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Message: <blockquote data-quote="tareload" data-source="post: 218321">Here's what I summarized from your above posts:<table class='post-table ' style='width: 100%'><tr><td >Hb measured</td><td >calc Hct (3x Hb)</td><td >Hct measured</td><td >Difference</td><td >MCHC</td></tr><tr><td > 18.8</td><td > 56.4</td><td > 53.2</td><td > 3.2</td><td > 0.353</td></tr><tr><td > 17.8</td><td > 53.4</td><td > 50.8</td><td > 2.6</td><td > 0.350</td></tr><tr><td > 18.1</td><td > 54.3</td><td > 52</td><td > 2.3</td><td > 0.348</td></tr></table>Now go back to the article I shared with you:[ATTACH=full]19933[/ATTACH]Your MCHC is not exactly 33.3333333333.......%.  The rule of 3 assume MCHC of 1/3 (33.3333333......%).  Yours is actually ~35% and consistent.  Hence, your deviation from the rule of 3 is to be expected and your MCHC is within the reference range.  The more your MCHC differs from 1/3 and the higher your Hb, the more your measured Hct will deviate from rule of 3 above.If you want some practice examples here's the applicable parts of my last two CBCs:[ATTACH=full]19934[/ATTACH]How do the calculated rule of 3 Hcts differ from the measured values?</blockquote>