westgard quality control

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7 Terms

1
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1-2s

One control observation, exceeding the mean, this rule may be used as a warning rule

<p>One control observation, exceeding the mean, this rule may be used as a <strong><mark data-color="yellow" style="background-color: yellow; color: inherit">warning</mark></strong><span style="color: yellow"><strong><mark data-color="yellow" style="background-color: yellow; color: inherit"> </mark></strong></span><strong><mark data-color="yellow" style="background-color: yellow; color: inherit">rule</mark></strong></p>
2
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1-3s

One control observations exceeding the mean recommended rejecting patient results. This rule is sensitive to Random error

<p>One control observations exceeding the mean recommended rejecting patient results. This rule is sensitive to <strong><mark data-color="blue" style="background-color: blue; color: inherit">Random error</mark></strong></p>
3
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2-2s

Two consecutive control observations exceeding the same mean plus 2S or Mean minus 2s Limit recommended rejecting patient results this rule is sensitive to systemic error

<p>Two consecutive control observations exceeding the same mean plus 2S or Mean minus 2s Limit recommended rejecting patient results this rule is sensitive to <strong><mark data-color="green" style="background-color: green; color: inherit">systemic error</mark></strong></p>
4
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R- 4 s

One observation exceeding the mean, plus 2S and another exceeding the mean minus 2S within a run not between runs recommend rejecting patients. This rule is sensitive to a random error

<p>One observation exceeding the mean, plus 2S and another exceeding the mean minus 2S within a run not between runs recommend rejecting patients. This rule is sensitive to a <strong><mark data-color="purple" style="background-color: purple; color: inherit">random error</mark></strong></p>
5
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4- 1 s

4 consecutive observations exceeding the mean plus 1s or the mean minus one S recommended rejecting patients results. This rule is sensitive to systemic error.

<p>4 consecutive observations exceeding the mean plus 1s or the mean minus one S recommended rejecting patients results. This rule is sensitive to <strong><mark data-color="red" style="background-color: red; color: inherit">systemic</mark></strong><span style="color: purple"><strong><mark data-color="red" style="background-color: red; color: inherit"> </mark></strong></span><strong><mark data-color="red" style="background-color: red; color: inherit">error.</mark></strong></p>
6
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10 x

10 consecutive control observations falling on one side of the mean above or below with no other requirement on size of the deviations recommend rejecting patient results. This rule is sensitive to systemic error.

<p>10 consecutive control observations falling on one side of the mean above or below with no other requirement on size of the deviations recommend rejecting patient results. This rule is sensitive to<span style="color: red"><strong> </strong></span><strong><mark data-color="red" style="background-color: red; color: inherit">systemic</mark></strong><span style="color: red"><strong><mark data-color="red" style="background-color: red; color: inherit"> </mark></strong></span><strong><mark data-color="red" style="background-color: red; color: inherit">error</mark></strong><span style="color: red"><strong>.</strong></span></p>
7
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7t

Reject run whenever control measurements trend in the same direction get progressively higher or lower