High blood urea (azotemia) and when to worry
High blood urea (azotemia): what it is, values, symptoms, diet and when to worry based on symptoms. Complete NefroCenter guide.
High blood urea (azotemia) is a key parameter for assessing the health of the kidneys and of the body. It increasingly appears in blood tests, but not everyone knows what it really means and, above all, when it is a reason to worry.
What is blood urea (azotemia)
It is the value that indicates the amount of urea present in the blood.
Urea is a waste product made by the liver during protein metabolism. Once produced:
- it passes into the blood
- it is filtered by the kidneys
- it is eliminated in the urine
When this mechanism does not work properly, urea builds up in the blood, which is called azotemia.
The difference from urea
People often confuse urea and blood urea (azotemia).
- Urea → waste product
- Blood urea (azotemia) → a measure of the concentration of urea in the blood
Another related parameter is BUN (blood urea nitrogen), that is, urea nitrogen.
Normal blood urea values
Normal values are:
| Parameter | Normal values |
|---|---|
| Blood urea (azotemia) | 22 – 46 mg/dL |
| BUN | 10.3 – 21.4 mg/dL |
Higher values may indicate a problem, but they must always be interpreted in the clinical context.
When to worry
A high value does not always mean a serious disease.
It is advisable to be concerned when:
- the values are very high
- they persist over time
- they are associated with other altered parameters (creatinine)
- symptoms are present
Symptoms of high blood urea
The problem can be asymptomatic in the early stages.
When symptoms appear:
- tiredness and exhaustion
- swollen legs
- dark or foamy urine
- itching
- nausea
- loss of appetite
- insomnia or drowsiness
- high blood pressure
These symptoms are often linked to an underlying kidney problem
Causes of high blood urea
The causes can be divided into 3 categories:
1. Pre-renal causes
- dehydration
- high-protein diet
- heart failure
In these cases the problem is NOT in the kidneys.
2. Renal causes
- kidney failure
- kidney diseases (nephropathies)
- damage to the glomeruli
These are the most important causes and the ones to monitor.
3. Post-renal causes
- urinary obstructions
- stones
- prostate problems
Blood urea and creatinine
The value should never be evaluated on its own.
It must always be considered together with:
- creatinine
- GFR
- urine test
If both are high → possible kidney failure.
Tests to have
For a complete evaluation:
- blood urea (azotemia)
- creatinine
- electrolytes
- urine test
- complete blood count
At NefroCenter centers, all the tests can be done with a high level of accuracy.
Recommended tests
| Test | Function |
|---|---|
| Blood urea (azotemia) | measures urea |
| Creatinine | kidney function |
| Urine test | filtration |
| Electrolytes | salt balance |
| Complete blood count | general condition |
High blood urea and diet
Diet plays a key role.
Goal: reduce the load on the kidneys.
What to eat with high blood urea
Recommended foods:
- leafy green vegetables
- artichokes
- cucumbers
- asparagus
- berries
- apples
- fish
Drink at least 1.5 – 2 liters of water a day (unless otherwise directed by your doctor).
Table of recommended foods
| Food | Benefit |
|---|---|
| Vegetables | cleansing |
| Fruit | antioxidants |
| Fish | omega-3 |
| Extra virgin olive oil | anti-inflammatory |
What to avoid
- excess red meat
- cured meats
- processed foods
- salt
- alcohol
High blood urea and kidney failure
The values are often linked to chronic kidney disease.
Stages of kidney disease
| Stage | Condition |
|---|---|
| 1 | initial damage |
| 2 | mild |
| 3 | moderate |
| 4 | severe |
| 5 | end-stage failure |
When dialysis is needed
Dialysis is needed in stage 5.
It is used to:
- filter the blood
- remove urea
- lower blood urea
The role of NefroCenter centers
The NefroCenter Group offers:
- early diagnosis
- advanced tests
- dialysis centers
- continuous monitoring
Learn more:
https://www.nefrocenter.it
When to see a specialist
It is essential to see a doctor when:
- persistently high blood urea
- obvious symptoms
- presence of chronic conditions
A sign, not a disease
It is not a disease, but a sign.
It may indicate:
- dehydration
- an incorrect diet
- a kidney problem
For this reason it is essential to:
- have regular checkups
- follow a proper diet
- see specialists
FAQ
What is it
It is an increase in urea in the blood.
When to worry
When it is persistent or associated with symptoms.
What to eat
Vegetables, fruit, fish and low-protein foods.
Does dialysis lower blood urea
Yes, in advanced cases.
