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Lab Manual for UCSF Clinical Laboratories

Lab Manual for SFGH

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FACTOR ASSAYS (VIII, IX, XI)

Item Value
Approval req'd? PRE-APPROVAL REQUIRED. M-F, 8 am-5 pm page (415) 443-0179. After hours, week ends, and holidays contact (415) 206-8590.
Available Stat? No
Test code F8, F9, F11
Performed by? Hematology
Sendout? no
Price range $$ per factor ordered
In House Availability Monday - Friday, 9 am - 3 pm
Principle A four part assay, based on the prothrombin time or partial thromboplastin time is employed, utilizing a known factor deficient substrate. Patient's % activity is based on the activity of an assayed reference plasma.
Interpretation Factor deficiencies may be congenital or acquired, e.g., hepatic disorders, disseminated intravascular coagulation (DIC), or circulating inhibitors.
Container type citrate blue top tube
Amount to Collect 2.7 mL blood (fill tube completely)
Collection Instructions See Coagulation Procedures for instructions on collecting coagulation specimens.
Special instructions Indicate use of anticoagulant drugs on requisition slip.
Normal range Factors VIII, IX, XI: 50 - 150 %
Stability Specimen should be received in the lab within 4 hrs from collection to prevent deterioration of labile clotting factors.
References 1. Triplett, D. and Harms, C.S. Procedures for the Coagulation Laboratory. Chicago, IL: Am. Soc. of Clin. Path., 1982.

2. McPherson, RA and Pincus, MR. Henry's Clinical Diagnosis and Management. Philadelphia, PA: W.B. Saunders Co., 2007.
CPT coding 85250, 85240, 85270
Last Updated 4/27/2011 3:26:29 PM
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