How does pregnancy affect lab results in rheumatoid arthritis (RA)?

Updated: Feb 07, 2020
  • Author: Howard R Smith, MD; Chief Editor: Herbert S Diamond, MD  more...
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Answer

RA often goes into remission during pregnancy. The presence of RF neither helps predict nor correlates with the outcome of arthritis during pregnancy. The ESR cannot be used to assess RA disease activity during pregnancy, because pregnancy alters the normal values. The volume expansion that occurs during pregnancy can result in lower hematocrit values.


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