Bill,

The typical range of PSA is zero to about 15 or 20 micrograms per deciliter.

The 15 to 20 range is considered to be a possible indication
of prostate cancer, and usually triggers a biopsy of prostate tissue for 
microscopic examination.

Deciliter in the denominator is conventional medical practice in which 
"convenient numerical values" are considered more valuable than coherence of 
units.  The same is true for grams and mg in medical practice.

Gene.

---- Original message ----
>Date: Sat, 26 Jan 2008 16:43:42 -0500
>From: Bill Hooper <[EMAIL PROTECTED]>  
>Subject: Re: [USMA:40228] Concentrations  
>To: [EMAIL PROTECTED]
>...
 
>     Prostate Specific Antigen (PSA) is measured in
>     micrograms per deciliter.
>
>   That's one of the places I think "deci-" should be
>   avoided. There's no reason it can't be reported in
>   µg/L...

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