Home
Helpvon Willebrand Factor Antigen (VWAg)
Collection Requirements
Source: blood
Container: Sodium citrate light blue
Volume: 2.7 mL in vacutainer filled to the
line
Turn Around Time
STAT: 3 hours
- Only available as STAT 7:00 a.m. – 1:00 p.m. Monday – Friday
- STAT at other times requires Sendout
Routine: 1-6 days
- Batched testing completed on Monday and Thursday
- Specimens must be received in Hematology by 9:00 a.m. to be included in the batch.
Availability
STAT
Routine
Lab Processing Instructions
Specimen: plasma
Double spin and separate
Freeze if testing will not be completed within 1 hour of
processing
Offsites:
- STAT: Send plasma at room temperature with a STAT courier
- Routine: Send plasma on dry ice
Performing Laboratory
Adele Hall
Adele Hall Lab Section
Hematology
Instrumentation/Methodology
Stago STAR
Reference Ranges
| Age | Normal Range (%) |
| 0-1 day | 40-287 |
| 1-3 days | 40-254 |
| 3 days - 1 month | 40-246 |
| 1-3 months | 40-206 |
| 3-6 months | 40-197 |
| >6 months | 52-175 |