 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Medical Forum / Diseases and Disorders / Prostate BPH / December 2005Grms/ccs conversion
Sorry if this is a repeat, but my prostate is 60 cc ~ what does that convert to in grms. I did a search and couldn't anything. It seems to me to ccs are referring to size and grms are referring to weight. Is this a conversion of the weight of ccs of water? Thanks for any clarification. Tom > Sorry if this is a repeat, but my prostate is 60 cc ~ what does that > convert to in grms. I did a search and couldn't anything. It seems > to me to ccs are referring to size and grms are referring to weight. Is > this a conversion of the weight of ccs of water? Thanks for any > clarification. Tom Tom...Here is a useful metric and English conversion utility that should help with at least some of the basic conversions. http://www.psinvention.com/zoetic/convert.htm Cc's are cubic centimeters, and usually a liquid volume in medicine (but could be non liquid also as in the size of your prostate). One cc equals one milli-liter (ml) in metric and when your Rx says to take a teaspoon of something liquid, you are taking approx. 5 cc's or 5 ml's (I have been to doctors who don't know that an ml is very close to a cc - duh!). Many liquid medicines (drops, etc.) have strengths that are given as so many mgs/ml - which I am sure you have seen. One ounce (English liquid volume) equals approx. 29.57 cc's or ml's. And of course an ounce is also an English weight. Go ahead and play with the table. It should be in everyone's favorites or bookmarks :-) . You can not convert cc's (volume) to grams (weight) since this gets into density factors (i.e. a cubic foot of feathers weighs a hell of lot less than a cubic foot of lead). I switched to cubic feet just to get my point across (you could have a cubic foot of either a liquid, or a solid, or a gas, or a combination thereof). The density factor for water (e.g. how many pounds per cubic foot - which varies depending on sea water, versus fresh water, versus other variables like pressure) has nothing to do with the weight or volume of your prostate per se, although your prostate consists of a large amount of water, like the rest of the human body. The uro's might have some kind of ball park drummed up conversion table for converting cc's of prostate to grams (I'll ask the next time I go), based on some arbitrary density factor for a nominal prostate (whatever the hell that may be - because everyone's prostate would be different) - but I doubt it. Didn't mean to get into all this (I hate it when that happens - lol), but I was just trying to be helpful. If you have any more questions about conversion factors, just post back and I'll try to help. Pete Thanks Pete ~ Ultrasounds can measure the size (cubic centimeters) of a prostate. How can the weight (grams) of a prostate be measured without taking it out and putting it on a scale? Tom >> Sorry if this is a repeat, but my prostate is 60 cc ~ what does that >> convert to in grms. I did a search and couldn't anything. It seems [quoted text clipped - 41 lines] > > Pete > Thanks Pete ~ Ultrasounds can measure the size (cubic centimeters) of > a prostate. I know that Tom. An ultrasound is also used by the tech to check your PVR, as you know. How can the weight (grams) of a prostate be measured > without taking it out and putting it on a scale? Tom That is a good question Tom. Make sure to ask your uro next time you go. My best guess is they use the drummed up density factor for a nominal prostate that I mentioned (e.g. so many grams per cc). It may be close to a one to one relationship. I just checked the density factor for water and it is one gram/ml, and I don't know what % of the prostate is water, but the remainder that is not water may still have a density factor close to water, if you follow me. I did a search on your previous posts. How are you doing. I hope you are improving...Pete >>> Sorry if this is a repeat, but my prostate is 60 cc ~ what does that >>> convert to in grms. I did a search and couldn't anything. It seems [quoted text clipped - 40 lines] >> questions about conversion factors, just post back and I'll try to >> help. Pete I'm not talking about a bladder scan ultrasound. I had a Renal Ultrasound that measured my "prostate volume to be 61.6 cc. The bladder is enlarged with a 669 cc prevoid volume. The postvoid volume is identical. The distal abdominal aorta is normal in caliber. No focal lesions are seen within the bladder. The kidneys appear normal. The right kidney measures 10.6 cm, and the left kidney, 10.7 cm longitudinally." This is the kind of ultrasound I was referring to. My urologist has a chart in her office showing the size of prostates in terms of cubic centimeters. Maybe some on this forum, who refer to their prostate in terms of grams could enlighten us. :-) Tom >> Thanks Pete ~ Ultrasounds can measure the size (cubic centimeters) of >> a prostate. [quoted text clipped - 60 lines] >>> questions about conversion factors, just post back and I'll try to >>> help. Pete > I'm not talking about a bladder scan ultrasound. I had a Renal > Ultrasound that measured my "prostate volume to be 61.6 cc. The [quoted text clipped - 4 lines] > kidney, 10.7 cm longitudinally." This is the kind of ultrasound I was > referring to. That's fine Tom. An ultrasound is just a high frequency sound wave device. An abdominal ultrasound checks five organs plus blood vessels (I've had several in my life along with a whole shitload of catscans and MRI's). I was just saying that they use a simple ultrasound to do your PVR. There is also a trans rectal ultra sound (TRUS) which I have never had. Was your renal ultrasound just for your kidneys or did they do the other organs also. > My urologist has a chart in her office showing the size of prostates > in terms of cubic centimeters. > Maybe some on this forum, who refer to their prostate in terms of > grams could enlighten us. :-) I think Lee's response hits it right on the head, so I guessed right about the one to one ratio. Take care, and you forgot to tell me how you are doing...Pete Tom >>> Thanks Pete ~ Ultrasounds can measure the size (cubic centimeters) >>> of a prostate. [quoted text clipped - 60 lines] >>>> questions about conversion factors, just post back and I'll try to >>>> help. Pete Hi Pete, I posted below that my incontinence is 50% improved and getting better, but I'm now taking Detrol to see if that helps. Thanks for asking. Tom >> I'm not talking about a bladder scan ultrasound. I had a Renal >> Ultrasound that measured my "prostate volume to be 61.6 cc. The [quoted text clipped - 88 lines] >>>>> questions about conversion factors, just post back and I'll try to >>>>> help. Pete An experienced Uro can judge the weight when he does a DRE. Derek. > Thanks Pete ~ Ultrasounds can measure the size (cubic centimeters) of a > prostate. How can the weight (grams) of a prostate be measured without [quoted text clipped - 45 lines] >> >> Pete Since tissue is mostly water and since 1cc of water weighs 1 gram, I think the conversion is assumed to be about 1 to 1. Urologists estimate weight from the DRE but it's just a guess based on experience. I had one uro tell me mine was 50g, another 30-35g, and the ultrasound said 21 cc. > Sorry if this is a repeat, but my prostate is 60 cc ~ what does that > convert to in grms. I did a search and couldn't anything. It seems to me > to ccs are referring to size and grms are referring to weight. Is this a > conversion of the weight of ccs of water? Thanks for any clarification. > Tom > Since tissue is mostly water and since 1cc of water weighs 1 gram, I > think the conversion is assumed to be about 1 to 1. Urologists > estimate weight from the DRE but it's just a guess based on > experience. I had one uro tell me mine was 50g, another 30-35g, and > the ultrasound said 21 cc. I wonder how accurate the ultrasound is. Hmmmm! >> Sorry if this is a repeat, but my prostate is 60 cc ~ what does that >> convert to in grms. I did a search and couldn't anything. It seems >> to me to ccs are referring to size and grms are referring to weight. >> Is this a conversion of the weight of ccs of water? Thanks for any >> clarification. Tom > I wonder how accurate the ultrasound is. Hmmmm! For what it's worth, DREs by two separate urologists underestimated the size of my prostate, and so did a bladder ultrasound (done from the front). That (and a flexible cystoscopy a couple of years earlier which had, oddly, reported 'not much enlargement')eventually led to a biopsy, because the feeling was that I seemed to be producing rather more PSA than I should with an apparently uninfected prostate of that size. Interestingly, the higher estimate produced by the TRUS (in the 40cc range) was in line with the impression of two urologists who did rigid cystoscopies soon after, shortly before my RF treatment (Targis) - one then wanted to do a TURP, and the other instead did the Targis procedure. In my case, at least, the transrectal ultrasound seemed to give a fairly accurate estimate; bladder ultrasound and DREs by two experienced urologists didn't. Maybe the shape of the prostate - i.e. the direction(s) it enlarges in - are a relevant factor. Actually, I don't think there is a direct relationship in any case between prostate size and degree of obstruction; it was the pretty obvious obstruction shown at cystoscopy which made it clear something needed to be done in my case, not the relatively moderate increase in the size estimate. Prostate size can be a factor at the time of operation, though; a large prostate means a longer operating time and some increased potential for later problems such as strictures. By the way, it's my impression too that the ratio of volume in ccs to weight in grams is taken as 1:1. I agree that working in ccs seems more rational, given that the measurement which can be estimated via DREs and ultrasound is of volume and not weight. Richard > I wonder how accurate the ultrasound is. Hmmmm! For what it's worth, DREs by two separate urologists underestimated the size of my prostate, and so did a bladder ultrasound (done from the front). That (and a flexible cystoscopy a couple of years earlier which had, oddly, reported 'not much enlargement')eventually led to a biopsy, because the feeling was that I seemed to be producing rather more PSA than I should with an apparently uninfected prostate of that size. Interestingly, the higher estimate produced by the TRUS (in the 40cc range) was in line with the impression of two urologists who did rigid cystoscopies soon after, shortly before my RF treatment (Targis) - one then wanted to do a TURP, and the other instead did the Targis procedure. In my case, at least, the transrectal ultrasound seemed to give a fairly accurate estimate; bladder ultrasound and DREs by two experienced urologists didn't. Maybe the shape of the prostate - i.e. the direction(s) it enlarges in - are a relevant factor. Actually, I don't think there is a direct relationship in any case between prostate size and degree of obstruction; it was the pretty obvious obstruction shown at cystoscopy which made it clear something needed to be done in my case, not the relatively moderate increase in the size estimate. Prostate size can be a factor at the time of operation, though; a large prostate means a longer operating time and some increased potential for later problems such as strictures. By the way, it's my impression too that the ratio of volume in ccs to weight in grams is taken as 1:1. I agree that working in ccs seems more rational, given that the measurement which can be estimated via DREs and ultrasound is of volume and not weight. Richard There are several formulas to translate cc in grams introducing an estimation of prostate density, but in most urologists minds cc and grams are roughly equivalent. Prostate size can be estimated by digital rectal examination, abdominal ultrasound and transrectal ultrasound. The last option is the best. Abdominal ultrasound is not very reliable, neither is DRE. Also, the determination of volume in ultrasound is based in formulas that assume that the prostate is an ellipsoid, but this is not necessarily true. e.g. a median lobe renders these formulas inaccurate. It is very usual to estimate the size of the prostate by DRE and abdominal ultrasound and then find in theatre that the prostate is much bigger or smaller than previously thought. If you have three ultrasounds made by different doctors with different bladder fill you will get different prostate sizes. All the best, Fernando http://drgomezsancha2.blogspot.com |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.