The blood UA test, 24-hour urine UA excretion test, and blood pH test, are normally ordered through doctor's office. The (arterial) blood pH test is rarely done unless a person is under certain medical emergency. You can test the urine pH yourself using a pH paper.
The blood UA level and the amount of UA excreted in urine a day, are very useful info in managing gout. Studies have shown that if we can maintain the blood UA level under 5~6 mg/dL, the crystals will dissolve thus can prevent future gout attacks. This usually requires medication and may take months or years for the crystals to disappear.
The pH and the amount of UA in urine can tell us if steps are needed to increase UA excretion and to prevent kidney stones and kidney failure. If the amount of UA excretion is too low, it is beneficial to increase the excretion rate using Sulfinpyrazone, Probenecid, Losartan, etc. However, if UA excretion is too high and the urine pH is too low, one needs to cut these medicines and alkalize the urine to prevent UA kidney stones and kidney failure.
"The pH of the body" is a general and vague expression. Medically, the pH of the arterial blood and anion gap (AG) obtained from blood electrolyte test , are used to diagnose acidosis and alkalosis, the serious medical conditions. For others, "the pH of the body" may mean the pH of the urine, or some other general and value conditions. While the pH of the urine is normally positively correlated with the pH of the blood, it is not always so. For patients whose kidneys are unable to excrete acids in the urine, they will have normal or high urine pH and lower than normal blood pH, i.e., acidosis, a serious condition. As for gout patients, it is important to keep the pH around the joint at normal level to avoid gout attacks. Heavy exercise, as well as lack of exercise, can both cause changes of the pH around the joints and trigger gout attacks.
More gout info can be found at ICuredMyGout.org . Take care.