Human Chorionic Gonadotropin (HCG)

CPT Code:  

84702 

Specimen: 

Serum or Plasma 

Volume: 

0.8 mL 

Minimum Volume: 

0.3 mL (Note: This volume does not allow for repeat testing.) 

Container: 

Red-top tube or gel-barrier tube

Methodology: 

Immunoassay

Collection: 

If a red-top tube is used, transfer separated serum to a plastic transport tube.

Specimen should be free of particulate matter. To prevent the appearance of fibrin in serum samples, complete clot formation should take place before centrifugation. If clotting time is increased due to thrombolytic or anticoagulant therapy, the use of plasma specimen will allow for faster sample processing and reduce the risk of particulate matter.

Blood collected in the presence of oxalate potentially can cause clumping of chrome particles and should not be used.

Frozen plasma samples with insufficient anticoagulants potentially can cause clumping of chrome particles and should not be used.

Reference Range:   

 Stability:

Temperatures  Period 
Room Temperature  24 Hours 
Refrigerated (2-8 ⁰C)  48 Hours 
Frozen (-20 ⁰C)  2 Months 
Mix thoroughly after thawing. Avoid repeated freezing and thawing.

 

Use: 

This test can be used for the early detection of and on-going monitoring of pregnancy. Determine the presence of hCG in patients with gestational trophoblastic disease; evaluate and monitor male patients with testicular tumors; follow up molar pregnancy. 

Causes for Rejection:  Citrate plasma specimen; improper labeling