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

Plasma: Green lithium heparin, green sodium heparin, or lavender EDTA
Serum: Red top

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

Methodology

Chemiluminescence
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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
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Performing Laboratory

Warde Medical Laboratory
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