Prekallikrein
Test Mnemonic
PREKAL
CPT Codes
- 85292 - QTY (1)
Aliases
- Fletcher Factor
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 2 mL | Plasma | Sodium citrate (Lt. Blue) | Frozen | Separate plasma from cells ASAP. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 4 hours |
| Refrigerated | 4 hours |
| Frozen | 2 weeks |
Days Performed
Tue
Turnaround Time
2 - 9 days
Methodology
| Name | Description |
|---|---|
| Clotting Assay |
Reference Range
| Prekallikrein | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Normal | 55-207 | % |
Special Info
Patient preparation: Discontinue coumadin for 2 weeks prior to collection; discontinue heparin for 2 days prior to collection. 3.2% sodium citrate is the preferred anticoagulant recommended by NCCLS. Do not use needles <23 gauge. Do not leave the tourniquet on for an extended period of time before drawing the sample. Draw a discard tube (non-additive or light blue) before collecting the prekallikrein specimen. Discard the first tube.
Clinical Info
To diagnose a factor deficiency in a patient with a prolonged PTT and normal PT.