Comprehensive Metabolic Panel (CMP) Results Explained

BUN/Creatinine Ratio Chart: Look Up What Your Number Means (High & Low)

Sample type: Serum, Plasma

Other names: BUN/Creatinine Ratio, BUN:Creatinine Ratio, BUN/Creat Ratio, BUN:Creat Ratio, BUN/Cr Ratio, BUN:Cr Ratio, BUN/Cr, BUN:Cr, BUN/Creat, BUN:Creat, Blood Urea Nitrogen/Creatinine Ratio, Blood Urea Nitrogen to Creatinine Ratio, Urea Nitrogen/Creatinine Ratio, Urea/Creatinine Ratio, Serum BUN/Creatinine Ratio, BUN to Creatinine Ratio, B/C Ratio, B/C Ratio Blood Test, B/CR, BC Ratio, BC Ratio Blood Test, BN/CR, BN/CR Blood Test, BN/CR Calc, Calc BUN/Creat, Calc BUN/Creat Ratio, F BUN/Creatinine Ratio, BUN/Creat Serpl, BUN/Creat Serpl-MRTO, BUN/Creatinine Ratio See Note, BUN and Creatinine Not Reported, BUN Normal and Creatinine Normal, Pediatric BUN/Creatinine Ratio, BUN/Creatinine Ratio by Age, BUN Creatinine Low, BUN Creatinine High, BUN/Creatinine Ratio 30, BUN/Creatinine Ratio 25, BUN/Creatinine Ratio 7, BUN/Creatinine Ratio 8, BUN/Creatinine Ratio 15, Relación BUN Creatinina (Spanish), BUN Creatinine Ratio Alto (Spanish), B/C Ratio Blood Test High, B/C Ratio Blood Test Low

Optimal result: 10 – 24 :1 ratio

Labcorp

Written March 21, 2026

Updated August 1, 2026

By Healthmatters Editorial Team

Peer-reviewed sources

A high BUN/Creatinine ratio (above 20–24) most commonly reflects dehydration or reduced kidney blood flow — conditions where BUN rises faster than creatinine because the kidneys reabsorb more urea when blood flow slows. Other causes include upper gastrointestinal bleeding (which generates large amounts of urea from digested blood), high protein intake, catabolic states, and congestive heart failure. A ratio at or above 30 in a patient with GI symptoms — particularly black tarry stools or vomiting blood — strongly suggests upper GI bleeding and requires urgent evaluation. A ratio above 20 with normal creatinine is almost always dehydration. A ratio above 20 with rising creatinine suggests the kidneys may be progressing from underperfusion toward structural damage, or that both causes are present simultaneously.

A low BUN/Creatinine ratio (below 10) means creatinine is elevated relative to BUN, or BUN is lower than expected. The most common causes are liver disease (which impairs urea synthesis from protein), very low protein dietary intake (less nitrogen to generate BUN), overhydration, high muscle mass (which raises creatinine), and pregnancy (which increases kidney clearance). Low ratios are generally less urgent than high ratios but are not without clinical significance — liver disease in particular can reduce BUN to very low levels while creatinine remains relatively normal, producing a strikingly low ratio. Isolated low ratio in a well-nourished, otherwise healthy person often reflects diet or body composition rather than disease.

The BUN/Creatinine ratio (also called the B/C ratio) compares two waste products filtered by the kidneys: Blood Urea Nitrogen (BUN) from protein metabolism and creatinine from muscle metabolism. The normal adult range is 10–20, with some labs extending to 24. A high ratio (above 20–24) most commonly reflects dehydration or reduced kidney blood flow. A ratio of 30 or above in the right clinical context raises concern for upper gastrointestinal bleeding. A low ratio (below 10) may indicate liver disease, malnutrition, or low protein intake. The ratio is always interpreted alongside individual BUN and creatinine values, eGFR, hydration status, and clinical symptoms.

QUICK ANSWER

The BUN/Creatinine ratio compares two kidney waste products to help identify whether an abnormality reflects dehydration, kidney damage, or another cause.

Also called the B/C ratio — the same test, just the common lab abbreviation.

Normal range: 10–20 (most adults); some labs use 10–24

Ratio	Interpretation	What it typically means
Below 7	Low	Liver disease, overhydration, very low protein diet, or high muscle mass
7–9	Mildly low	Borderline low — evaluate in context
10–20	Normal	Healthy kidney function and hydration
21–24	Mildly elevated	Often mild dehydration
25–29	Moderately elevated	Reduced kidney perfusion or significant dehydration
30 or above	Significantly elevated	Consider GI bleeding if clinical context supports; also severe dehydration or prerenal causes
35+	Very high	Serious prerenal cause or upper GI bleeding strongly suggested

The most common cause of a high ratio is dehydration. The most clinically important cause of a ratio ≥30 is upper gastrointestinal bleeding — this is why a ratio above 30 always requires evaluation in the clinical context.

The most common cause of a mildly elevated BUN/Creatinine ratio (21–28) is dehydration. If your ratio is mildly elevated and your BUN and creatinine are both within normal ranges, drinking adequate fluids and repeating the test is almost always the first appropriate step.

WHAT DOES MY SPECIFIC BUN/CREATININE RATIO NUMBER MEAN?

The BUN/creatinine ratio is a ratio of two blood values and has no units. Normal is generally about 10–20 (some labs 10–24). All values below assume standard US units (BUN in mg/dL, creatinine in mg/dL). Interpretation is a guide — the ratio is read alongside the actual BUN, creatinine, and your clinical picture.

Low ratio (under 10) — BUN and creatinine out of their usual balance

My ratio is...	What it usually means
6	Low — low protein intake, liver disease, overhydration, or intrinsic kidney injury
7	Low — as above; recheck protein intake, liver, and hydration
8	Low — a common low value; often low protein, liver disease, or overhydration
9	Low-normal boundary — usually benign; correlate with BUN and creatinine
10	Bottom of the normal range

Normal ratio (about 10–20)

My ratio is...	What it usually means
11	Normal
12	Normal
13	Normal
14	Normal
15	Normal (mid-range)
16	Normal
17	Normal
18	Normal
19	Normal
20	Top of the usual normal range (some labs extend to ~24)

High ratio (over 20) — most often dehydration or a prerenal cause

My ratio is...	What it usually means
21	Borderline-high — often mild dehydration; may still be within some labs' range
22	High-borderline — dehydration or reduced kidney blood flow (prerenal)
23	Mildly high — prerenal (dehydration, low blood flow) most likely
24	Mildly high — dehydration/prerenal; upper limit at some labs
25	High — dehydration, prerenal state, or an upper-GI bleed
26	High — as above; correlate with hydration and symptoms
27	High — prerenal or GI bleed; check BUN and creatinine individually
28	High — dehydration/prerenal; consider GI bleeding if BUN is high
29	High — prerenal cause likely
30	Clearly high — dehydration, prerenal azotemia, or GI bleeding are the usual causes
31	Clearly high — as at 30; the higher the ratio, the stronger the prerenal/GI-bleed signal
32	Markedly high — significant dehydration/prerenal or GI bleed; correlate clinically
33	Markedly high — as above
34	Markedly high — evaluate hydration, kidney blood flow, and possible GI bleeding
35	Markedly high — strong prerenal/GI-bleed signal
36	Markedly high — as above; interpret with the full picture

Above 36: ratios of 37–40 and higher carry the same interpretation as the 30s — a strong signal for significant dehydration, a prerenal state, or GI bleeding — and warrant prompt correlation with the BUN, creatinine, and clinical picture.

Decimal results: a decimal ratio falls in the same band as its nearest whole number — for example, a 24.3 is read like 24, and a 22.9 like 23.

WHAT DOES "B/C RATIO" MEAN ON A BLOOD TEST?

"B/C ratio" is the abbreviation for BUN/Creatinine ratio — the same test, reported under a shorter name. It is also the second-most searched query on this page, which is why it deserves a direct answer.

B/C ratio = BUN ÷ Creatinine — Blood Urea Nitrogen divided by creatinine.

Other abbreviations for the same calculated value:

Lab label	What it means
B/C Ratio	BUN/Creatinine Ratio — most common short form
B/CR	BUN/Creatinine Ratio
BC Ratio	BUN/Creatinine Ratio
BN/CR	BUN/Creatinine Ratio
Calc BUN/Creat	Calculated BUN/Creatinine — indicates it is derived, not directly measured
BUN/Creat Serpl	BUN/Creatinine Serum (laboratory-specific format)
F BUN/Creatinine Ratio	BUN/Creatinine Ratio (some LabCorp report formats)

The normal B/C ratio is 10–20 (same as BUN/Creatinine). A value above 20–24 most commonly indicates dehydration. All interpretation throughout this page applies equally to the B/C ratio.

WHAT IS THE BUN/CREATININE RATIO?

The BUN/Creatinine ratio is a calculated value derived by dividing BUN (Blood Urea Nitrogen) by creatinine — two waste products filtered by the kidneys that are measured in almost every standard chemistry panel.

Why the ratio matters:

BUN and creatinine are processed differently by the kidneys:

BUN is filtered by the kidney but also partially reabsorbed — the amount reabsorbed increases when urine flow slows (as in dehydration or reduced blood flow)
Creatinine is filtered but minimally reabsorbed — it changes much less with hydration status

This difference means that when dehydration or reduced kidney perfusion occurs, BUN rises disproportionately relative to creatinine, pushing the ratio up. This is exactly the clinical distinction the ratio is designed to reveal.

What the B/C ratio abbreviation means:

On many lab reports this test appears as "B/C Ratio," "B/CR," "BC Ratio," "BN/CR," or "Calc BUN/Creat" — all refer to the same calculated ratio. The test is not a separate blood draw; it is calculated from the BUN and creatinine values already measured in your panel.

WHAT IS A DANGEROUSLY HIGH BUN/CREATININE RATIO?

There is no single "dangerous" threshold without clinical context, but:

Pattern	Clinical significance
Above 20 with normal creatinine	Usually dehydration — drink fluids, repeat test
Above 24 with rising creatinine	Evaluate for kidney damage — not just dehydration
At or above 30 in any patient	Evaluate clinical context; if GI symptoms present, GI bleeding must be excluded
Above 35 with symptoms	Urgent medical evaluation — severe prerenal cause or GI bleeding
Rising ratio on serial tests	More significant than a single elevated result
Ratio above 30 + low hemoglobin	Strong suspicion for GI bleeding — urgent evaluation

When to seek medical attention promptly:

Ratio above 30 with black/tarry stools, vomiting blood, or unexplained weakness
Ratio above 24 with very low urine output, swelling, or confusion
Ratio rising significantly on repeat testing within days or weeks

Confirming dehydration as the cause — cross-marker patterns:

When the ratio is mildly elevated (21–28), these additional findings help confirm dehydration as the explanation:

Additional finding	Interpretation
Dark/concentrated urine	Supports dehydration — kidneys conserving water
High urine specific gravity (>1.020)	Strongly supports dehydration
Elevated hemoglobin and hematocrit	Hemoconcentration — blood concentrated from fluid deficit
BUN and creatinine both normal	Consistent with mild dehydration (ratio elevated without individual values crossing thresholds)
Ratio normalizes after adequate hydration	Confirms dehydration was the cause
Ratio persists after rehydration	Raises concern for non-dehydration cause — evaluate further

WHAT DOES A LOW BUN/CREATININE RATIO MEAN?

A low ratio (below 10) means creatinine is elevated relative to BUN, or BUN is lower than expected. Low ratios are less discussed than high ratios but account for a meaningful portion of patient searches.

Common causes of low BUN/Creatinine ratio:

Cause	Mechanism	Notes
Liver disease	Impaired urea synthesis — less BUN produced	BUN low; creatinine relatively normal
Malnutrition / very low protein diet	Less protein to generate urea	BUN falls; creatinine less affected
Overhydration	Dilutes BUN more than creatinine	Common in patients receiving IV fluids
High muscle mass	Elevated creatinine from large muscle volume	Bodybuilders may have persistently low ratios
Pregnancy	Increased GFR clears creatinine efficiently; plasma volume expansion dilutes BUN	Common in healthy pregnancy
Dialysis	BUN cleared efficiently; ratio less reliable
SIADH	Water retention dilutes BUN
Intrinsic kidney disease	Creatinine rises proportionally to BUN	Ratio may be low-normal in established CKD
Rhabdomyolysis	Massive creatinine release from muscle	Creatinine disproportionately elevated

Is a low BUN/Creatinine ratio dangerous?

Less commonly urgent than a high ratio, but not always benign. A low ratio in the setting of liver disease, malnutrition, or muscle breakdown can be clinically significant. Isolated low ratio in a well-nourished, otherwise healthy person often reflects diet or muscle mass. Clinical context determines significance.

WHAT DO BUN AND CREATININE MEAN INDIVIDUALLY?

The ratio is only meaningful in the context of the individual values. Here are the typical adult reference ranges:

Marker	Normal range (adults)	Key clinical interpretation
BUN (Blood Urea Nitrogen)	7–25 mg/dL (most labs)	Elevated with dehydration, high protein, kidney disease, GI bleeding; Low with liver disease, low protein
Creatinine	0.6–1.2 mg/dL (males); 0.5–1.1 mg/dL (females)	Elevated with kidney disease or muscle breakdown; Low with low muscle mass or liver disease

The ratio adds context the individual values cannot provide:

BUN	Creatinine	Ratio	Most likely interpretation
High	Normal	High (>20)	Dehydration or prerenal cause — kidneys working, but underperfused
High	High	Normal (10–20)	Intrinsic kidney disease — both markers elevated proportionally
High	High	High (>20)	Severe prerenal cause or GI bleeding on top of baseline kidney disease
Normal	Normal	High (>20)	Most common confusing pattern — usually mild dehydration or high protein intake; BUN can remain within normal limits while rising enough to push the ratio above 20
Low	Normal	Low (<10)	Liver disease or low protein diet
Normal	High	Low (<10)	High muscle mass or rhabdomyolysis

WHAT DOES "SEE NOTE" OR "NOT REPORTED" MEAN ON BUN/CREATININE RATIO?

Several users explicitly search for "bun/creatinine ratio see note meaning" and "not reported: bun and creatinine are within reference range." These are specific lab report notations that cause confusion.

"BUN/Creatinine Ratio — See Note"

This typically means the laboratory system flagged the result for additional comment. The most common reasons:

The ratio is outside the expected range (above 30 or below 8)
One of the source values (BUN or creatinine) is flagged individually
The lab system applies an automatic notation for values in certain clinical ranges

What to do: Read the note itself (usually printed below or in a comments section). If no note is visible, the notation is often a system-generated flag for clinician review — not necessarily an emergency.

"Not Reported: BUN and Creatinine Are Within Reference Range"

This is the opposite — a reassuring notation. It means:

Both BUN and creatinine individually are within normal limits
The laboratory has determined the ratio does not add clinical value when both source values are normal
No ratio is calculated or reported in this case

This notation is routine and does not indicate a problem. When BUN and creatinine are both normal, the ratio is almost always in the normal range by definition.

BUN/CREATININE RATIO BY AGE — PEDIATRIC RANGES

The normal BUN/Creatinine ratio varies by age. Children have different baseline values than adults, and this is one of the most searched yet least-addressed aspects of this test.

Age group	Typical BUN/Creatinine ratio range	Notes
Infants (0–12 months)	10–30 (wide variation)	Creatinine is very low in infants; ratio can appear high by adult standards
Young children (1–5 years)	10–25	Creatinine lower than adults; ratio slightly higher
Older children (6–12 years)	10–22	Approaching adult ranges
Adolescents (13–17 years)	10–20	Adult reference range generally applies
Adults	10–20 (up to 24 in some labs)	Standard reference range

Why pediatric ratios differ:

Children have lower serum creatinine than adults because they have less muscle mass. This lower creatinine denominator means the BUN/Creatinine ratio can be higher in children even when kidney function is completely normal. A ratio of 25–30 in a well-hydrated child with no symptoms may be normal — this is a common source of concern for parents who compare their child's ratio to adult reference ranges.

Pediatric "dangerously high" threshold:

In children, ratios above 30 should be interpreted in context — dehydration is very common and often the explanation. However, values consistently above 30–35 in a child with symptoms (vomiting, diarrhea, decreased urine output) warrant clinical evaluation. Upper GI bleeding is rarer in children than adults but still a consideration with very high ratios.

AKI (ACUTE KIDNEY INJURY) CLASSIFICATION

The BUN/Creatinine ratio is a key tool for classifying the type of acute kidney injury when creatinine is elevated:

AKI Type	Mechanism	Typical ratio	What it means
Prerenal	Reduced blood flow to kidneys	>20 (often >30)	Kidneys are structurally intact but underperfused — dehydration, heart failure, blood loss
Intrinsic renal	Direct kidney damage	10–20 (normal)	The ratio does not rise because both BUN and creatinine are elevated proportionally
Postrenal	Urinary obstruction	Variable (often normal)	Obstruction causes both BUN and creatinine to back up together

In practical terms:

Elevated creatinine + high ratio → the kidneys are probably working but underperfused → treat the cause (give fluids, treat heart failure, etc.)
Elevated creatinine + normal ratio → the kidneys themselves may be damaged → further evaluation with urinalysis, imaging, and nephrology consult

WHY TRENDS MATTER MORE THAN ONE RESULT

Pattern	Clinical meaning
Stable ratio of 22 over years	Often individual baseline — low concern
Ratio rising: 18 → 22 → 28 over weeks	Progressive dehydration or worsening kidney perfusion
Ratio normalizing after IV fluids or rehydration	Confirms prerenal/dehydration cause
Ratio persistently above 30 despite hydration	Evaluate for non-dehydration cause — GI bleeding, liver disease, high protein catabolism
Rising ratio + rising creatinine together	More serious — possibly transitioning from prerenal to intrinsic kidney damage

A single elevated ratio in the context of acute illness and recovery is much less significant than a ratio that is persistently high or rising across multiple tests over weeks or months.

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Frequently Asked Questions

Can fasting increase the BUN/Creatinine ratio?

Yes. Both fasting and mild dehydration — which often accompany each other, particularly when fasting before a blood draw — can raise the BUN/Creatinine ratio. During fasting, protein catabolism (the breakdown of body protein for energy) increases BUN production. Simultaneously, reduced fluid intake during a fast can cause mild dehydration, which increases BUN reabsorption by the kidneys. Both effects raise BUN relative to creatinine, pushing the ratio up. This is one reason mildly elevated ratios are frequently seen on fasting CMP panels in otherwise healthy people — the ratio often normalizes when the test is repeated after normal eating and hydration. High-protein diets and intense exercise have similar effects on BUN through increased protein turnover.

My BUN and creatinine are both normal but my BUN/Creatinine ratio is high. Should I worry?

This is one of the most common patient concerns about this test — and in most cases, the answer is no. When BUN and creatinine are both individually within normal limits, a high ratio almost always reflects mild dehydration or high protein intake rather than kidney disease. The ratio can appear elevated even when neither source value is flagged, because the ratio reflects their relative proportions — a BUN of 22 mg/dL and a creatinine of 0.8 mg/dL gives a ratio of 27.5, which is above the normal range even though both values are technically normal. If you are mildly dehydrated, both BUN and creatinine can remain within normal limits while the ratio rises. In this scenario, adequate hydration and a repeat test is almost always the appropriate first step.

What is the BUN/Creatinine ratio?

The BUN/Creatinine ratio (also called B/C ratio) is a calculated value comparing two kidney waste products: Blood Urea Nitrogen (BUN) from protein metabolism and creatinine from muscle metabolism. Because these markers are processed differently by the kidneys, the ratio provides clinical information that neither value alone can supply — most importantly, it helps distinguish dehydration (where BUN rises disproportionately) from kidney damage (where both rise together).

What does a high BUN/Creatinine ratio mean?

A high BUN/Creatinine ratio (above 20–24) most commonly means dehydration or reduced kidney blood flow. In these conditions, BUN rises faster than creatinine because the kidneys reabsorb more urea when blood flow slows. A ratio at or above 30 also raises clinical concern for upper gastrointestinal bleeding, because digested blood in the GI tract generates large amounts of urea that elevate BUN rapidly.

What does a low BUN/Creatinine ratio mean?

A low ratio (below 10) usually means creatinine is elevated relative to BUN, or BUN is lower than expected. The most common causes are liver disease (which impairs urea production), very low protein intake (less nitrogen to generate urea), overhydration, high muscle mass (which elevates creatinine), and pregnancy. Low ratios are generally less urgent than high ratios but should still be interpreted in clinical context.

What does "B/C ratio" mean on a blood test?

B/C ratio is the abbreviation for BUN/Creatinine ratio — the same test. It may also appear as B/CR, BC Ratio, BN/CR, BN/CR Calc, Calc BUN/Creat, or BUN/Creat Serpl on different laboratory reports. All refer to the calculated ratio of Blood Urea Nitrogen divided by creatinine.

What does "BUN/Creatinine Ratio — See Note" mean?

"See Note" on a BUN/Creatinine ratio means the laboratory system flagged the result for a clinical comment — typically because the ratio is outside a specific threshold, or one of the source values (BUN or creatinine) is individually flagged. Read the note that accompanies the flag. If no explanatory note is visible, the flag may be a routine system notation for clinician review — not necessarily an emergency.

What does "Not Reported: BUN and Creatinine Are Within Reference Range" mean?

This is a reassuring notation, not a concerning one. It means both BUN and creatinine are individually within normal limits, and the laboratory has determined that calculating the ratio adds no additional clinical value when the source values are normal. No ratio is reported in this setting because it is not diagnostically needed.

What is a dangerously high BUN/Creatinine ratio?

There is no universal "dangerous" threshold — clinical significance depends on symptoms, other lab values, and trends. However, a ratio at or above 30 warrants evaluation, particularly if accompanied by GI symptoms (black stools, vomiting blood), very low urine output, severe weakness, or confusion. Ratios above 35 in a symptomatic patient generally warrant prompt medical attention. A high ratio with normal creatinine is usually less urgent than a high ratio with rising creatinine.

Is a BUN/Creatinine ratio of 30 dangerous?

A ratio of 30 is significantly elevated and always warrants clinical evaluation. In the right context — particularly with GI symptoms such as black tarry stools, vomiting blood, or unexplained anemia — a ratio of 30 raises strong clinical concern for upper gastrointestinal bleeding. Without GI symptoms, it more commonly reflects severe dehydration or markedly reduced kidney blood flow. A ratio of 30 with normal individual BUN and creatinine values is rare and may reflect a laboratory calculation issue.

What is the normal BUN/Creatinine ratio for children?

Children have lower serum creatinine than adults due to less muscle mass, which means their BUN/Creatinine ratio can be slightly higher by adult reference range standards while still being normal. In infants and young children, ratios of up to 25–30 may be within normal limits. The adult reference range (10–20) applies approximately from adolescence onward. A pediatric ratio should always be compared against age-appropriate reference ranges rather than adult standards.

Can dehydration alone cause a ratio of 30?

Yes. Severe dehydration can drive BUN high enough to push the ratio to 30 or above, particularly when accompanied by reduced urine output and concentrated urine. This is one reason that a ratio of 30 does not automatically indicate GI bleeding — clinical context (presence or absence of GI symptoms, urine color, fluid intake history) is essential to interpretation.

Clinical Sources & References

All our content is backed by peer-reviewed studies, academic research, and trusted medical sources. We’re committed to accuracy and transparency — see our editorial policy for details.

Acute Kidney Injury (AKI)

2026 National Kidney Foundation, Inc. · 2024 View source ↗
Acute renal failure in critically ill patients: a multinational, multicenter study

JAMA. · 2005 View source ↗
KDIGO Clinical Practice Guideline for Acute Kidney Injury

Kidney International Supplements · 2012 View source ↗
BUN-to-Creatinine Ratio Identifies a High-Risk but Potentially Reversible Form of Renal Dysfunction in Patients With Decompensated Heart Failure

Circ Heart Fail. · 2013 View source ↗
Diagnostic Value of the Blood Urea Nitrogen to Creatinine Ratio in Gastrointestinal Bleeding

Dig Dis. · 2024 View source ↗
Pediatric reference intervals for several biochemical analytes in school children in Central Taiwan

J Formos Med Assoc. · 2009 View source ↗
Does this patient have a severe upper gastrointestinal bleed?

JAMA. · 2012 View source ↗
Evaluation of the Patient With Renal Issues

Merck Manual Professional Edition. · 2025 View source ↗
Normotensive ischemic acute renal failure

N Engl J Med. · 2007 View source ↗

Article Review Log

Last reviewed August 1, 2026

Originally published March 21, 2026

Reviewed by HealthMatters Editorial Team

Written by Healthmatters Editorial Team

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BUN/Creatinine Ratio Chart: Look Up What Your Number Means (High & Low)

QUICK ANSWER

WHAT DOES MY SPECIFIC BUN/CREATININE RATIO NUMBER MEAN?

Low ratio (under 10) — BUN and creatinine out of their usual balance

Normal ratio (about 10–20)

High ratio (over 20) — most often dehydration or a prerenal cause

WHAT DOES "B/C RATIO" MEAN ON A BLOOD TEST?

WHAT IS THE BUN/CREATININE RATIO?

WHAT IS A DANGEROUSLY HIGH BUN/CREATININE RATIO?

WHAT DOES A LOW BUN/CREATININE RATIO MEAN?

WHAT DO BUN AND CREATININE MEAN INDIVIDUALLY?

WHAT DOES "SEE NOTE" OR "NOT REPORTED" MEAN ON BUN/CREATININE RATIO?

BUN/CREATININE RATIO BY AGE — PEDIATRIC RANGES

AKI (ACUTE KIDNEY INJURY) CLASSIFICATION

WHY TRENDS MATTER MORE THAN ONE RESULT

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