.5 mL of platelet poor plasma.

Unacceptable Conditions

Sample not properly identified; incorrect container; insufficient sample volume; more than 4 hours since collection; clotted sample; hemolysed sample; tube fill volume less than 90% or greater than 110%; sample diluted with I.V. fluid.

Storage/Transport Temperature

Internal: Deliver to lab immediately.
Offsite: Centrifuge the sample to obtain platelet poor plasma. Place plasma in a plastic aliquot container and transport frozen.

Stability (from collection to initiation)

Whole blood: Ambient, 4 hours.

Platelet poor plasma: Ambient, 4 hours; Refrigerated, 4 hours; Frozen (-20 degrees C), 2 weeks; Frozen (-70 degrees C), 6 months.

Remarks

Reference range established using 3.2% sodium citrate. Patient history is helpful for interpretation of result. A decrease in von Willebrand antigen may be seen in von Willebrand disease.

Performed by

PCL Clinical Laboratory - Specials (Coagulation)

Ordering

Performed

Monday and Thursday, day shift only

Methodology

Immunoturbidimetric assay

Reported

Same day

Synonyms

  • VWF Antigen
  • LAB757
Result Interpretation

Reference Interval

Effective 01/11/2016:

49 - 163%

Before 01/11/2016:

66.0-184.0 U/dL

Interpretive Data

Interpretation of results under 50.0 U/dL will be done in conjunction with patient's ABO blood typing.

Performed by

PCL Clinical Laboratory - Specials (Coagulation)

Administrative

CPT Codes

85246

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