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- The American College of Rheumatology developed diagnostic criteria for LCV. Patients must meet at least three of the four criteria: 1) Older than 16 years of age 2) Use of a drug before symptoms developed 3) Skin rash is present 4) A skin biopsy shows neutrophils (type of white blood cell) around a small blood vessel.
- Skin biopsy: A skin biopsy is most often performed to confirm a diagnosis. During the procedure, a small sample of skin tissue is removed and analyzed under a microscope in a laboratory. The analysis will determine whether vasculitis is present.
- ESR: An erythrocyte sedimentation rate (ESR) test may be conducted to monitor the patient's condition. The one–hour test measures the distance (in millimeters) that red blood cells settle in unclotted blood toward the bottom of a test tube.
- Urine sample: A physician can detect kidney inflammation after evaluating a urine sample. Kidney inflammation is indicated when the urine contains a small amount of blood or protein.
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