Lab result explainedUrinalysisLast updated November 10, 2026

Urine pH: what the normal range is and what acidic or alkaline urine means

Urine pH (pH) · Urinalysis · reported in pH units (no unit symbol), reported to 0.5 on a dipstick or 0.1 on a pH meter

Urine pH is a measure of how acidic or alkaline your urine is on a scale from 0 (most acidic) to 14 (most alkaline), with 7.0 neutral. The kidneys can produce urine anywhere from about 4.5 to 8.0, and on a random sample most people fall between 5.5 and 6.5, with an average close to 6.0, so normal urine is mildly acidic. The number mainly reflects what you ate in the previous day (meat and cheese push it down, fruit and vegetables push it up), how long the sample sat before testing, and whether bacteria are present.

People search for urine pH for two main reasons. One is kidney stones: uric acid stones form only in acidic urine (below 5.5), calcium phosphate and infection (struvite) stones form in alkaline urine (above about 6.5 to 7.0), and stone prevention often means steering the pH into a target band. The other is a urinalysis flagged as acidic or alkaline, which on its own almost never means disease. The exceptions worth knowing are a strongly alkaline urine (7.5 to 8.0 or above) with a urinary tract infection, which points to urea-splitting bacteria such as Proteus, and an alkaline urine in someone whose blood is acidic, which is the signature of distal renal tubular acidosis.

Urine pH is not a readout of your body's acid-base balance and it cannot tell you whether your blood is acidic; blood pH is held tightly between 7.35 and 7.45 and is measured with a blood gas. Nor does an acidic urine mean you are "too acidic" or need an alkaline diet. It means your kidneys are doing their job of excreting the acid produced by a normal diet.

pH at a glance

What it is: the acidity of urine on a dipstick or pH meter; a readout of how much acid or base the kidneys are excreting at that moment.
Normal: 4.5–8.0 is the full physiologic range; a typical random or first-morning sample is 5.5–6.5 (average about 6.0). Labs differ slightly in the printed range.
Acidic urine (below 5.5): high-protein or meat-heavy diet, fasting, diarrhea, metabolic acidosis, diabetes and metabolic syndrome, gout; favors uric acid stones.
Alkaline urine (above 7.0): vegetarian diet, a meal just before the test, vomiting, urea-splitting urinary infection, distal renal tubular acidosis, alkalinizing medicines, or a sample that sat too long.
Stone targets: 6.0–6.5 for uric acid stone prevention, above 7.0 for cystine stones, and below about 6.5 if you form calcium phosphate stones.
Next step: repeat on a fresh first-morning sample tested within an hour; if alkaline with symptoms, a urine culture; if persistently abnormal with stones or low blood bicarbonate, a 24-hour urine and blood chemistry.

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What pH measures

A normal Western diet generates about 50 to 100 mmol of acid a day, mostly from the sulfur-containing amino acids in meat, fish, eggs and cheese. The kidneys excrete this acid two ways: by combining it with phosphate (titratable acid) and by producing ammonia in the tubules, which binds hydrogen ions and leaves as ammonium. The final urine pH is the balance of acid excreted against bicarbonate reabsorbed. Fruit and vegetables contain potassium salts of organic acids that are metabolized to bicarbonate, so they make urine more alkaline; protein does the opposite.

The dipstick pH pad holds two indicator dyes, methyl red and bromothymol blue, which together shift from orange through green to blue across pH 5 to 9, read in 0.5-unit steps. It is accurate enough for routine screening but not for stone management, where labs and urologists use a glass-electrode pH meter accurate to 0.1 unit. A few things interfere: if the strip is dipped and not blotted, acid buffer from the neighboring protein pad can run onto the pH pad and read falsely low, and a very alkaline urine (8 or more) can make the protein pad read falsely positive.

Timing matters more for pH than for almost any other urinalysis result. Urine left at room temperature loses carbon dioxide and, if bacteria are present, they split urea into ammonia, so the pH drifts upward within an hour or two; a stale sample reading 8.0 may have been 6.0 when passed. Urine is most acidic first thing in the morning and becomes transiently alkaline for an hour or two after meals (the "alkaline tide" as the stomach secretes acid). For stone work, the useful measurement is a fresh sample, or several readings across the day.

Normal range for pH

Reference ranges vary between labs and by age, sex and pregnancy. Use the range printed on your own report.

Group	Typical range (pH units (no unit symbol), reported to 0.5 on a dipstick or 0.1 on a pH meter)	Notes
Full physiologic range	4.5–8.0	Healthy kidneys cannot produce urine more acidic than about 4.5 or more alkaline than about 8.0. Labs print this or a narrower range such as 5.0–8.0.
Typical random or first-morning sample	5.5–6.5 (average about 6.0)	Mildly acidic is normal on a mixed diet. First-morning urine is usually the most acidic of the day.
Acidic urine	Below 5.5	Common with a meat-heavy diet, fasting, diarrhea, diabetes or metabolic syndrome. The pH band in which uric acid stones form.
Alkaline urine	Above 7.0	Vegetarian diet, after meals, vomiting, alkalinizing medicines, urease-producing bacteria, or a sample that sat too long before testing.
Strongly alkaline	7.5–8.0 or more	With a urinary tract infection, suggests Proteus, Klebsiella or Staphylococcus saprophyticus; with low blood bicarbonate, suggests distal renal tubular acidosis.
Uric acid stone prevention target	6.0–6.5	American Urological Association guideline; uric acid is about ten times more soluble at 6.5 than at 5.0. Avoid going above 7.0, which favors calcium phosphate.
Cystine stone prevention target	Above 7.0	Cystine solubility roughly doubles between pH 7.0 and 7.5.
Calcium phosphate and struvite stones	Form above about 6.5–7.0; struvite usually above 7.2	If you form these stones, alkalinizing supplements and alkaline diets can make them worse.
Distal (type 1) renal tubular acidosis	Urine pH stays above 5.5 despite blood acidosis	Diagnosed with blood bicarbonate, potassium and an acid-load or furosemide test, not urine pH alone.

Alkaline urine (high urine pH)

An alkaline urine, above about 7.0, means your kidneys are excreting bicarbonate or little acid at that moment. In most people the explanation is ordinary: you ate recently (the post-meal alkaline tide), your diet is high in fruit, vegetables or dairy and low in meat, you take an antacid, potassium citrate or sodium bicarbonate, or the sample sat for a few hours before it was tested. A single alkaline result on a routine urinalysis in someone who feels well needs nothing more than a fresh first-morning repeat.

Alkaline urine becomes a clue when it comes with other findings. Combined with positive leukocyte esterase, cloudy urine or an ammonia-like smell, a pH of 7.5 to 8.5 suggests infection with a urease-producing organism (Proteus mirabilis is the classic one, also Klebsiella, Morganella, Providencia and Staphylococcus saprophyticus), which split urea into ammonia; these infections can grow large struvite stones that fill the kidney (staghorn calculi). Combined with a low blood bicarbonate and low potassium, an alkaline urine that never drops below 5.5 is the hallmark of distal renal tubular acidosis, in which the kidney cannot secrete acid and calcium phosphate stones and bone loss follow.

Alkaline urine also changes the chance of some stones. Calcium phosphate crystallizes above about pH 6.5 and struvite above 7.2, so people who form these stones are advised against alkalinizing diets and supplements. Conversely, an alkaline urine protects against uric acid and cystine stones. Alkaline urine does not make bacterial infections more likely by itself, but it is why cranberry and vitamin C, which acidify urine slightly, are sometimes suggested for people with recurrent infections; the evidence that acidifying urine prevents infection is weak.

Common causes

Diet high in fruit, vegetables and dairy, low in meat
Plant foods deliver potassium citrate and malate that the body converts to bicarbonate. Vegetarians commonly have urine pH of 6.5 to 7.5, about one unit higher than meat eaters.
Testing within an hour or two of a meal
As the stomach secretes acid after eating, the blood and then the urine become briefly alkaline (the alkaline tide), raising urine pH by about 0.5 to 1.0 unit.
Sample that sat before testing
Loss of carbon dioxide and bacterial growth raise the pH of standing urine; a sample tested more than two hours after collection, unrefrigerated, can drift from 6 to 8 and is unreliable.
Urinary tract infection with urea-splitting bacteria
Proteus, Klebsiella, Morganella, Providencia, Pseudomonas and Staphylococcus saprophyticus produce urease, which converts urea to ammonia. Urine pH of 7.5 to 9.0 with pyuria strongly suggests one of these; E. coli, the most common cause of UTI, does not raise pH.
Distal (type 1) renal tubular acidosis
A tubular defect stops hydrogen-ion secretion, so urine pH stays at or above 5.5 even when blood bicarbonate is low. Causes include Sjögren's syndrome, lupus, lithium, amphotericin B and inherited forms; calcium phosphate stones and nephrocalcinosis are common.
Vomiting and metabolic alkalosis
Loss of stomach acid raises blood bicarbonate and the kidney excretes the excess, giving alkaline urine early on; later, as volume depletion sets in, the urine paradoxically turns acidic.
Medications and supplements
Sodium bicarbonate, potassium citrate, acetazolamide, some antacids and large doses of calcium or magnesium carbonate all raise urine pH; so do the citrate salts used to prevent stones and the alkalinizing effect of topiramate.
Respiratory alkalosis from over-breathing
Prolonged hyperventilation from anxiety, pain, high altitude or fever lowers blood carbon dioxide and the kidney compensates by dumping bicarbonate into the urine.
Vegetable-rich fasting, prolonged standing of catheter urine, or contamination with soap
Less common causes that mainly matter for a single misleading result.

Symptoms that can go with it

None; alkaline urine itself causes no symptoms
Cloudy, foul or ammonia-smelling urine with burning or frequency if the cause is a urease-producing infection
Flank pain, fever and blood in the urine with struvite (infection) stones
Muscle weakness, fatigue and bone pain in renal tubular acidosis, from low potassium and calcium loss
Nausea, vomiting or heartburn if the cause is vomiting or heavy antacid use
Recurrent kidney stones, particularly calcium phosphate

Acidic urine (low urine pH)

An acidic urine, below about 5.5, means your kidneys are excreting a lot of acid or very little bicarbonate. The commonest reasons are a meat- and cheese-heavy diet, a first-morning sample (overnight the lungs retain a little carbon dioxide and the kidneys excrete acid), fasting or a low-carbohydrate diet that generates ketoacids, and diarrhea, which loses bicarbonate from the gut. A pH of 5.0 on a routine urinalysis in someone who feels well is normal and is not a sign that your body is "acidic".

Persistently acidic urine does have one clinical consequence: uric acid stones. Uric acid is poorly soluble below pH 5.5 and about ten times more soluble at 6.5, so people whose urine stays at 5.0 to 5.3 form uric acid stones even with a normal uric acid level. The best-documented group is people with type 2 diabetes, obesity and metabolic syndrome, in whom insulin resistance reduces the kidney's ability to make ammonia; their 24-hour urine pH averages about 5.5 compared with about 6.1 in people without metabolic syndrome, and uric acid stones are two to three times more common. Gout and chronic diarrhea (including from bowel resection or a stoma) produce the same picture.

Acidic urine also appears in true metabolic acidosis, when the kidney is correctly dumping acid: diabetic ketoacidosis, starvation ketosis, lactic acidosis, kidney failure, and aspirin or methanol poisoning. In those situations the diagnosis comes from blood tests (bicarbonate, anion gap, glucose, ketones), not from the urine pH, which simply confirms that the kidney is responding. Urine pH below 5.5 in someone with a low blood bicarbonate actually argues against distal renal tubular acidosis, which is useful.

Common causes

High-protein, meat-heavy or ketogenic diet
Sulfur amino acids and ketoacids increase the acid load; a diet with over 1.5 g of protein per kg of body weight commonly lowers urine pH to 5.0 to 5.5. Fasting and very-low-carbohydrate diets do the same through ketone production.
First-morning sample
Overnight urine is the most acidic of the day, often 5.0 to 5.5, because of mild carbon dioxide retention during sleep and no meals.
Diabetes, obesity and metabolic syndrome
Insulin resistance impairs ammonia production in the proximal tubule, so acid is excreted with less buffering and urine pH falls, typically to 5.3 to 5.6; this is the main reason uric acid stones are common in type 2 diabetes.
Gout and high uric acid excretion
People with gout often have a low urine pH and high uric acid excretion, a combination that leads to uric acid stones in 10 to 25 percent.
Diarrhea, ileostomy and bowel disease
Bicarbonate lost in loose stool is replaced by the kidney, which excretes extra acid; chronic diarrhea also concentrates the urine and lowers citrate, a double risk for uric acid stones.
Metabolic acidosis (ketoacidosis, lactic acidosis, kidney failure, poisoning)
The kidney maximally acidifies urine (down to 4.5) in response to acid in the blood; the urine pH is a bystander and the blood tests make the diagnosis.
Medications and supplements that acidify urine
Ammonium chloride, methenamine (which needs a pH below 5.5 to work), large doses of vitamin C, and acidic foods such as cranberry juice lower urine pH by a few tenths of a unit.
Respiratory acidosis
Chronic carbon dioxide retention in severe COPD or sleep apnea makes the kidney excrete more acid to compensate.
Dehydration and low potassium
Volume depletion and hypokalemia both increase acid secretion in the tubules; the classic example is the acidic urine late in prolonged vomiting.

Symptoms that can go with it

None; acidic urine itself causes no symptoms
Severe flank pain spreading to the groin, blood in the urine and nausea with a uric acid stone
Gout attacks: sudden severe pain, redness and swelling of a joint, often the big toe
Loose, frequent stools if the cause is chronic diarrhea or bowel disease
Thirst, frequent urination, fruity breath, vomiting or deep rapid breathing in ketoacidosis, an emergency
Thirst and weight loss with high blood sugar in undiagnosed diabetes

Read it alongside

Urine specific gravity — concentrated acidic urine is the highest-risk combination for uric acid stones; dilute urine lowers stone risk at any pH.
Nitrite and leukocyte esterase — a pH of 7.5 or higher with these positive suggests a urease-producing infection and a culture is needed.
Serum bicarbonate (CO2) and anion gap — an alkaline urine with a low bicarbonate points to renal tubular acidosis; an acidic urine with a low bicarbonate and high anion gap points to ketoacidosis or lactic acidosis.
Serum potassium — low with distal renal tubular acidosis; checked whenever the urine pH and blood bicarbonate do not fit.
Uric acid (blood and 24-hour urine) — high uric acid excretion plus urine pH under 5.5 defines uric acid stone risk.
24-hour urine citrate, calcium and oxalate — the stone-risk profile that decides whether raising the urine pH is helpful or harmful.
Urine crystals on microscopy — uric acid crystals form below 5.5, calcium phosphate and struvite (coffin-lid) crystals above 7.
Glucose and A1C — low urine pH is common in insulin resistance and type 2 diabetes.

What usually happens next

An isolated acidic or alkaline result with no symptoms and a normal rest-of-urinalysis usually needs only a repeat on a fresh first-morning sample tested within an hour of collection.
Alkaline urine with positive leukocyte esterase, nitrite or symptoms leads to a urine culture; a urease-producing organism prompts a kidney ultrasound or CT to look for struvite stones.
If you have had a kidney stone, expect stone analysis and a 24-hour urine collection measuring pH, volume, calcium, oxalate, citrate and uric acid; the pH target then depends on the stone type.
Alkaline urine with a low blood bicarbonate or low potassium is investigated for renal tubular acidosis with repeat chemistry, a urine anion gap and sometimes an acid-load test.
Persistently acidic urine with a high uric acid or metabolic syndrome is a reason to discuss weight, diet and, if stones have formed, potassium citrate with your clinician.
Ask: was the sample fresh, is there an infection, what kind of stone do I form, and does my blood bicarbonate match the urine pH?

Diet, lifestyle and natural levers with evidence

What can move pH once the cause is known. Nothing here replaces finding the cause.

Eat more fruit and vegetables and less meat (lower dietary acid load)

Moderate evidence

Diet is the strongest everyday influence on urine pH. Foods are ranked by their potential renal acid load (PRAL): meat, fish, cheese and eggs are acid-forming, while fruit and vegetables are base-forming, and shifting from a meat-heavy to a plant-rich pattern raises urine pH by roughly 0.5 to 1.0 unit. In a cohort of more than 240,000 adults, those following a DASH-style diet (high in fruit, vegetables, nuts, legumes and low-fat dairy) had about 40 to 45 percent fewer kidney stones than those with the least DASH-like diets.

If you form calcium phosphate or struvite stones, alkalinizing diets can make them worse; check your stone type first.

Cut back on animal protein and salt if you form stones

Moderate evidence

In a five-year randomized trial of 120 men with recurrent calcium stones, a normal-calcium diet low in animal protein (about 52 g a day) and salt (under 3 g sodium) halved stone recurrence compared with a low-calcium diet (20 versus 38 percent). Lower animal protein reduces acid load, uric acid excretion and calcium loss, and raises urine pH and citrate modestly.

Orange juice or other citrate-rich citrus

Moderate evidence

In a crossover trial in 13 people, about 400 mL of orange juice three times a day with meals raised urine pH from around 5.7 to about 6.5 and increased urinary citrate by roughly 60 percent, an effect comparable to potassium citrate; lemonade raised citrate less and did not change pH. Potassium citrate itself raises urine pH by about 0.5 to 1.0 unit and is the standard prescription for uric acid stones.

Fruit juice adds sugar and calories; people with diabetes or calcium phosphate stones should discuss it first. Grapefruit juice interacts with many medications.

Bicarbonate-rich mineral water

Preliminary evidence

Small trials in stone formers found that about 1.4 liters a day of mineral water high in bicarbonate (over 1,500 mg/L), calcium and magnesium raised urine pH by roughly 0.3 to 0.5 unit and increased citrate, while plain water did not change pH. Drinking enough fluid to pass more than 2 liters of urine a day lowers stone risk regardless of pH.

Weight loss and better insulin sensitivity

Preliminary evidence

Low urine pH in metabolic syndrome tracks insulin resistance, and the number of metabolic syndrome features predicts urine pH in a graded way (about 6.1 with none, falling to about 5.7 with four or more). Weight loss and improved glucose control improve ammonia production and urine pH in small studies, and reduce uric acid stone risk, though large trials measuring pH as an outcome are lacking.

Know what acidifies urine: cranberry and high-dose vitamin C

Preliminary evidence

Cranberry juice lowers urine pH by about 0.2 to 0.4 unit and raises oxalate excretion, and vitamin C above about 1,000 mg a day acidifies urine slightly and also raises oxalate, so both can increase calcium oxalate and uric acid stone risk. Neither has good evidence for preventing infection by acidifying urine; cranberry's modest benefit for recurrent UTIs comes from blocking bacterial adhesion, not pH.

Avoid high-dose vitamin C and large amounts of cranberry if you form calcium oxalate or uric acid stones.

When to see a clinician promptly

Severe one-sided flank or back pain that comes in waves, with nausea, blood in the urine or inability to pass urine: a possible stone, and an emergency if there is also fever.
Alkaline, cloudy or foul-smelling urine with fever, chills or flank pain, suggesting a kidney infection, which needs same-day treatment.
Acidic urine with thirst, vomiting, abdominal pain, deep rapid breathing or confusion in someone with diabetes: possible ketoacidosis, call emergency services.
An alkaline urine on repeated tests together with a low blood bicarbonate, low potassium, muscle weakness or repeated calcium phosphate stones (possible renal tubular acidosis).
Recurrent stones of any type, to get stone analysis and a 24-hour urine so the pH target can be set correctly.
A child with persistently alkaline urine and poor growth, vomiting or frequent stones.

Frequently asked questions

What is a normal urine pH?

Anywhere from 4.5 to 8.0 is within the kidney's normal range, and most random samples are between 5.5 and 6.5, averaging about 6.0, so slightly acidic urine is normal. First-morning urine is usually more acidic (about 5.0 to 5.5) and urine passed after a meal is more alkaline. Labs print slightly different ranges; a result is only flagged when it sits at the extremes and even then is usually diet-related.

Is a urine pH of 5.0 bad?

Usually not. A pH of 5.0 is common on a first-morning sample, after a high-protein meal, during fasting or a low-carbohydrate diet, or with diarrhea. It matters mainly if you form uric acid stones, have gout, or have diabetes or metabolic syndrome, where persistently acidic urine raises stone risk, and if you have symptoms of ketoacidosis. In those cases the urine pH is checked alongside blood tests and a 24-hour urine.

Is a urine pH of 7.0 or 8.0 bad?

A pH of 7.0 is neutral and normal after meals or on a plant-based diet. A pH of 8.0 is the upper limit of what healthy kidneys produce and is most often due to a sample that sat for hours, a vegetarian diet, antacids or citrate. It becomes important with signs of infection (it points to urea-splitting bacteria and struvite stones) or with a low blood bicarbonate (it points to renal tubular acidosis). Repeat on a fresh sample before drawing conclusions.

What causes alkaline urine?

A diet rich in fruit, vegetables and dairy; testing soon after a meal; a urine sample left standing; urinary infection with urease-producing bacteria such as Proteus; vomiting; alkalinizing medicines such as sodium bicarbonate, potassium citrate and acetazolamide; and, less commonly, distal renal tubular acidosis or hyperventilation. In someone who feels well the first three explain nearly all cases.

What causes acidic urine?

A meat-, fish- and cheese-heavy diet, fasting or ketogenic eating, a first-morning sample, diarrhea, diabetes and metabolic syndrome (which reduce the kidney's ammonia production), gout, dehydration, and medicines such as ammonium chloride, methenamine and high-dose vitamin C. True metabolic acidosis (ketoacidosis, lactic acidosis, kidney failure) also acidifies urine, but it is diagnosed from blood tests.

Does urine pH tell me if my body is acidic or alkaline?

No. Blood pH is held between 7.35 and 7.45 by the lungs and kidneys, and urine pH swings between 4.5 and 8.0 precisely because the kidneys are excreting whatever acid or base is needed to keep blood pH stable. Acidic urine on a meat-heavy diet means the kidneys are working normally, not that you are acidic. The idea that an alkaline diet changes blood pH is not supported; it does change urine pH, which can be useful for certain stones.

What urine pH prevents kidney stones?

It depends on the stone. Uric acid stones dissolve and stop forming when urine pH is kept at 6.0 to 6.5; cystine stones need a pH above 7.0; calcium phosphate and struvite stones form in alkaline urine, so those stone formers aim to stay below about 6.5 and avoid alkalinizing supplements. Calcium oxalate, the most common stone, is not very pH-dependent, and fluid intake, citrate, calcium and oxalate matter more.

Can a urinary tract infection change urine pH?

Yes. Bacteria that produce the enzyme urease, notably Proteus mirabilis, Klebsiella and Staphylococcus saprophyticus, split urea into ammonia and push the pH to 7.5 or higher, which is a clue to the organism and a warning about struvite stones. E. coli, which causes most infections, does not raise urine pH, so a normal or acidic pH does not rule out a UTI.

References

Urine pH test. MedlinePlus Medical Encyclopedia, US National Library of Medicine (2023)View source
Urinalysis. MedlinePlus, US National Library of Medicine (2023)View source
Simerville JA, Maxted WC, Pahira JJ. Urinalysis: a comprehensive review. American Family Physician (2005)
Urinalysis. Merck Manual Professional Version (2024)
Pearle MS, Goldfarb DS, Assimos DG, et al.. Medical management of kidney stones: AUA guideline. Journal of Urology (2014)
Remer T, Manz F. Potential renal acid load of foods and its influence on urine pH. Journal of the American Dietetic Association (1995)
Maalouf NM, Cameron MA, Moe OW, Adams-Huet B, Sakhaee K. Low urine pH: a novel feature of the metabolic syndrome. Clinical Journal of the American Society of Nephrology (2007)
Odvina CV. Comparative value of orange juice versus lemonade in reducing stone-forming risk. Clinical Journal of the American Society of Nephrology (2006)
Taylor EN, Fung TT, Curhan GC. DASH-style diet associates with reduced risk for kidney stones. Journal of the American Society of Nephrology (2009)
Borghi L, Schianchi T, Meschi T, et al.. Comparison of two diets for the prevention of recurrent stones in idiopathic hypercalciuria. New England Journal of Medicine (2002)
Rodríguez Soriano J. Renal tubular acidosis: the clinical entity. Journal of the American Society of Nephrology (2002)
Kessler T, Jansen B, Hesse A. Effect of blackcurrant-, cranberry- and plum juice consumption on risk factors associated with kidney stone formation. European Journal of Clinical Nutrition (2002)

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This page is educational and is not medical advice or a diagnosis. Lab results have to be interpreted together with your history, symptoms and other results by a clinician who knows you. Do not start or stop a supplement to change a lab value before the cause is known.