Search in the bar above for available tests. Type any letter of the alphabet to be presented with all available results for that letter.
Cortisol - Serum
Ordering Information
Significant diurnal variation occurs in the circulating cortisol concentration, so a single blood sample is of limited value. Peak values occur between 0800 - 1000hrs, and trough values occur in the late afternoon and evening.
Laboratory
Biochemistry
Specimen
Blood
Container
Serum tube (gold cap OR red cap w. yellow insert)
Additional Collection Instructions
Can combine with other Biochemistry tests requiring same tube type.
Minimum Adult Volume
5mL
Minimum Paediatric Volume
1mL
Frequency
Daily
Reference Interval
Collection
Reference Interval (nmol/L)
(AM) 06:00 - 10:00
185 - 624
(PM) 16:00 - 20:00
< 276
Source: Beckman-Coulter.
For the Beckman cortisol assay, the minimum peak cortisol cut-off (2.5th centile) for healthy subjects 30 mins post IV Synacthen is:
