Kidney Disease or Dehydration

Check and manage Kidney Disease or Dehydration

A BUN and creatinine ratio uses a blood test to compare 2 kidney waste markers. BUN means blood urea nitrogen. Creatinine comes from normal muscle use.

A high ratio can happen when your body is low on fluids. It can also point to kidney stress. Your clinician may compare the ratio with creatinine, eGFR, symptoms, and medications.

Monitoring matters because one result does not tell the whole story. Fluid loss, diet, recent illness, and some medicines can affect results. Repeat testing may show whether the ratio returns to range or needs medical follow up.

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What is Kidney Disease or Dehydration?

A high BUN and creatinine ratio can feel confusing. It often raises 2 big questions. Are you dehydrated, or are your kidneys under stress.

Your kidneys filter waste from your blood. BUN and creatinine are 2 wastes that help show how filtering is working.

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Symptoms

Thirst or dry mouth.
Dark urine or urinating less often.
Fatigue or weakness.
Dizziness when standing.
Swelling in the feet, ankles, or around the eyes.
Nausea or poor appetite.
Muscle cramps.
High blood pressure.

Causes and risk factors

Not drinking enough fluids.
Vomiting, diarrhea, sweating, or fever.
Kidney disease or reduced kidney blood flow.
Heart failure or liver disease.
High protein intake before testing.
Bleeding in the digestive tract.
Some medicines, including diuretics and certain pain relievers.
Older age, diabetes, and high blood pressure.

How it's diagnosed

A BUN and creatinine ratio uses a blood test to compare 2 kidney waste markers. BUN means blood urea nitrogen. Creatinine comes from normal muscle use.

A high ratio can happen when your body is low on fluids. It can also point to kidney stress. Your clinician may compare the ratio with creatinine, eGFR, symptoms, and medications.

Treatment options

Management depends on the cause. Dehydration may need careful fluid replacement. Kidney disease may need blood pressure care, diabetes care, medicine review, and follow up testing.

Ask a clinician before changing medicines or fluid intake. This matters more if you have heart, kidney, or liver disease.

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Check your inbox and confirm your email. We will send next steps for Kidney Disease or Dehydration testing and monitoring.

Get testing next steps for Kidney Disease or Dehydration

We help you check and manage your BUN and creatinine ratio.

First Name *

Last Name *

Email *

Phone Number *

ZIP Code *

I agree to receive text messages and emails from Rite Aid.

Frequently asked questions

It compares 2 waste markers in your blood. BUN comes from protein breakdown. Creatinine comes from normal muscle use. Your kidneys help remove both.

A high ratio can happen with dehydration. It can also happen when the kidneys are under stress. Your clinician reads it with other kidney tests and your symptoms.

A blood test can measure BUN and creatinine. The ratio is calculated from those 2 results. Your clinician may also check eGFR and urine protein.

Reference ranges can vary by lab. Many labs flag results outside their expected range. Your result should be reviewed with your age, health history, and symptoms.

Yes, dehydration can raise BUN more than creatinine. This can increase the ratio. Illness, sweating, vomiting, or diarrhea can make dehydration more likely.

Seek urgent care for confusion, fainting, chest pain, severe weakness, or trouble breathing. Also get help for no urination, severe dehydration, or blood in stool.

Yes, some medicines can affect kidney markers or fluid balance. Examples include diuretics and certain pain relievers. Ask a clinician before stopping any medicine.

Timing depends on the cause and your risk factors. A clinician may repeat testing after fluids, illness recovery, or medicine changes. Ongoing kidney disease often needs regular monitoring.