|Epic Lab Code:||LAB3176|
|Downtime Form:||A-1a Miscellaneous Request|
|Red top tube 5 mL (Clot Activator)|
Reference values have not been established for patients that are <16 years of age.
Evaluation of metabolic status of persons with endocrinopathies
Detection of pheochromocytoma and of glucagon-, thyrotropin-, and adrenocorticotropin-secreting tumors
Monitoring of control of diabetes mellitus (serum-free glycerol is a very useful companion test in assessing diabetes and may be ordered by special request from Mayo Medical Laboratories). The correlation with insulin resistance and downstream cardiovascular risk may be a useful treatment aid in some patients.
Patient should fast for 12 to 14 hours; however, in prolonged fasting or starvation, free fatty acid levels rise as much as 3-fold.
Patient should abstain from alcohol for at least 24 hours.
In order to eliminate the generation of free fatty acids from triglycerides by serum lipases (causing erroneous elevations), serum should be frozen soon after it is drawn and shipped frozen.