1:1 Mix_PTT
General Information
- Lab Name
- 1:1 Mix_PTT
- Lab Code
- PTTX1P
- Epic Ordering
- 1:1 MIX_PTT
- Description
A Partial Thromboplastin Time (PTT) mixing study is ordered to evaluate the prolongation of PTT only. It is used to distinguish the cause of prolonged PTT due to factor deficiency or inhibitor. A 1:1 mix of the patient's plasma and normal pooled plasma is performed and the PTT is measured again. If the PTT corrects, this suggests a factor deficiency. If the PTT does not correct, this suggests presence of an inhibitor. A mixing study interpretation may direct further coagulation testing.
- Synonyms
- Mix-PTT 1:1, Partial Thromboplastin Time-MIX
- Components
-
Code Name PTTMX1 1:1 Mix_PTT PTTPT PTT Patient PTTNOR PTT Normal Pool PTTMIX PTT 1:1 Mix Immediate INCMIX PTT 1:1 Mix Incubated PTTCOM PTT 1:1 Mix Comment XMIX 1:1 Mix, 2nd tube
Interpretation
- Method
Clot based
- Reference Range
- See individual components
- Ref. Range Notes
For interpretation contact the Lab Med Resident on-call through the paging operator at 206-598-6190.
Ordering & Collection
- Specimen Type
- Blood
- Collection
-
Two 3 mL plastic BLUE TOP (Citrate) Tubes
- Handling Instructions
The Laboratory MUST process specimen, within 6 hrs of blood collection.
Processing
- Processing
UW-MT and HMC: Take specimen to the Coag bench for processing.
Outside Laboratory: Centrifuge for 10 minutes, remove plasma & re-spin plasma for another 10 minutes. Decant & Freeze plasma (minimum 2.0 mL) @ -20°C to -80°C. Send frozen on dry ice.
Performance
- LIS Dept Code
- Performing Location(s)
-
HMC Coagulation
206-520-4600325 9th Ave, Rm # GWH-47, Seattle, WA 98104-2420
UW-MT Coagulation
206-520-4600Clinical Lab, Room NW220,
University of Washington Medical Center,
1959 NE Pacific street, Seattle, WA 98195 - Frequency
- Daily
- Available STAT?
- Yes, Daily 7 am – 10 pm. For other times, contact the Lab Medicine Resident for approval.
Billing & Coding
- CPT codes
- 85730, 85732
- LOINC
- 18720-3
- Interfaced Order Code
- UOW4073