AST and Platelets with APRI
Use
AST to Platelet Ratio Index (APRI) is reported to be a simple, noninvasive, and readily available laboratory test index that can stratify patients with HCV and Non-Alcoholic Fatty Liver Disease (NAFLD) who are at high or low risk for significant fibrosis and cirrhosis with high degree of accuracy.
Special Instructions
Not provided.
Limitations
Clumping may cause false low platelet count. Platelet satellitism around neutrophils will cause a pseudothrombocytopenia. RBC or WBC fragments including fragmented fragile leukemic cells and neutrophil pseudoplatelets may cause falsely elevated counts.
Methodology
Automated Analyzer
Biomarkers
LOINC Codes
- 1920-8 - AST SerPl-cCnc
- 777-3 - Platelet # Bld Auto
- 86465-2 - APRI Ser+Bld Calc-Rto
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
0.5 mL
Minimum Volume
0.5 mL
Container
Gel-barrier tube or red-top tube
Collection Instructions
Separate serum from cells within 45 minutes of collection.
Storage Instructions
Room temperature
Causes for Rejection
Serum: gross hemolysis; improper labeling
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 1 day |
| Refrigerated | 3 days |
| Frozen | Unstable |
Other tests from different labs that may be relevant