Austin Pathology
Test Directory
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Cortisol - Serum
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Ordering Information
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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.
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Laboratory
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Biochemistry
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Specimen
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Blood
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Container
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Serum tube (gold top)
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Additional Collection Instructions
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Can combine with other Chemistry tests requiring same tube type.
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Minimum Adult Volume
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5mL
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Minimum Paediatric Volume
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1mL
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Frequency
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Daily
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Reference Interval
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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: Males and Females (not on OCP): 460 nmol/L Females on OCP: 600 nmol/L Source: ESA/AACB/RCPA HEDT Guideline. |
These PDF documents can be downloaded for your reference
