Talk:French catheter scale

Somebody know where I can find mor infirmation from this issue? Thanks to all.

very confusing
I find the description very confusing. according to what is written here, the French scale gives the circumference and to get the diameter, one divides the French size by pi (3.14159 ...). This does not agree with the conversion table given in the attached picture. The scaling factor is more like F = 3 * mm. Does anybody agree ?


 * I agree, this is somewhat confusing. It's as though it was written by someone who either doesn't know the subject matter very well, or doesn't quite know how to write clearly. Perhaps this is a result of sloppy editing...? —Preceding unsigned comment added by 71.239.133.107 (talk) 17:25, 18 September 2007 (UTC)


 * I also agree the article is very confusing and in contradiction to information I have learned... In respiratory care we frequently use catheters which come in French sizes, we were taught the conversion is (French/3.14)*2... so a 14fr would be 8.9mm or 9mm...

I think the description is perfectly clear. Fr measures diameter, NOT circumference. I just verified this with the engineers around here (a medical device company; we make catheters in this department). —Preceding unsigned comment added by 65.173.1.45 (talk) 20:28, 7 May 2008 (UTC)

The chart page is redundant- the graphic contains all of the info needed. The reference to the circumference is just plain wrong- the definition is 3 times the OUTSIDE diameter in millimeters, rounded to the nearest whole number. You will sometimes see things like 7.5 Fr, which makes me crazy. Sorry, doctors are not engineers! —Preceding unsigned comment added by Wa9kws (talk • contribs) 20:25, 12 September 2008 (UTC)

merger proposal

 * Merged --Moonriddengirl (talk) 15:37, 31 January 2010 (UTC)

Can't see any reason to have two separate pages, one just for the chart: French catheter scale chart. Saint|swithin 08:54, 30 June 2008 (UTC)
 * Support merge. - Draeco (talk) 17:20, 30 June 2008 (UTC)
 * Support merge. Makes perfect sense to me. ForestAngel (talk) 10:54, 6 September 2008 (UTC)
 * Support merge. Unnecessary duplication of information (in part wrong). Urh (talk) 20:18, 12 November 2008 (UTC)
 * Support merge. It's obvious from the comments above that there's confusion; the information should be corrected and the scake page merged or deleted [the information is redundant].74.178.58.220 (talk) 18:30, 24 December 2008 (UTC)
 * Support merge. The scale looks like it would be better suited as being part of this page. madkayaker (talk) 14:15, 20 March 2009 (UTC)
 * Support merge. Having the chart on the same page could help clear confusion. PhysicsPat (talk) 06:12, 3 September 2009 (UTC)

Where's the inner diameter?
I cannot believe how hard it is to find the lumen (inner diameter) of these catheters and cannulas. The inner diameter determines the flow rate. What are the inner and outer diameters? 162.207.203.26 (talk) 17:50, 7 April 2020 (UTC)