Dehydration

Check and manage Dehydration

Dehydration can show up in blood and urine tests before symptoms feel obvious. Common clues include BUN, creatinine, sodium, chloride, potassium, albumin, hematocrit, and urine specific gravity.

A high result can mean your blood or urine is more concentrated than expected. Your clinician can compare results with your symptoms, medicines, and recent fluid losses.

Monitoring matters because dehydration can change salts, kidney markers, and blood concentration. Rechecking levels may show whether fluids, diet changes, or medical care are helping.

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What is Dehydration?

Dehydration means your body has lost more fluid than it has taken in. That can make blood thicker and urine more concentrated.

You may feel thirsty, tired, dizzy, or foggy. Severe dehydration can affect blood pressure, kidneys, and electrolyte balance.

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Symptoms

Thirst or dry mouth
Dark yellow urine or peeing less often
Dizziness, lightheadedness, or headache
Fatigue, weakness, or confusion
Fast heartbeat or low blood pressure
Dry skin, sunken eyes, or few tears
Muscle cramps, especially after sweating

Causes and risk factors

Not drinking enough fluids
Heavy sweating from heat, exercise, or fever
Diarrhea or vomiting
Some water pills and other medicines
High blood sugar that causes frequent urination
Older age, because thirst signals may be weaker
Infants and young children, because fluid loss can happen faster

How it's diagnosed

Dehydration can show up in blood and urine tests before symptoms feel obvious. Common clues include BUN, creatinine, sodium, chloride, potassium, albumin, hematocrit, and urine specific gravity.

A high result can mean your blood or urine is more concentrated than expected. Your clinician can compare results with your symptoms, medicines, and recent fluid losses.

Treatment options

Management depends on severity and the cause. Many mild cases improve with fluids and electrolytes, which are body salts like sodium and potassium.

Get urgent care for confusion, fainting, chest pain, severe weakness, or no urination. Ask a clinician before large fluid changes if you have kidney, heart, or liver disease.

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We help you check dehydration related levels and plan your next step.

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Frequently asked questions

Safe ranges depend on the test, your age, and your health history. Labs often show a reference range beside each result. A clinician should review results that are high, low, or changing fast.

Yes, BUN can rise when your blood becomes more concentrated. BUN means blood urea nitrogen, a waste product from protein breakdown. Kidney function, protein intake, and bleeding can also affect BUN.

Chloride is an electrolyte, which is a body salt. It can look higher when water loss concentrates the blood. Vomiting, diarrhea, medicines, and kidney issues can also change chloride.

Albumin is a protein made by the liver. It may look high when there is less fluid in the blood. Your clinician may compare albumin with total protein and other results.

Urine specific gravity shows how concentrated your urine is. A higher value can happen when your body is saving water. Results should be read with symptoms and recent fluid intake.

Seek urgent help for confusion, fainting, chest pain, severe weakness, or no urination. Babies, older adults, and pregnant people may need care sooner. Severe vomiting or diarrhea can also become risky fast.

Sip fluids if you can keep them down. Oral rehydration drinks can replace water and electrolytes. Ask a clinician first if you have fluid limits or serious kidney, heart, or liver disease.