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Test Code HZMPTT HEPZYME APTT, LAB5025

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube:

Preferred: Full blue-top (sodium citrate) 1.8 mL tube-Hemolyzed or short draw specimen is not acceptable.
Specimen Volume:
 0.5 mL sodium citrate plasma

Stability: Centrifuged specimens at 2-4°C or at 18-24°C must be tested within 4 hours of specimen collection.

Collection Instructions: Centrifuge immediately after draw. Forward promptly. If there is a delay in transport of >4 hours or if mailing time exceeds 4 hours, spin down, remove plasma from cells and freeze immediately in plastic vial. Send specimen frozen. Specimen stability is ≤2 weeks when frozen at -20° C.

 

NOTE:  Patients with a hematocrit of >55% must be recollected using an altered amount of sodium citrate.

Reference Values

20.0-27.0 seconds

 

Critical: ≥50 seconds

 

Useful For

For patients in the NICU, heparin is used to flush and keep the umbilical lines patent.  Even with the withdrawal of waste, heparin may remain in the line.  The sample treated with Hepzyme rules out heparin contamination being responsible for abnormal coagulation results.

Day(s) Test Set Up

Monday through Sunday

Methodology

Clot Based Assay

Testing Classification and CPT Coding

85525