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Published on: Jan 23, 2022
3 minute read
By: Second Medic Expert

Diagnostics: Kidney Function Test

Diagnostics: Kidney function Test

Blood and urine tests are done to check kidney function.

Blood tests that can help assess kidney function include creatinine level, blood urea nitrogen level, and estimated glomerular filtration rate (eGFR).

Urine tests that can help assess kidney function include urine protein test, urine specific gravity test, and urine creatinine test.

What tests are done to check kidney function?

The most common tests to check kidney function are a blood test called creatinine and a urine test called albumin.

Creatinine is a waste product that is released into the blood when the muscle is damaged. So if the kidneys are not working properly, creatinine levels will go up. Albumin is a protein that is found in the urine. If the kidneys are not working properly, more albumin will leak out of the kidneys and into the urine.

Other tests that may be done to check kidney function include:

-A blood test to measure creatinine clearance. This measures how well the kidneys are filtering creatinine from the blood.

-A urine test to measure protein levels. High protein levels

When a doctor checks kidney function, they will order a blood test to check creatinine levels and blood urea nitrogen levels. These tests give an indication of how well the kidneys are working. If the creatinine or BUN levels are high, it means that the kidneys are not working properly. The doctor may also order a urine test to look for albumin in the urine. Albumin is a protein that is normally filtered out by the kidneys. If there is albumin in the urine, it means that the kidneys are not working properly.

What is the most accurate test for kidney function?

The most accurate test for kidney function is a creatinine blood test. It measures the level of creatinine in your blood. Creatinine is a waste product that is released when muscle tissue is damaged. So the higher your creatinine level, the more damage your kidneys have sustained.

Other tests that can be used to measure kidney function include a BUN (blood urea nitrogen) test and urine analysis. However, both tests are less accurate than the creatinine blood test.

What is a normal kidney function level?

Normal kidney function is when the kidneys filter wastes and excess fluid from the blood to make urine. The normal range for creatinine, a waste product that is filtered out by the kidneys, is 0.5 to 1.1 mg/dL for women and 0.6 to 1.2 mg/dL for men. Urine output should be about 600 to 800 mL per day. If you have symptoms such as foamy urine, swelling in your legs, shortness of breath, or chest pain, see your doctor right away because they may be signs of a problem with your kidneys.

Normal kidney function is defined as a creatinine level below 1.5 mg/dL in men and below 1.4 mg/dL in women. Creatinine is a waste product that is eliminated from the body through the kidneys. When the kidneys are functioning properly, they filter creatinine and other waste products from the blood and excrete them in urine. A creatinine level that is higher than normal indicates that the kidneys are not filtering blood as efficiently as they should be. This can be a sign of many different diseases or conditions, including kidney disease, liver disease, heart failure, and diabetes.

What are the first signs of kidney disease?

The first signs of kidney disease are usually subtle and can be easily missed. Here are five common early signs of kidney disease:

1) Changes in urine output, such as a decrease in the amount of urine produced or an increase in the amount of time needed to produce a full bladder

2) Increased thirst and urination, caused by the body's efforts to get rid of excess fluid by increasing urine production

3) Foamy or bubbly urine, a sign that protein is spilling over into the urine from damaged kidneys

4) Swelling in feet, ankles, and legs, caused by buildup of fluid called edema

5) Feeling tired and sluggish all the time, possibly due to anemia

Can a blood test detect kidney problems?

Yes. A blood test can detect kidney problems by looking for biomarkers in the blood that indicate a problem with the kidneys.

Some common biomarkers that may be detected in a blood test include creatinine, urea nitrogen, and albumin. If any of these biomarkers are elevated, it may indicate that there is a problem with the kidneys.

Kidney problems can be detected through blood tests, although the specific tests used will vary depending on the nature of the kidney problem.

Some common blood tests used to detect kidney problems include:

-A creatinine level, which measures how well your kidneys are filtering waste products from your blood

-A BUN level, which measures how much urea (a breakdown product of protein) is in your blood

-An albumin level, which measures how much albumin (a type of protein) is in your urine

-A creatinine clearance test, which measures how much creatinine is cleared from your blood per minute

Read Blog

Why Recurring Sore Throat Can Be a Serious Issue

A sore throat is a common complaint. Most of us experience it during seasonal changes, after a cold, or when we catch the flu. But what if your sore throat keeps coming back again and again? While many people dismiss it as a minor irritation, a recurring sore throat can actually signal more serious health issues that require proper attention.

What is a recurring sore throat?

A recurring sore throat refers to repeated or persistent throat discomfort that comes back multiple times in a year or lasts longer than usual. Normally, a viral sore throat improves within a week. If the problem lingers beyond 10 days or returns frequently, it falls into the category of chronic or recurring sore throat.

Why is it serious?

Undiagnosed infections
A single sore throat from a virus is not concerning. But if bacterial infections like strep throat keep coming back, they may damage the throat and spread to other parts of the body if untreated.
Inflammation and tissue damage
Constant irritation from allergies or acid reflux can harm the delicate tissues of the throat. Over time, this may affect your voice and overall throat function.
Underlying medical conditions
Recurring sore throat can be linked to issues like gastroesophageal reflux disease (GERD), allergies, tonsil problems, or immune system weakness. In some cases, it may also be an early warning sign of more serious diseases such as tumors.
Complications
Recurrent infections can lead to abscesses around the tonsils, ear infections, or sinus problems. Inadequate or repeated antibiotic use can also cause resistance.
Impact on daily life
A constant sore throat affects your eating, speaking, sleeping, and quality of life. It leads to repeated doctor visits, discomfort, and stress.

Common causes of recurring sore throat

Bacterial infections like strep throat or chronic tonsillitis
Viral infections that linger or reactivate
Allergies that trigger postnasal drip and throat irritation
Acid reflux or GERD causing stomach acid to irritate the throat
Environmental irritants such as smoke, dust, and pollution
Mouth breathing during sleep due to nasal blockage
Immune weakness making you prone to repeated infections

Warning signs to watch for

You should never ignore these symptoms if they accompany a recurring sore throat:

Sore throat lasting longer than 2–3 weeks
Difficulty swallowing or breathing
Lump or swelling in the throat or neck
Persistent hoarseness or voice changes
Unexplained weight loss
Blood in saliva or phlegm
Fever with night sweats

These are red flags that need immediate medical evaluation.

How lab tests help

Lab tests play a critical role in finding out why you have a recurring sore throat. Some useful investigations include:

Throat swab or culture to identify bacterial infections
Rapid antigen test for strep for quick diagnosis
Complete Blood Count (CBC) to detect infection or immune problems
CRP and ESR to check inflammation
Allergy tests to identify triggers like dust or pollen
Thyroid function tests to rule out thyroid-related throat problems
Reflux evaluation if GERD is suspected
Immune status tests if infections are unusually frequent

Through SecondMedic/Thyrocare, these tests can be arranged easily, giving you faster results and treatment planning.

Treatment and prevention

The treatment of recurring sore throat depends on its cause:

Bacterial infections are treated with antibiotics prescribed by a doctor. Completing the full course is essential.
Viral infections usually require rest, hydration, and symptom management.
Acid reflux can be controlled with lifestyle changes like avoiding late meals, reducing spicy foods, and medications if required.
Allergies can be managed by identifying and avoiding triggers, along with prescribed medicines.
Tonsil problems may require surgical removal if infections are frequent and severe.

Preventive steps include:

Staying hydrated
Avoiding smoking and exposure to polluted air
Maintaining good throat hygiene
Managing acid reflux through diet and posture
Strengthening immunity with balanced nutrition and rest

When to see a doctor

If you suffer from frequent sore throats or if your symptoms come with any red flags, consult a healthcare professional without delay. Early evaluation prevents complications and ensures better outcomes.

Conclusion

Recurring sore throat is more than just an inconvenience. It is often a signal from your body that something is not right. Identifying the cause early and undergoing the right tests can help you recover faster and avoid long-term damage.

At SecondMedic, you can access lab tests, doctor consultations, and treatment guidance all in one place. Don’t ignore a sore throat that keeps returning — take charge of your health today and book your tests with SecondMedic/Thyrocare for accurate results and expert support.

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