This is my experience also.
Gareth Davies
>----------
>From: Sena, Salvador, Ph.D. (DHSMAILUSERS)[SMTP:[log in to unmask]]
>Sent: 05 November 1998 23:15
>To: Paul Eldridge
>Cc: ACB Mailbase
>Subject: RE: Sweat Tests
>
>We also use the Macro-Duct device and occasionally have problems obtaining
>adequate sweat from either arm (we routinely collect samples from both
>arms). In these cases, our usual practice is to have the patient come back
>in a week and tell the parent(s) to make sure the child is well hydrated.
>We are usually successful on our second try, although there have been some
>who require a third visit. Some patients just seem to be "poor sweaters"!
>I can't say that we've noticed an excess of difficult cases recently, nor
>have we noticed the increased frequency you mentioned with Afro-Carribean
>and Asians. If the electronics check out OK, could there possibly be a
>problem with the pilocarpine gels (storage conditions, exp. date, etc.)?
>Have you tried alternate sites, i.e. legs?
>
>Sal Sena
>Danbury, CT USA
> ----------
>From: Paul Eldridge
>To: acb-clin-chem-gen
>Subject: Sweat Tests
>Date: Tuesday, November 03, 1998 7:30PM
>
>We have been experiencing problems with inadequate sweat collection in the
>past few months. Our equipment, clinic room and protocols have not changed
>for some years. The equipment has been checked by the electronics
>department. We use standard pilocarpine iontophoresis sweat induction
>followed by collection with the Wescor Macroduct . I prefer the Wescor
>product because the lab staff find it simpler and it avoids the errors
>frequently experienced with weighings and calculations when using the
>traditional filter paper collection. The problem seems more frequent with
>Afro-Carribeans and Asians than with white Europeans. Comments and advice
>appreciated.
>
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