Do you have a medical condition like diabetes or high blood pressure? Or does anyone in your family have kidney disease? Then your doctor may have asked you to do a urine test called "uACR." Hearing that name might have scared you a little, "What kind of big test is this?" But there's no need to be scared. This is a very simple urine test that can tell us a lot of valuable information about the health of your kidneys. Today, we'll talk about it all in a very simple way.
What is Urine Albumin-Creatinine Ratio (uACR)?
This name is a bit long, so let's call it uACR. This is a urine test. It basically measures the ratio of things called albumin and creatinine in your urine. Now you may be wondering, "What are these albumin and creatinine?"
Let's understand simply.
- Albumin: This is a very important protein in our blood. It's like a gatekeeper that helps keep things inside our blood vessels. It's made by our liver. Albumin's main job is to stop fluids from leaking out of the blood vessels. It also helps transport things like vitamins, enzymes, and hormones throughout the body.
- Creatinine: This is a waste product that is produced when our muscles work. Our muscles use energy to contract and stretch. Creatinine is a waste product that is produced when that energy is used. This is then added to the blood.
Now look at what happens with two healthy kidneys. Your kidneys are like two super filters. They:
1. Albumin , a valuable protein in the blood, is retained within the body instead of being excreted in the urine.
2. The unwanted waste product called creatinine in the blood is filtered thoroughly and excreted from the body with urine.
However, if there is any damage to the kidneys, the holes in this filter become larger. Then, the albumin that should be kept in the body starts to come out with the urine in small amounts. Also, the creatinine that should be excreted may remain inside the body. It is this imbalance that we measure with the uACR test.
Who is being asked to take this uACR test?
A doctor will usually order this test if they have concerns about the health of your kidneys, especially if you have any of the following conditions:
- Diabetes Mellitus: People with diabetes are at higher risk of kidney damage. Therefore, diabetics are advised to have this test regularly.
- High blood pressure (Hypertension): If blood pressure is not controlled for a long time, it can damage the delicate blood vessels in the kidneys.
- Chronic Kidney Disease (CKD): This test is used to monitor the status of someone who already has kidney disease.
- Heart Disease
- Cirrhosis of the liver
Additionally, this test may sometimes be recommended to assess kidney risk if your Body Mass Index (BMI) is over 30 (obese) , you are a smoker , or you are over 50 years old .
Remember, this test is designed to detect potential kidney damage very quickly, at an early stage. The earlier it is detected, the easier it is for us to treat it to prevent it from getting worse.
How is this uACR test done?
There are several ways to collect this urine sample. Your doctor will tell you which method is best for you.
| Sample type | How to do it |
|---|---|
| "Spot" urine sample | This is the most common method. You give a urine sample once, either when you go to see your doctor or at a lab. It's very easy. |
| Sample with a morning/time frame | You can collect the sample at home. Usually, the first urine sample you give in the morning is the first thing you do. Or, you can collect the sample after not urinating for at least 4 hours. |
| 24-hour urine sample | This is the most accurate method. The lab will give you a large bottle. You should urinate into that bottle every time you urinate for 24 hours. During that time, the bottle should be refrigerated. A doctor will refer you to this method if the results from other methods are abnormal. |
Are there any things I need to prepare for before the test?
Yes, to get the right result, you need to take care of a few small things.
- Drink plenty of water: Since you need to have enough urine to provide the sample, drink plenty of water as usual from the day before the test.
- Avoid strenuous exercise: Avoid strenuous exercise such as running, jumping, or lifting weights for at least 24 hours before the test. This is because strenuous exercise can temporarily increase the amount of albumin in the urine.
- Limit meat intake: Avoid eating meat for at least 24 hours before the test. Eating meat can temporarily change creatinine levels.
Also, there are a few things you should definitely tell your doctor, as these things can affect the results.
- If you are menstruating or bleeding from hemorrhoids.
- If you have a condition such as a Urinary Tract Infection (UTI) , fever , gum infection (Periodontitis) , or viral hepatitis .
If there is blood or bacteria in the urine at this time, the results may be incorrect. Therefore, it is very important to tell the doctor about this in advance.
How exactly do you give a urine sample?
Instructions may vary slightly from lab to lab, but they usually use a method called "Clean Catch." This is something that is done to prevent the addition of germs from outside the sample. The lab will give you a sample cup and sterile wipes.
Here's what to do:
1. First, wash your hands thoroughly with soap.
2. Clean the area around your genitals (where urine comes out) thoroughly with the sterile wipe provided.
3. Start urinating and empty the first urine that comes out into the toilet.
4. Stop urinating midway and hold the sample cup close to the urethra.
5. Urinate until the cup is about half full or until the level indicated by the lab is reached.
6. Then, remove the cup and flush the remaining urine into the toilet.
7. Close the mouth of the cup tightly and give it to the person in the lab.
Although this method may seem a bit cumbersome, it is very important to get the most accurate results.
What do the results say?
The uACR test results are given in milligrams/gram (mg/g). The important thing to remember here is that the lower the uACR value, the better .
What is a normal uACR value?
- A value below 30 mg/g is considered a normal level.
- This means that you have a very low risk of kidney failure, heart attack, or stroke.
- Usually, the doctor may ask you to repeat the test in a few months to confirm the result.
What if the uACR value is higher than normal?
| uACR value (mg/g) | Meaning |
|---|---|
| Between 30 and 299 | This means that you have a moderate risk of developing kidney disease. A small amount of albumin is excreted from the kidneys. The doctor will order another test to confirm this. |
| 300 or more | This means that you are at high risk of developing kidney disease or already have kidney disease. The risk of kidney failure, heart attack, or stroke is very high. |
Don't be afraid when you hear the word kidney disease. A slightly elevated uACR value doesn't mean your kidneys are completely damaged. It's a warning that says, "Pay attention, take action now."
If the results are abnormal, what happens next?
If your uACR result is abnormal, your doctor will first do another test to confirm it. Then, they may recommend a few other tests to further investigate the condition of your kidneys.
- eGFR (Estimated Glomerular Filtration Rate) test: This is a simple blood test that measures how well the kidneys are filtering blood.
- Kidney Ultrasound Scan: This can check the size, shape, and presence of any tumors or blockages in the kidneys.
- Kidney Biopsy: In some rare cases, a very small piece of tissue is taken from the kidney and examined under a microscope.
It is only after these tests that the doctor can come to an accurate conclusion about your condition and decide what treatment you need.
What other symptoms should prompt a visit to a doctor?
In addition to your uACR test results, if you have any of the following symptoms, notify your doctor immediately. These may be signs of kidney disease.
- Changes in urination pattern (urinating more than usual, foamy urine, blood in the urine - Hematuria ).
- Dry skin, itching, or darkening of the skin.
- Frequent feeling of extreme fatigue.
- Nausea and vomiting.
- Swelling of the hands, feet, or ankles ( edema ).
It's normal to feel scared and anxious when you find out that your kidneys are not working properly. At such times, ask your doctor all the questions you have. If necessary, take a family member or close friend with you. They can help you understand and remember what they tell you.
Take-Home Message
- uACR is a simple urine test that tells you a lot of valuable information about the health of your kidneys.
- Especially if you have diabetes or high blood pressure, get this test done at the scheduled time as recommended by your doctor.
- The lower the uACR value, the better. If the value is less than 30 mg/g, it is a very good condition.
- Don't worry if the results are elevated. It means it's time to pay more attention to your kidneys.
- The sooner kidney disease is detected, the easier it is to control it and prevent it from getting worse.
- Please discuss any questions or concerns you have about your test results with your doctor.
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