What is a normal urine specific gravity?

The normal range for adults is 1.005–1.030. A well-hydrated adult typically falls between 1.010 and 1.020. First morning urine is often more concentrated and may reach 1.030. Values outside this range may or may not be significant depending on clinical context.

What does high urine specific gravity mean?

A high result (above 1.030) means your urine is more concentrated than normal. The most common cause is dehydration. Other causes include vomiting, diarrhoea, fever, heart failure, SIADH, and elevated glucose or protein in the urine.

What does urine specific gravity 1.004 mean?

A result of 1.004 is just below the typical lower limit of 1.005 and indicates very dilute urine. Many labs consider 1.004 and 1.005 functionally similar — if isolated with no symptoms, it is usually benign and most likely reflects high fluid intake at the time of collection. If persistent, discuss with your doctor.

What does urine specific gravity 1.005 mean?

A result of 1.005 is at the lower end of the normal range and indicates dilute but technically normal urine. A common finding in well-hydrated individuals and usually not clinically significant.

What does urine specific gravity 1.010 mean?

A result of 1.010 falls within the normal range and is typical for a well-hydrated adult. However, if urine is consistently in the 1.008–1.012 range across multiple tests regardless of hydration, this may indicate impaired kidney concentrating ability and should be evaluated further.

What does urine specific gravity 1.015 mean?

A result of 1.015 is within the normal range and represents moderate urine concentration. Normal finding.

What does urine specific gravity 1.020 mean?

A result of 1.020 is within the normal range and represents moderately concentrated urine typical for an adult with average fluid intake. Normal finding.

What does urine specific gravity 1.025 mean?

A result of 1.025 is within the normal range and represents concentrated but normal urine. Commonly seen in first morning samples or after limited fluid intake.

What does urine specific gravity 1.030 mean?

A result of 1.030 is at the upper end of the normal range and indicates concentrated urine. In most cases this reflects mild dehydration and resolves with increased fluid intake. If persistent or accompanied by other abnormal urinalysis findings, have your healthcare provider review this result.

What does urine specific gravity 1.035 mean?

A result of 1.035 is above the standard upper limit and indicates highly concentrated urine consistent with significant dehydration, glycosuria, proteinuria, or contrast dye. If you were deliberately limiting fluids, your provider will interpret this in that context. Persistent results above 1.035 warrant clinical assessment.

What does a fixed specific gravity of 1.010 mean?

A urine specific gravity consistently fixed around 1.008–1.012 across multiple tests — regardless of hydration — is called isosthenuria. It indicates the kidneys have lost their ability to concentrate or dilute urine and is a pattern associated with advanced kidney dysfunction. Warrants evaluation with creatinine, eGFR, and urine osmolality.

Is low urine specific gravity dangerous?

Usually not. The most common cause is drinking a large amount of fluid before the test. It is only worth investigating when persistent and accompanied by excessive thirst, very high urine volumes, or other abnormal results. If your urine stays very dilute despite normal fluid intake and you feel excessively thirsty, ask your doctor to check for causes such as diabetes insipidus.

Does low urine specific gravity mean dehydration?

No — low specific gravity is the opposite of dehydration. Dehydration causes high specific gravity as the kidneys conserve water. Low specific gravity indicates dilute urine, most commonly from high fluid intake or diuretic use.

Can urine specific gravity be 1.000?

In practice, a true reading of 1.000 is not compatible with normal human urine. A dipstick result of 1.000 almost always reflects a testing artefact, sample contamination, or equipment issue and should be reported to your doctor or the lab for confirmation.

What is the difference between urine specific gravity and urine osmolality?

Both measure urine concentration but differ in precision. Specific gravity measures the density of all dissolved particles and is the standard routine test — fast and inexpensive. Urine osmolality counts only the number of particles per kilogram of water and is more precise, not affected by large molecules like glucose or contrast dye. Osmolality is preferred when evaluating diabetes insipidus or when a more accurate assessment of kidney concentrating ability is needed.

Urine Specific Gravity High or Low: What Your Result Means

Urine

Other names: Urine SG, Spec Grav UA, Spec Grav, UA, SP Gravity, UA Specific Gravity, U-Specific Gravity, POCT Spec Grav UA, SP Grav POC, Specific Gravity UR, SG Urine, Urinary Specific Gravity

Optimal Result: 1 - 1.03 SG.

Urinalysis

From Healthmatters.io Team and reviewed by HM Editorial Team

Last updated Updated on April 16, 2026

Lab Results Explained and Tracked

Urine Specific Gravity at a glance

Urine specific gravity (SG) shows how concentrated your urine is — and is one of the fastest ways to assess your hydration and kidney function.

Normal range: 1.005–1.030. High values usually mean dehydration. Low values may suggest overhydration or conditions like diabetes insipidus.

Most adults fall between 1.010 and 1.020 when well hydrated.

What is urine specific gravity?

Urine specific gravity measures the density of your urine relative to pure water (1.000). The higher the reading, the more dissolved substances your urine contains.

The kidneys continuously adjust urine concentration based on your body's needs. When you are dehydrated, they conserve water and produce concentrated urine. When you are well hydrated, they excrete more water and urine becomes more dilute. This flexibility is the hallmark of healthy kidney function.

Urine specific gravity is routinely measured as part of a standard urinalysis — either by dipstick or refractometer — and is one of the most accessible indicators of both hydration status and kidney concentrating ability.

On most lab reports it appears as: SG, Spec Grav, Spec Grav UA, SP Grav, or U-Specific Gravity. All refer to the same measurement.

Urine specific gravity normal range

Typical ranges (your lab's reference interval may differ slightly):

Population	Typical urine specific gravity
Adults (general)	1.005 – 1.030
Well-hydrated adult	1.010 – 1.020
First morning urine	Up to 1.030
Newborns	1.001 – 1.020

Note: Always compare your result to the range printed on your own report.

A result just outside the normal range is common and often reflects temporary hydration changes rather than disease.

What does a high urine specific gravity mean?

High urine specific gravity means your urine is concentrated — most often due to dehydration.

A result above 1.030 indicates your kidneys are conserving water and excreting a higher proportion of dissolved substances.

Common causes:

Dehydration — the most common cause by far
Vomiting, diarrhoea, or excessive sweating — fluid loss from any source
Fever — increased fluid loss through sweating and respiration
Heart failure — reduced kidney perfusion prompts water conservation
SIADH — excess antidiuretic hormone causes the kidneys to retain water
Glycosuria — glucose in the urine (as in uncontrolled diabetes mellitus) adds solutes and significantly raises specific gravity
Proteinuria — excess protein increases solute load
Radiographic contrast dye — excreted by the kidneys, temporarily elevating specific gravity
Renal artery stenosis or reduced kidney blood flow
Hepatorenal syndrome
Shock

Symptoms of the underlying cause may include thirst, fatigue, dark urine, reduced urine output, or swelling depending on the condition.

What does a low urine specific gravity mean?

Low urine specific gravity means your urine is very dilute — most often from drinking a large amount of fluid.

A result below 1.005 means the kidneys are excreting more water than usual, or have lost the ability to concentrate urine adequately.

Common causes:

Excessive fluid intake — the most common and benign cause
Diuretic medications — drugs that increase urine output
Diabetes insipidus — central (pituitary fails to produce ADH) or nephrogenic (kidneys fail to respond to ADH); produces very large volumes of extremely dilute urine, often 1.001–1.003, accompanied by excessive thirst and frequent urination
Psychogenic polydipsia — compulsive water drinking
Chronic kidney disease — impaired tubular function reduces concentrating ability
Pyelonephritis — kidney infection affecting tubular function
Acute tubular necrosis
Adrenal insufficiency
Hypothermia

What do specific urine specific gravity values mean?

Value	Interpretation	What to do
Below 1.003	Extremely dilute	If persistent without obvious cause, have your healthcare provider review
1.005–1.010	Dilute; good hydration or recent fluid intake	Usually not concerning in isolation
1.010–1.020	Normal range; typical for well-hydrated adult	No action needed
1.020–1.030	Moderately concentrated; normal for average intake or morning urine	No action needed
Above 1.030	Concentrated; often dehydration	Increase fluid intake and recheck; if persistent, speak to your doctor
Above 1.035	Highly concentrated	Clinical assessment warranted; evaluate for dehydration, glycosuria, or proteinuria
Fixed ~1.008–1.012	Isosthenuria — see below	Assess kidney function: creatinine, eGFR, urine osmolality

What does urine specific gravity 1.000 mean?

A result of exactly 1.000 is almost always a testing or collection artefact rather than a true physiological result — human urine always contains at least trace dissolved substances and cannot equal pure water in practice. Let your doctor or the lab know so they can confirm or repeat the test.

Common reasons this may appear: sample contamination with water, an incorrectly read or defective dipstick, or in very rare cases, severely dilute urine in extreme diabetes insipidus approaching but typically not reaching 1.000.

The fixed specific gravity: isosthenuria

One clinically important pattern is a urine specific gravity that remains consistently fixed around 1.008–1.012 — often reported as 1.010 — regardless of hydration status. This is called isosthenuria.

A value in this range reflects the specific gravity of the glomerular filtrate before the kidneys have concentrated or diluted it. Healthy kidneys can vary urine from as low as 1.001 to as high as 1.035+ depending on the body's needs. When urine is always in this narrow range regardless of whether a person is dehydrated or well hydrated, it indicates the kidneys have lost that concentrating flexibility — a pattern associated with advanced kidney dysfunction.

Isosthenuria is a finding, not a diagnosis. It warrants further evaluation with creatinine, eGFR, and urine osmolality. If multiple samples show a fixed specific gravity alongside elevated creatinine or reduced eGFR, your doctor will investigate for chronic kidney disease or other causes of tubular dysfunction.

What to do next based on your result

Result	Suggested next step
Slightly high (1.030–1.035), no symptoms	Increase fluid intake and recheck at next urinalysis
Persistently high (>1.030)	Review alongside urine glucose, urine protein, and kidney markers
Very low (<1.005), isolated	Usually hydration-related; monitor
Very low (<1.005), persistent with excessive thirst and high urine volume	Evaluate for diabetes insipidus; check urine osmolality and ADH response
Fixed around 1.008–1.012 across multiple samples	Assess kidney function: creatinine, eGFR, urine osmolality
Any result with abnormal protein, glucose, or blood in urinalysis	Full clinical review recommended

Urine specific gravity vs urine osmolality

Both measurements assess urine concentration, but they differ in precision and clinical use.

Urine specific gravity measures the density of all dissolved particles relative to water. It is fast, inexpensive, and performed as part of routine urinalysis. It is the standard first-line measure of urine concentration.

Urine osmolality measures only the number of dissolved particles per kilogram of water, independent of their size or weight. It is more precise and not affected by large molecules such as glucose, protein, or contrast dye — which can falsely elevate specific gravity. Urine osmolality is preferred when diabetes insipidus is being evaluated or when a more accurate measure of kidney concentrating ability is needed.

In most routine situations, specific gravity is sufficient. When results are borderline or the clinical question requires precision — particularly when distinguishing hydration changes from true kidney dysfunction — urine osmolality, creatinine, and eGFR together provide a more complete picture.

What is spec grav UA / spec grav, UA on a lab report?

These abbreviations all refer to urine specific gravity as part of a urinalysis panel. The "UA" stands for urinalysis. The abbreviation varies between laboratory reporting systems and electronic health record platforms but the measurement and normal range are the same.

Common label variants:

Spec Grav UA / Spec Grav, UA
SP Gravity / SP Grav
UA Specific Gravity / UA Spec Grav
U-Specific Gravity
POCT Spec Grav, UA (POCT = point of care testing)
SP Grav, POC / POC Spec Grav
Specific Gravity, UR / Spec Grav, UR
SG, Urine / SG UA

All use the same normal range of 1.005–1.030.

How urine specific gravity is measured

Dipstick (reagent strip) — a chemically treated strip is dipped into the urine sample. A colour change on the pad corresponds to the specific gravity. Fast and convenient, used in routine urinalysis, but slightly less precise than refractometry and can be affected by urine pH and some medications.

Refractometer — measures how light bends as it passes through the urine sample. More accurate, particularly at extremes of the range, and preferred for confirming abnormal dipstick results.

No fasting or special preparation is required. Collection time matters — first morning urine is typically most concentrated, while urine collected shortly after drinking large amounts of fluid will be dilute.

When to speak to your doctor

Most one-off results slightly outside the normal range are related to hydration and are not emergencies.

Speak to your doctor if:

Your specific gravity is consistently low (below 1.005) alongside excessive thirst, frequent urination, or very high urine volumes
Your specific gravity is consistently high alongside symptoms of dehydration, swelling, or reduced urine output
Your specific gravity is fixed around 1.008–1.012 across multiple samples regardless of hydration
Your result is accompanied by abnormal urinalysis findings — protein, glucose, blood, or casts
You have known kidney disease, diabetes, or heart failure and your result is outside your usual range

FAQ about Urine Specific Gravity

What is urine specific gravity?

Urine specific gravity is a urinalysis measurement of how concentrated your urine is compared to pure water. It reflects hydration status and how well the kidneys are concentrating or diluting urine. The normal adult range is 1.005–1.030.
What is a normal urine specific gravity?

The normal range for adults is 1.005–1.030. A well-hydrated adult typically falls between 1.010 and 1.020. First morning urine is often more concentrated and may reach 1.030. Values outside this range may or may not be significant depending on clinical context.
What does low urine specific gravity mean?

A low result (below 1.005) means your urine is very dilute. The most common cause is drinking a large amount of fluid before the test. Other causes include diuretic medications, diabetes insipidus, psychogenic polydipsia, and chronic kidney disease affecting concentrating ability.
What does high urine specific gravity mean?

A high result (above 1.030) means your urine is more concentrated than normal. The most common cause is dehydration. Other causes include vomiting, diarrhoea, fever, heart failure, SIADH, and elevated glucose or protein in the urine.
What does urine specific gravity 1.000 mean?

A result of exactly 1.000 is almost always a testing or collection artefact. Human urine always contains dissolved substances and cannot equal pure water. Let your doctor or the lab know so they can confirm or repeat the test.
What does urine specific gravity 1.004 mean?

A result of 1.004 is just below the typical lower limit of 1.005 and indicates very dilute urine. Many labs consider 1.004 and 1.005 functionally similar — if isolated with no symptoms, it is usually benign and most likely reflects high fluid intake at the time of collection. If persistent, discuss with your doctor.
What does urine specific gravity 1.005 mean?

A result of 1.005 is at the lower end of the normal range and indicates dilute but technically normal urine. A common finding in well-hydrated individuals and usually not clinically significant.
What does urine specific gravity 1.010 mean?

A result of 1.010 falls within the normal range and is typical for a well-hydrated adult. However, if urine is consistently in the 1.008–1.012 range across multiple tests regardless of hydration, this may indicate impaired kidney concentrating ability and should be evaluated further.
What does urine specific gravity 1.015 mean?

A result of 1.015 is within the normal range and represents moderate urine concentration. Normal finding.
What does urine specific gravity 1.020 mean?

A result of 1.020 is within the normal range and represents moderately concentrated urine typical for an adult with average fluid intake. Normal finding.
What does urine specific gravity 1.025 mean?

A result of 1.025 is within the normal range and represents concentrated but normal urine. Commonly seen in first morning samples or after limited fluid intake.
What does urine specific gravity 1.030 mean?

A result of 1.030 is at the upper end of the normal range and indicates concentrated urine. In most cases this reflects mild dehydration and resolves with increased fluid intake. If persistent or accompanied by other abnormal urinalysis findings, have your healthcare provider review this result.
What does urine specific gravity 1.035 mean?

A result of 1.035 is above the standard upper limit and indicates highly concentrated urine consistent with significant dehydration, glycosuria, proteinuria, or contrast dye. If you were deliberately limiting fluids, your provider will interpret this in that context. Persistent results above 1.035 warrant clinical assessment.
What does a fixed specific gravity of 1.010 mean?

A urine specific gravity consistently fixed around 1.008–1.012 across multiple tests — regardless of hydration — is called isosthenuria. It indicates the kidneys have lost their ability to concentrate or dilute urine and is a pattern associated with advanced kidney dysfunction. Warrants evaluation with creatinine, eGFR, and urine osmolality.
What does spec grav UA mean on a lab report?

Spec grav UA, spec grav, UA, SP grav, and similar abbreviations all refer to urine specific gravity as part of a urinalysis panel. UA stands for urinalysis. All variants use the same normal range of 1.005–1.030.
Is low urine specific gravity dangerous?

Usually not. The most common cause is drinking a large amount of fluid before the test. It is only worth investigating when persistent and accompanied by excessive thirst, very high urine volumes, or other abnormal results. If your urine stays very dilute despite normal fluid intake and you feel excessively thirsty, ask your doctor to check for causes such as diabetes insipidus.
Does low urine specific gravity mean dehydration?

No — low specific gravity is the opposite of dehydration. Dehydration causes high specific gravity as the kidneys conserve water. Low specific gravity indicates dilute urine, most commonly from high fluid intake or diuretic use.
Can urine specific gravity be 1.000?

In practice, a true reading of 1.000 is not compatible with normal human urine. A dipstick result of 1.000 almost always reflects a testing artefact, sample contamination, or equipment issue and should be reported to your doctor or the lab for confirmation.
What is the difference between urine specific gravity and urine osmolality?

Both measure urine concentration but differ in precision. Specific gravity measures the density of all dissolved particles and is the standard routine test — fast and inexpensive. Urine osmolality counts only the number of particles per kilogram of water and is more precise, not affected by large molecules like glucose or contrast dye. Osmolality is preferred when evaluating diabetes insipidus or when a more accurate assessment of kidney concentrating ability is needed.

Lab Results Explained and Tracked

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What does it mean if your Urine Specific Gravity result is too high?

High urine specific gravity means your urine is concentrated — most often due to dehydration.

Other causes include fluid loss from vomiting, diarrhoea, or sweating; heart failure; SIADH; and elevated glucose or protein in the urine. Radiographic contrast dye can also temporarily raise specific gravity.

If your result is above 1.030, increase fluid intake and recheck. If results stay elevated, you feel unwell, or your urinalysis shows other abnormalities, ask your doctor for a review. Symptoms of the underlying cause may include thirst, fatigue, dark urine, or reduced urine output.

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What does it mean if your Urine Specific Gravity result is too low?

Low urine specific gravity means your urine is very dilute — most often from drinking a large amount of fluid before the test.

Other causes include diuretic medications, diabetes insipidus, psychogenic polydipsia, and — when persistent — chronic kidney disease affecting the kidneys' concentrating ability. Diabetes insipidus in particular produces persistently dilute urine alongside excessive thirst and very high urine volumes.

A single low result with no symptoms is usually not a concern. If your urine stays very dilute despite normal fluid intake and you feel excessively thirsty or urinate frequently, ask your doctor to check for underlying causes.

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Urine Specific Gravity High or Low: What Your Result Means

Urine Specific Gravity at a glance

What is urine specific gravity?

Urine specific gravity normal range

What does a high urine specific gravity mean?

What does a low urine specific gravity mean?

What do specific urine specific gravity values mean?

What does urine specific gravity 1.000 mean?

The fixed specific gravity: isosthenuria

What to do next based on your result

Urine specific gravity vs urine osmolality

What is spec grav UA / spec grav, UA on a lab report?

How urine specific gravity is measured

When to speak to your doctor

FAQ about Urine Specific Gravity

What is urine specific gravity?

What is a normal urine specific gravity?

What does low urine specific gravity mean?

What does high urine specific gravity mean?

What does urine specific gravity 1.000 mean?

What does urine specific gravity 1.004 mean?

What does urine specific gravity 1.005 mean?

What does urine specific gravity 1.010 mean?

What does urine specific gravity 1.015 mean?

What does urine specific gravity 1.020 mean?

What does urine specific gravity 1.025 mean?

What does urine specific gravity 1.030 mean?

What does urine specific gravity 1.035 mean?

What does a fixed specific gravity of 1.010 mean?

What does spec grav UA mean on a lab report?

Is low urine specific gravity dangerous?

Does low urine specific gravity mean dehydration?

Can urine specific gravity be 1.000?

What is the difference between urine specific gravity and urine osmolality?

All Your Lab Results. One Simple Dashboard.

What does it mean if your Urine Specific Gravity result is too high?

Related Health Conditions

All Your Lab Results. One Simple Dashboard.

Import, Track, and Share Your Lab Results Easily

Import, Track, and Share Your Lab Results

What does it mean if your Urine Specific Gravity result is too low?

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