fasting specimen

fasting specimen

Lab medicine A blood specimen drawn from a Pt who has not eaten for 12 hrs; fasting is an absolute requirement for a limited number of tests–eg, GTT; prolonged fasting causes a marked–240% ↑ in bilirubin, ↑ plasma TGs, glycerol and free fatty acids, and a marked–± 50% ↓ in glucose. See Glucose tolerance test.
References in periodicals archive ?
Because nonfasting specimens often contain traces of chylomicrons, calculation requires a fasting specimen (ideally >12 h).
Note that all methods comparisons to date have used fasting specimens.
A basal-state lipid profile fasting specimen determined by fasting overnight for nine to 12 hours is recommended for collection of a specimen for measurement of the lipid profile of total cholesterol, triglyceride, and HDL cholesterol, mainly because of the highly variable triglyceride diurnal variation.
We collect the specimen early in the day to get as close to a fasting specimen as possible.
Triglyceride values are also used to calculate LDL cholesterol (LDL-C) by difference using the Friedewald equation, which was derived using fasting specimens.
Fasting specimens must be collected after a 10- to 12-hour complete dietary restriction of everything except water and medications.
Our study was designed to determine the magnitude of changes induced by deviating from the recommended and standardized procedures of collecting fasting specimens early in the morning.
The Friedewald formula provides an adequate estimate of LDL-cholesterol for most fasting specimens but is known to be less reliable as triglyceride concentration increases [5].
With plasma, only fasting specimens should be used for assessing AA status.
6 [micro]mol/L, based upon fasting specimens (n = 20).