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Lab Test Dictionary

Heparin Neutralized APTT


Enzyme Digestion and mechanical measurement of aPTT


Hepzyme PTT

Specimen Type


Performing Lab


Epic ID


Lab Test Days

As Received

Standard TAT

4 Hours

Stat TAT

1 Hour

Collection Information

Specimen Required

(one) 1.8 mL or (one) 2.7 mL Blood

Container Type

Light Blue (Sodium Citrate)

Collection Instructions

Fill tube completed.

Processing Information - Lab Use Only

Specimen Stability

Room Temp=4 Hours; Refrigerated=Unacceptable; Frozen=2 Weeks (Plasma only)

Rejection Criteria

Clotted; Hemolysis; Under filled tube; >4 Hours Old; Refrigreated; Chilled

Test Volume Required

1.3 mL Plasma

Minimum Test Volume

0.9 mL Plasma

Processing Instructions

Check tube for clots and centrifuge specimen in Coag area.

CPT Codes

85525, 85730