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diurnal variation

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diurnal variation,
1 the range of the output or excretion rate of a substance in a specimen being collected for laboratory analysis over a 24-hour period.
2 expected high and low levels of a substance during a 24-hour period. For example, blood cortisol is highest in the morning and lowest in the early evening.


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Diurnal variation in the metabolism of S-carboxymethyl-L-cysteine in humans.
Efficacy of S-carboxymethyl-L-cysteine for otitis media with effusion by Mitchell, S.C. / Ear, Nose and Throat Journal
The uncompensated diurnal variations of the time delay between the two sites were about 140 ps, and can be controlled well below this level.
AN OPTICAL-FIBER NETWORK FOR FREQUENCY COMPARISONS ESTABLISHED IN ... by Journal of Research of the National Institute of Standards and Technology
The influence of diurnal variation is another concern with any serum analysis that might last longer than 24 hours.
Phonophoretic delivery of 10% hydrocortisone through the epidermis of ... by Echternach, John L. / Physical Therapy
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