Test ID: FCBGC
Cortisol, Free, Serum
Reference Values 
Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
Corticosteroid Binding Globulin (CBG)* (mg/dL)
Age Range
Pediatric ranges not established.
Adults 1.7 – 3.1
Free Cortisol, Serum (ug/dL)
Age Range
Prepubertal Females 8:00 AM 0-9y 0.1-1.2
Prepubertal Males 8:00 AM 0-10y 0.1-1.2
Adults 8:00 AM 0.2-1.8
Percent Free Cortisol, Serum (%)
Age Range
Prepubertal Females 8:00 AM 0-9y 0.8-3.4
Prepubertal Males 8:00 AM 0-10y 0.8-3.4
Adults 8:00 AM 2.3-9.5
Cortisol, Serum (ug/dL)
Age Range
Premature (26-28w) Day 4 1.0-11
Premature (31-35w) Day 4 2.5-9.1
Full-term Day 3 1.7-14
Full-term Day 7 2.0-11
31d-11m 2.8-23
12m-15y (8:00 AM) 3.0-21
Adults
8:00 AM 8.0-19
4:00 PM 4.0-11
Test Performed By: Esoterix Endocrinology
4301 Lost Hills Road
Calabasas Hills, CA 91301
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