Features & Benefits: REAGENT 1 and REAGENT 2: ready to use Stability: 90 days at 2-8 °C after opening Fresh serum or plasma obtained with lithium, sodium, or ammonium heparin is the specimen of choice.

Linearity: 5 - 250 U/L

Expected Value: ≤ 38 U/L

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The US catalog number is 17.401B (4 x 10 mL (R1); 1 x 8 mL (R2); 1 x 1 mL (Cal)).