|Available:||Daily, 24 hours.|
|Turnaround:||Routine 3 hours; Stat 30 minutes.|
|Container:||Red top tube|
|Uses:||C4 is decreased in disseminated intravascular coagulation, acute glomerular nephritis, chronic hepatitis, and SLE. C4 is increased in acute inflammatory processes and in malignancies.|
|Limitations:||Test is not sensitive enough to pick up levels in body fluids other than serum. Measures both biologically active and inactive C4.|
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