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HEMATOCRIT (089-0018) Synonyms: HCT, CRIT CPT 4 Code: 85014 (Limited Coverage Test (NCD) Test Order Mnemonic: HCT Test Includes: Hematocrit Lab: Hematopathology Applies To: Monitoring hematological status when Complete Blood Count (CBC) parameters are not required. Request Form: Hematology A Collection: Venipuncture preferred; Micro-collection acceptable. Storage Instructions: Stable at Room Temperature for 24 hours. Stable Refrigerated for 36 hours. Cause For Rejection: Clotted, QNS, identification error, hemolysis Availability: Samples are accepted 24 hours per day at Sample Management, 5.136 McCullough Turnaround Time: STAT: 1 hour; Routine: 4 hours Special Instructions: ECMO specimens should be delivered directly to the Hematopathology lab (5.142 McCullough) Specimen: Blood Volume: 2 ml Minimum Volume: 1 mL (0.5 mL in extreme emergency) Container: EDTA (Lavender-top tube) Reference Ranges: Age/Sex Related (See patient chart) Critical Values: < 21.0% (newborns); < 15.0% (children/adult) Test Method: Part of an automated multi-parameter counting of red blood cells (RBC) using electronic resistance detection enhanced by hydrodynamic focusing. The hematocrit is measured utilizing cumulative pulse height detection. Interfering Substances: Clots or fibrin strands; inappropriate anticoagulant; extremely elevated WBC counts; sickle cells; hemolysis; electrolyte imbalances; warm or cold agglutinins; elevated plasma lipids; elevated chylomicrons; elevated bilirubin; elevated serum urea nitrogen. Reviewed 10/10/07 by L. Emanuel, MT(ASCP) |
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