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Test Code Unf Hep Unfractionated Heparin Assay

Aliases

UNF

Patient Preparation

No special patient preparation required

Special Collection Instructions

Properly filled 9:1 ratio (blood to anticoagulant); 3.2% NaCitrate tube

Collection Method

Venous Draw; properly filled 9:1 ratio (blood to anticoagulant)

Container

Light Blue Sodium Citrate
 

Reference or Target Ranges

0.3 – 0.7 IU/mL

Reportable Units

IU/mL

Critical Value

Not defined for this assay

Reasons for Rejection

Hemolysis Threshold If visible – reject
Icterus Threshold If visible – reject
Lipemia Threshold If visible – reject
Interfering Subtances/Other Short draws, over draws, clotted, improperly labeled, samples > 1 hour from collection

Specimen Stability

Ambient 4 hrs; Must be spun within 1 hour of colllection
Refrigerated (4°C to 8°C) N/A
Frozen(-70°C to -20°C) 15 days@ -20°C; 1 year @ -70°C

Special Handling

Must be spun/received in Lab within 1 hour of phlebotomy

Once sample is received in Lab- testing must be performed on Platelet Poor Plasma

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Stat:1 hour on arrival to lab
Routine:4 hours on arrival to lab
Stat Availability Yes
Performing Bench Coagulation
Methodology/Method Description UH: Werfen ACL TOPS - Chromogenic Assay

Additional Information/Important Notes

Specimen must be received in lab <1 hour after collection

Useful For

Unfractionated Heparins (UNF) are used for the prevention and treatment of thromboembolic diseases. The quantitative determination of UNF are useful for monitoring treatment efficacy.

Minimum Volume

0.5 mL of plasma from a properly filled 1.8 mL or 2.7 mL NaCitrate (light blue) tube

CPT Codes

85520