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Why do doctors recommend an ESR test during an infection? What high or low ESR levels mean

The Erythrocyte Sedimentation Rate (ESR) test measures how quickly red blood cells (RBCs) settle at the bottom of a test tube within one hour. It is a simple, routine test suitable for people of all ...
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What is ESR and how can high levels be managed?

My 27 years old husband was suffering from para-typhoid A fever. The doctor had a test done for ESR, which was 90mm/1hr. The ESR rate was high, is this due to fever? What causes increased ESR level?