Antithrombin III Antigen
Test Mnemonic
AT3AG
CPT Codes
- 85301 - QTY (1)
- 85300 - QTY (1)
LOINC ®
27812-7
Aliases
- AT III Antigen
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Platelet-poor plasma | Sodium citrate (Lt. Blue) | Frozen, Critical | See attachment for detailed collection instructions. Do not use needles smaller than 23 gauge. Draw a pilot (light blue) tube and discard before drawing coagulation specimen. Tube must be completely filled. Mix gently by inversion 5-6 times. Centrifuge at 1700 g for 15 minutes or at a speed/time to produce platelet-poor plasma. Immediately remove top 2/3 of platelet-poor plasma and use plastic pipette to transfer 1 mL platelet-poor plasma into a standard plastic aliquot tube. Freeze immediately. Do not use glass vials. Separate specimens must be submitted when multiple tests are ordered. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Frozen | 1 month |
| Ambient | 8 hours |
| Refrigerated | Unacceptable |
Days Performed
Sun - Sat
Turnaround Time
2 - 3 days
Methodology
| Name | Description |
|---|---|
| Latex Immunoassay (LIA) |
Reference Range
| Antithrombin III Antigen | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Normal | 82 - 136 | % |
Special Info
CRITICAL FROZEN. See attachment for detailed collection instructions. Separate specimens must be submitted when multiple tests are ordered. Serum, EDTA plasma, clotted or hemolyzed specimens are unacceptable. This test is New York DOH approved.
Clinical Info
Not recommended as an initial test to detect antithrombin (AT) deficiency. Use to determine subtype in AT-deficient individuals.