Test Details
Mnemonic
CTX
Ordering Code
3422320
CPT-4 Code(s)
82523
Specimen Information
Collect
Serum separator tube (SST)
Specimen Preparation
Centrifuge, separate serum from cells and send 1.0 mL serum frozen in a screw capped plastic vial.
Alternate Specimen
Serum: Red top
Plasma: Green lithium heparin, green sodium heparin, or lavender EDTA
Plasma: Green lithium heparin, green sodium heparin, or lavender EDTA
Minimum Volume
0.5 mL
Transport Temperature
Frozen
Rejection Criteria
Grossly lipemic, moderately hemolyzed, grossly icteric
Stability
Room temperature: Unacceptable
Refrigerated: 72 hours
Frozen: 3 months
Refrigerated: 72 hours
Frozen: 3 months
Methodology
Chemiluminescence
Reference Range
Reference range for males:
18 - 30 years: 72 - 1,395 pg/mL
31 - 50 years: 46 - 787 pg/mL
51 - 70 years: 34 - 896 pg/mL
>70 years: Not established
Reference range for females:
Premenopausal: 39 - 623 pg/mL
Postmenopausal: 51 - 1,296 pg/mL
18 - 30 years: 72 - 1,395 pg/mL
31 - 50 years: 46 - 787 pg/mL
51 - 70 years: 34 - 896 pg/mL
>70 years: Not established
Reference range for females:
Premenopausal: 39 - 623 pg/mL
Postmenopausal: 51 - 1,296 pg/mL
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
Yes