Test ID: ZG829
Component(s): Z4982 Factor VIII Activity LOINC: 3209-4, Z4983 von Willebrand Factor (vWF) Ag LOINC: 27816-8, Z4984 vWF Activity LOINC: 6014-5
CPT code:85245, 85240, 85246
LOINC:
Specimen Type: Blue (sodium citrate)
Frequency: 2 – 3 days
Instructions: 2 mL Plasma from Blue-top (sodium citrate), FRZ, PLT poor
Text: Diagnose von Willebrand factor (vWF) deficiency. vWF performs major functions in hemostasis, acting to connect platelets to each other & to subendothelial cells at the site of vascular damage. Consider vWD in the diagnosis of cases where patients with a bleeding history have a normal protime & aPTT. vWD is the most common congenital bleeding disorder.
Methodology:
REFLEX TEST: Z4985 Interpretation LOINC: 21026-0