INHIBITOR SCREEN (089-0006)

CPT 4 Code: 85335

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

Test Order Mnemonic: INHSCR

Request Form: Hematology A

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

Storage Instructions: Viable for 4 hours at room temperature.   If time from draw to receipt in the laboratory is to be greater than 4 hours, centrifuge the specimen; remove the plasma from red cells and snap freeze (-70°C) plasma. Snap frozen plasma is viable indefinitely.

Causes for Rejection: QNS, clotted, severely hemolyzed specimen, specimen greater than 4 hours old, identification error, sample processed and/or stored improperly.

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

Turnaround Time: 4 hours

Special Instructions: Deliver sample to lab within ½ hour for best results.  Accepted up to four hours from draw.

Specimen: Blood

Volume: 4.5 mL blood

Minimum Volume:  Call Lab

Container: 3.2% Sodium citrate tube (light Blue top tube)

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

Test Method:  Electromagnetic Viscosity Detection

Interfering Substances:  Heparin, Coumadin

Revised 10/10/07 by W.Russo, MT(ASCP)