What Does Positive Rheumatoid Factor And Elevated ESR Mean?

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Alternative Names

Erythrocyte sedimentation rate; Sed rate; Sedimentation rate


Normal Values

Adults (Westergren method):

  • Men under 50 years old: less than 15 mm/hr
  • Men over 50 years old: less than 20 mm/hr
  • Women under 50 years old: less than 20 mm/hr
  • Women over 50 years old: less than 30 mm/hr

Children (Westergren method):

  • Newborn: 0 to 2 mm/hr
  • Neonatal to puberty: 3 to 13 mm/hr

Note: mm/hr. = millimeters per hour


What abnormal results mean

An increased ESR rate may be due to:

  • Anemia
  • Endocarditis
  • Kidney disease
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