Professional
Technical
IVT
day-of-life adjustment
Modification of reference ranges based on the infant's age at specimen collection.
Full Definition
Day-of-life adjustment involves modifying screening cutoff values and reference ranges based on the specific age of the infant when the specimen was collected. Many analytes change predictably in the first days of life due to physiological adaptations, feeding establishment, and metabolic maturation. These adjustments help distinguish normal developmental changes from pathological elevations, reducing false positive rates while maintaining sensitivity.
Usage
Usage note: Age is typically calculated from birth time to collection time in hours or days.
In Context
- "Day-of-life adjustment indicated the TSH level was normal for a 36-hour-old infant." — Result interpretation
- "The screening algorithm incorporates day-of-life adjustments for all endocrine markers." — Laboratory protocol
Also known as
age-adjusted cutoffs
Don't confuse with
gestational age adjustment
birth weight adjustment