Inpatient and Outpatient Orderable

Antithrombin III (AT III) Activity/Antigen with Reflex

Synonyms

AT III ACTIVITY/ANTIGEN WITH REFLEX
AT3 FUNCT
LAB10675

Cerner Name

AT III Activity/Antigen with Reflex

Clinical Info

Specimen Sources

Blood, Arterial Blood, Capillary Blood, Central Line Blood, Venous

Specimen Types

Blood

Container

Blue Top Tube

Collection Instructions

Draw blood in a light blue-top (3.2% sodium citrate) tube(s). Fill tube(s) completely. Invert several times to mix blood. Spin down and place 1 mL of citrated plasma into 2 plastic vials each containing 0.5 mL of citrated plasma.
Note: 1. If no other tube is drawn, draw a discard tube.
2. If there is a delay in transport, spin down, remove plasma, spin plasma again, and place 1 mL of platelet-poor plasma into 2 plastics vials each containing 0.5 mL of platelet-poor plasma. Send specimen frozen. Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.

Specimen Volume

Transport Instructions

Specimen Stability

Methodology

Chromogenic-ACLTop Beckman/Coulter/IL

Days Performed

One to 2 times per week

Performing Laboratory

Northwell Health Laboratories

CPT

85300 Activity
85301 Antigen
Loinc Codes
Activity: 27811-9
Antigen: 27812-7

PDM

5302580

Only Orderable at Locations:

Orderable Everywhere

Results

Component Name	Base Name	Common Name	External Name
ANTITHROMBIN III ASSAY WITH REFLEX	AT3	ANTITHROMB III	Antithrombin III Activity

Result Interpretation

85-135%
If the AT3 functional is abnormal low (<85) the AT3 Antigen (AT3 IMMUNO) reflexes at an additional charge.

Forms

LAB10675

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