Test Code LAB2604 Antithrombin III Activity, Plasma

Important Note

When forwarding specimens to another lab for testing, frozen, double-spun specimens must be sent.

Test Name in EPIC	EPIC Test Code	Mnemonic
ANTITHROMBIN III	LAB2604	AT3

Chromogenic (Functional) Assay

Specimen Type: Platelet-poor plasma

Container/Tube:

Fill Blue top tube to the etched line located just below the cap of the tube.

Preferred: Light-blue top (sodium citrate)

Acceptable: Sodium Citrate (BD® or Greiner tubes)

Specimen Volume: 1 mL

Specimen Minimum Volume: 0.5 mL

Collection Instructions:

1. If sending from a site, spin down, remove top 2/3 of plasma, and spin plasma again in a polypropylene (cloudy plastic) vial.

2. Aliquot top 3/4 and place platelet-poor plasma in a polypropylene (cloudy plastic) vial.

3. Glass vials are not acceptable for processing/transport/storage.

Additional Information: Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.

Ambient 8 hours/Frozen 1 month at -20°C OK/Refrigerate NO

Monday, Thursday

Coagulation-

SMDC Clinical Lab

Fargo Hospital Lab

85300

TEST	AGE	% Activity
Antithrombin III Activity Assay	0 – 2 days	39 - 97
	3 days – 30 days	N/A
	31 days – 1 Year	N/A
	1 Year - 5 Years	82 - 139
	6 Years - 10 Years	90 - 131
	11 Years - 17 Years	77 - 132
	18 Years - 150 Years	83 - 128