How to determine Standard Deviation for ACT?

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How can I determine the SD for ACT? CAP says +/- 3 SD but how do I know what the SD is? 

Situation: Cath Lab has two i-stat devices. They questioned the results of one, so in addition to QC, I had them run patient correlation. Just trying to determine what the exact number is that they need to be within. 

Thank you!

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Total Allowable Error Covert from SD to % error.pdf
I was given this several years ago...see page 3

That's a great resource Glyne.  
I was always taught to look at a recent PT survey and select the SD of the result closest to the data you are looking at. Then determine 3 SD. The resource above says to use the median SD. 

That is a great resource, Glyne! I'm going to review our SD evaluations. 

Happy Monday :)

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