Temperature Correction

The International Council for Standardisation in Haematology and the Clinical Laboratory Standards Institute both recommend that the Erythrocyte Sedimentation Rate (Sed Rate) test be performed within the temperature range 64 to 77 °F. 

However, it is understood that these temperatures may be exceeded in laboratories in some parts of the world where temperature control of the environment is not available or may have broken down. 

Personnel performing the test must always keep a record of the temperature at the start of the timed hour and at the end when reading the result - thus being able to calculate and record an average temperature over the testing period. 

If the average temperature thus obtained is at or above 77 °F the observed result should be corrected for temperature using the chart or nomogram devised by Roger W Manley and published in the Journal of Clinical Pathology in 1957; Volume 10, pages 354 - 356. 

 

Please download the Nomogram and instructions for use from the link. Please read all the instructions for use below carefully before you begin.

Note: This nomogram applies only to the Westergren Method of ESR estimation, the Wintrobe method requires a different chart and most automated systems have a correction system built into the software. 

 

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