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FACTOR INHIBITOR SCREEN: (089-0006)
Clinical Indication:

 Screens for inhibitors of factors of the extrinsic and intrinsic systems or for the presence of circulating Lupus anticoagulants.
Test Mnemonic:

 INHSCR
Methodology:

 Electromagnetic Viscosity Detection
Performed:

 Samples are accepted 24 hours per day at Sample Management, 5.136 McCullough Bldg.
Turnaround Time:

 4 hours
Specimen Requirements:

Collect: Routine venipuncture; discard 1st mL of blood or collect other tubes (EDTA, red-topped) prior to collecting sample in blue-topped (3.2% sodium-citrate) tube.

Specimen Preparation: Samples should be received in laboratory within ½ hour of draw for best results.  Acceptable up to 4 hours after draw, at ROOM TEMPERATURE.

Specimen: Blood

Volume: 2.7ml

Minimum Volume: Call Lab

Storage/Transport: NOTE: If delivery time is to be greater than 4 hours from time of draw, centrifuge the sample, separate the plasma from the cells and snap freeze (-200C) the plasma.

Stability: Snap frozen plasma is viable for 6 months.

Causes for Rejection: QNS, clotted, severely hemolyzed specimen, specimen greater than 4 hours old, wrong tube (3.8% sodium citrate), high hematocrit (> 55%), identification error, sample processed/transported, and/or stored improperly.
Clinical Information:

Interfering Substances:  Heparin, Coumadin
Reference Range:

Negative (Correction of the patient’s PT and/or aPTT by the addition of Pooled Normal Plasma)
Note:

 
CPT 4 Code:

 85335
12-2-2011 Reviewed:  M. Abad, MLS (ASCP)CM, SH

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient.  Components of the organ or disease panels may be ordered individually.  The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-9 code or its verbal equivalent.

 

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