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Blue Top (Citrate Tube)
Specimen Requirements
Preferred:
Container/Tube: Blue Top (Citrate Tube)
Minimum Volume: 1 mL Blood
Collection Instructions: Spin immediately.
Specimen Stability
Analyze within 1 Hour: Use Primary Tube
Analyze within 4 Hours:
Spin immediately. Remove the top 2/3 plasma within 1 hour and spin again. Remove the top 2/3 of the plasma from this sample for testing.
Analyze > 4 Hours: Remove the top 2/3 plasma within 1 hour and spin again. Remove the top 2/3 of this sample and freeze at -70 degrees
Reference Range
0- 6 months: 17.0-53.0 %
6 months-16 Years: 35.0-140.0%
> 16 Years: 70.0-140.0 %
Methodology
Fixed absorbance: Clotting Assay
CPT
85303
Lab Handling
Analyze within 1 Hour: Use Primary Tube
Analyze within 4 Hours:
Spin immediately. Remove the top 2/3 plasma within 1 hour and spin again. Remove the top 2/3 of the plasma from
this sample for testing.
Analyze > 4 Hours: Remove the top 2/3 plasma within 1 hour and spin again. Remove the top 2/3 of this sample and freeze at -70 degrees