Complement C4, Serum
Order Name
C4
Test Number: 5000350
Revision Date 02/26/2018
Test Number: 5000350
Revision Date 02/26/2018
| Test Name | Methodology | LOINC Code |
|---|---|---|
|
Complement C4, Serum
|
Turbidometric | 4498-2 |
| SPECIMEN REQUIREMENTS | ||||
|---|---|---|---|---|
| Specimen | Specimen Volume (min) | Specimen Type | Specimen Container | Transport Environment |
| Preferred | 2mL (1mL) | Serum | Clot Activator SST | Refrigerated or Frozen |
| Alternate 1 | 2mL (1mL) | Serum | Clot Activator (Red Top, No-Gel) | Refrigerated or Frozen |
| Instructions | Separate serum from cells within one hour of collection. Stability: Room Temperature N/A, Refrigerated 7 days, Frozen 8 days. If ordering C4 with CH50, Please Collect a Red No-Gel Clot tube, freeze two separate individual aliquots for C4 and CH50. (avoid repeated freeze/thaw cycles). |
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| GENERAL INFORMATION | |
|---|---|
| Testing Schedule | Mon-Sat |
| Expected TAT | 3 Days |
| Clinical Use | Low levels may occur during infections, exacerbation of SLE and glomerulonephritis. Undetectable level suggests C4 deficiency. |
| CPT Code(s) | 86160 |
| Internal Comments | 10/23/15 changed from nephlometry to turbidometric per Patti Loykasek. 5/15/17 5/15/17 changing stability from "Room Temperature N/A, Refrigerated 5 days, Frozen 7 days." to "Room temp N/A, refrigerated 7 days, frozen 8 days" 10/20/17 SU / Stab - JK 2/26/18 add rng as alt - JK |
| Service Provided By |  |
| Lab Section | Immunology - Serology |