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HelpTest Code F2ISO F2-Isoprostanes, Random, Urine
Reporting Name
F2-Isoprostanes, UUseful For
Assessment of in vivo lipid peroxidation
Considered to be an index of systemic oxidative stress over time
Additional Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| CRETR | Creatinine, Random, U | No | Yes |
Testing Algorithm
When F2-isoprostanes testing is performed, urine creatinine will always be performed at an additional charge.
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineSpecimen Required
Patient Preparation: Patient should not take nonsteroidal anti-inflammatory drugs within the 72 hours or aspirin within the 2 weeks prior to specimen collection.
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic urine tube
Specimen Volume: 5 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 7 days | |
| Frozen | 30 days | ||
| Ambient | 7 days |
Reference Values
≥18 years: ≤1.0 ng/mg creatinine
Reference values have not been established for patients who are younger than 18 years of age
Day(s) Performed
Tuesday
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82542
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| F2ISO | F2-Isoprostanes, U | 90783-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 88677 | 15-F2t-Isoprostane, U | 90783-2 |
Clinical Information
Oxidative stress results from an imbalance of reactive oxygen species resulting in peroxidation of biomolecules. 15-F2t-isoprostane (F2ISO, also referred to as 8-iso-PGF2alpha or 8-isoprostane) is an F2-isoprostane and its measurement is considered the "gold standard†test for quantifying lipid peroxidation in vivo. F2ISO is a potent vasoconstrictor, induces vascular smooth muscle cell proliferation, and increased aspirin resistance to platelet aggregation. Elevated urinary F2ISO concentrations are associated with the presence and extent of coronary artery stenosis, peripheral artery disease, and increased risk of post-operative atrial fibrillation.
Urinary F2ISO concentrations are lowered by aerobic exercise training, smoking cessation, and fenofibrate therapy.
Interpretation
Elevated urinary F2-isoprostanes reflect widespread oxidative stress and systemic burden of lipid peroxidation end products. Quantitation of F2-isoprostanes in urine is highly dependent upon the methodology utilized; however, mass spectrometry methods (gas chromatography-mass spectrometry or liquid chromatography-tandem mass spectrometry) assays yield superior sensitivity and analytical specificity compared with immunoassays.
F2-isoprostanes demonstrate superior clinical sensitivity compared to other oxidative stress biomarkers but lack clinical specificity for any particular disease. Pharmacological treatment with antioxidant supplementation, hypoglycemic agents in diabetes, smoking cessation, and weight reduction have all been shown to decrease production of F2-isoprostanes.
Cautions
Patients should not take nonsteroidal anti-inflammatory drugs within 72 hours or aspirin within 2 weeks prior to providing a urine specimen for analysis.
Report Available
2 to 9 daysReject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Method Name
F2ISO: Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
CRETR: Enzymatic Colorimetric Assay
Forms
If not ordering electronically, complete, print, and send a Cardiovascular Test Request Form (T724) with the specimen.