Apolipoprotein A-1
Also known as: APO A-1
Use
Apolipoprotein A-1 is a protein component of high-density lipoprotein (HDL), which is instrumental in the transport of cholesterol from tissues to the liver for excretion. Measuring apo A-1 levels is useful in assessing cardiovascular risk and is often used in conjunction with other lipid panel tests. Lower levels of apo A-1 are associated with an increased risk of cardiovascular disease.
Special Instructions
The specimen should be freshly drawn and fasting. It is important that serum or plasma be separated from cells as soon as possible, preferably within two hours of collection, to ensure accurate results.
Limitations
The test may not accurately reflect small changes in apolipoprotein A-1 levels over very short time spans due to normal biological variability. Hemolysis or improper handling of the specimen may affect the validity of results. The test is also not intended to be used as a stand-alone diagnostic tool without consideration of other clinical and laboratory findings.
New York Approved
Methodology
Immunoassay (Immunoturbidimetry)
Biomarkers
LOINC Codes
- 1869-7
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL
Minimum Volume
0.5 mL
Container
Serum separator tube, plasma separator tube, K2EDTA, lithium heparin.
Collection Instructions
Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection.
Patient Preparation
Freshly drawn fasting specimen.
Storage Instructions
Refrigerated.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 24 hours |
| Refrigerated | 8 days |
| Frozen | 2 months |