This site and the people on it are wonderful and so educational.  I
learn something new all the time.  Jane's comment sent me scrambling
and yes... medically,  tds does stand for three times per day as does
tid per Wikipedia list of shorthand prescription terms.....

http://en.wikipedia.org/wiki/List_of_abbreviations_used_in_medical_prescriptions
t.d.s. - ter die sumendum - three times a day
t.i.d. - ter in die -  three times a day
t.i.w.   - three times a week mistaken for twice a week
top.   - topical
T.P.N.  -  total parenteral nutrition
tr, tinc., tinct. -    tincture

Now I will be able to figure out what the doctor is conveying to the
pharmacist on the rare RX's I get from now on..lol       Lola

On Thu, Mar 15, 2012 at 11:57 AM, Marshall <[email protected]> wrote:
> Wouldn't three times a day be TDD, and TDS be three times a second?  I
> assume TDS is total dissolved solids, and in that case .1 uS is close to .1
> TDS, depending on what the solids are, and assuming they are ionic.
>
> Marshall
>
>
> On 3/14/2012 11:08 PM, Jane MacRoss wrote:
>
> Parts per million, three times a day
>
>
>
> What does that mean in PPM TDS?
>
>


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