Specimen

Serum

Collection Medium:

Minimum:

Preferred minimum: 1 mL serum from red top tube
Absolute minimum: 0.5 mL serum from red top tube

Rejection Criteria:

Hemolyzed specimens

Delivery Instructions:

Deliver to laboratory immediately after collection.

Analytic Time:

1 week

Reference Range:

               RANGE       MEAN
              (ng/ml)     (ng/ml)
Prepubertal  334 - 642      488
Children:

Pubertal     245 - 737      491
Children:

Adults:      288 - 736      512

Comments:

Patient's age and sex required on requisition.  Must be processed in 
laboratory within one hour of collection.

Methodology:

Radioimmunoassay after acid:alcohol extraction

CPT Code:

83519

See also:
Insulin Like Growth Factor Binding Protein I (IGFBP-1), Serum
Insulin Like Growth Factor Binding Protein III (IGFBP-3), Serum
Insulin Like Growth Factor I (IGF-I), Serum

See Additional Information:
Specimens Requiring Immediate Delivery