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HelpTest ID HEXP Iohexol, Plasma
Useful For
Determining glomerular filtration rate
Method Name
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Reporting Name
Iohexol, PlasmaSpecimen Type
Plasma HeparinCollection Container/Tube: Green top (heparin)
Submission Container/Tube: Plastic, 5-mL tube (Supply T465)
Specimen Volume: 1 mL
Collection Instructions: Patient should be fasting for 4 hours; 2 hours for diabetic patients.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma Heparin | Refrigerated (preferred) | 7 days |
| Frozen | 35 days |
Clinical Information
The assessment of glomerular filtration rate (GFR) is an important parameter of renal function utilized by clinicians in the care of patients with varying renal diseases, and for clinical research when precise assessment of renal function is necessary. The GFR is the sum of all the filtration rates of the individual nephrons within the kidney and, as such, reflects the number of functioning nephrons.
Reference Values
Not applicable
Cautions
A theoretical complication to injection of iodinated contrast media (one that has not been observed clinically to date) is the transient suppression of thyroid function in premature and newborn infants. Therefore, a sensitive thyrotropin test is suggested approximately 2 to 3 weeks after an iohexol clearance in that age group.
Day(s) Performed
Monday through Friday; 8 a.m.-4:30 p.m.
Report Available
3 daysPerforming Laboratory
Mayo Medical Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.CPT Code Information
82542