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Geisinger Medical Laboratories Test Catalog
COMPLEMENT C4 |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB2064 Geisinger Epic ID: 14838 | |
SPECIMEN COLLECTION |
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Specimen type: |
Plasma or Serum | |
Preferred collection container: |
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Specimen required: |
2 mL of serum or plasma; minimum 0.2 mL. | |
Patient preparation: |
Fasting specimen preferred. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Allow serum to clot. Centrifuge to separate serum or plasma within 2 hours of collection. | |
Transport temperature: |
Refrigerated (preferred). Room temperature specimen also acceptable. | |
Specimen stability: |
Room temperature: 2 days. Refrigerated: 8 days. Frozen: 3 months. | |
Rejection criteria: |
Stability limits exceeded. | |
TEST DETAILS |
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Reference interval: |
10-40 mg/dL | |
CPT code(s): |
86160 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Test includes: |
Complement C4. | |
Methodology: |
Immunoturbidity |
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Synonyms: |
C4
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Clinical significance: |
Decreased C4 level is associated with acute systemic lupus erythematosus, glomerulonephritis, immune complex disease, cryoglobulinemia, congenital C4 deficiency and generalized autoimmune disease. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |