What is the role of lab testing in the diagnosis of systemic causes of pruritus?

Updated: Mar 03, 2020
  • Author: David F Butler, MD; Chief Editor: William D James, MD  more...
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Answer

When a primary dermatologic condition is excluded and a systemic cause is suspected, certain laboratory tests may aid diagnosis. If suspicion is low concerning a systemic disease, a 2-week trial of therapy with oilated soap for bathing, emollients for after the bath, and oral antihistamines may be attempted. If this fails, a laboratory evaluation is indicated.


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