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partial thromboplastin time, mixing study
Synonyms: PTT Mixing Study 
Computer Code: MPTT
Specimen Collection: Three 2.7 mL blue top tubes. Transport to lab within 3 hours. 
Minimum Volume: two 2.7 mL 
Handling Instructions for Offsite Areas: Maintain at room temperature. If specimen cannot be transported within 2 hours, centrifuge at 3,000 rpm for 20 minutes. Using a plastic pipette, transfer plasma to plastic tube and freeze plasma. 
Reference Values: Test to differentiate whether an abnormal PTT is due to a factor deficiency or an inhibitor.  
Lab Code: HEM 
Requisition: C/H
Test Frequency: Daily 
Routine TAT: 4 hr 
Stat TAT: contact lab 
CPT Code(s): 856730x2, 85732 
LCD or NCD: (NCD) http://www.cms.hhs.gov/mcd/index_section.asp?ncd_sections=40 
Methodology Used: 55
See Addendum XVII

Albany Medical Center
43 New Scotland Avenue
Albany, NY, 12208
Date: 04/24/2014
Time: 22:45:55 (24hr)