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Q: pee-H? ( Answered ,   2 Comments )
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 Subject: pee-H? Category: Science Asked by: jat-ga List Price: \$10.00 Posted: 05 Sep 2002 17:06 PDT Expires: 05 Oct 2002 17:06 PDT Question ID: 62107
 ```When checking urine with a pH strip, I find that I'm sometimes running as "acid" as 6.0-6.3 and sometimes as "alkaline" as 7.0-7.3. These are approximate ranges, but show the variation. And, I've noticed that there is a "diurnal variation" of sorts, with the measurement changing as I go through the day. What I'd like to know is the "why" of my "pee-H" and its (possible) connection with the condition of my interstitial fluids. For example, when I'm "alkaline", does that mean my kidneys are filtering what is essentially a fluid high in alkaline minerals? When the pH is in the more "acid" range of the lower 6's, does that mean there aren't as many alkaline minerals available and that my urine reflects this? What's going on here?```
 Subject: Re: pee-H? Answered By: jeremymiles-ga on 08 Sep 2002 14:25 PDT Rated:
 ```The first thing I think that you need to understand in order to answer this question is the nature of the pH scale. The pH scale is about the concentration of hydrogen ions, however it is not a linear scale. This page shows the scale: http://old.jccc.net/~pdecell/chemistry/phscale.html search strategy: pH scale ://www.google.com/search?q=pH+scale A one unit shift in pH is equal to 10 times more (or fewer) hydrogren ions. Water, pH 7, is neutral. Something pH 6 is acid, and has 10 times more hydrogen ions than water. Something ph 8 is alkaline, and has 10 times fewer hydrogen ions than water. A shift of 0.3 is approximately a factor of 2 - either halved, or doubled. The next thing to consider is blood pH. Enzymes work happily only within a certain pH range. This is part of the reason that our stomachs contain acid, and our intestines alkaline (which, when they meet, causes the creation of gas). The body needs to take action to maintain the correct pH of blood (7.4). According to this page (and the pages linked from it): http://www.usyd.edu.au/su/anaes/lectures/acidbase_mjb/acidbase.html There are three actions that can be takes: buffer control (i.e. chemical), respiratory control and renal control. The different controls are used for different reasons, but the kidneys are used to excrete excess acid or base, to solve the balance. The kidneys can produce urine with a pH as low as 4.4. So we know that the kidneys will change the pH of urine to maintain the pH of the blood a 7.4, so why does the pH of the blood change? The first, and less obvious answer, is breathing. When a person breathes quickly (hyperventilates) this has the effect of removing too much carbon dioxide (CO2) from the blood, changing its acidity – CO2 dissolved in water is carbonic acid. Remove the CO2, you raise the pH of the blood. (And this can cause dizziness, because the enzymes of the brain only work within a limited pH). http://www.emedicine.com/ped/topic70.htm The perhaps more obvious way that blood can change its pH is through the food that we eat. Eating tends to cause blood pH (and therefore urine pH) to rise. According to this page: http://www.dehlgroup.com/acidph2.html This is why many people’s urine is acid in the morning, and alkaline in the evening. However, different foods have different effects – some foods make the blood more acid, others make it more alkaline. This page shows a list: http://www.thewolfeclinic.com/acidalkfoods.html Fruits, counterintuitively, tend to make the blood alkaline because the citric acid is converted to hydrogencarbonate, which forms substances like sodium hydrogencarbonate (sodium bicarbonate, or baking soda), when it gets into the blood. Search strategy: blood pH food ://www.google.com/search?q=blood+pH+food A final point: this page http://www.dehlgroup.com/acidph2.html (referenced already above) says that urine pH below 6.0 or above 8.5 is considered unhealthy. So on these measures, you are OK. Please feel free to request clarification prior to rating this answer. Thanks for asking this interesting question, jeremymiles-ga```
 jat-ga rated this answer:

 ```This might help you out a bit: http://www.rnceus.com/ua/uaph.html```
 ```I think you are asking about ACID-BASE HOMEOSTASIS. As you know human body has some input (minerals, water, food, etc.) and some output (urine, faeces, perspiration). There are mechanisms, which are providing the internal ograngs and systems with uniform conditions of the environment. You understand that every one of your systems is being connected to all others, being in one body. You kidneys are connected with filtering your blood, taking in mind the minerals, pH, glucose, proteins, etc. Here is an example: If your blood for some reason turns more acid (which cannot be possible, because the pH of the blood must be about 7.4 if you are alive), the kydneys and the chemical compounds, known as buffers are trying to emergently compensate this, filtering out a part of the system. This is the method the organism uses to support the homeostasis of you blood. The process is in norma and not pathological.```