What Blood Test Checks For Kidney Function – A renal function test (aka renal function tests, RFTs) is one of the blood tests your doctor may order when you have an illness. This test will be reviewed by your doctor and your team, including your renal nutritionist. Your labs can provide your healthcare providers with information about what’s going on in your body- whether you realize it or not. In this article, we will discuss what are the components of the adult renal function group.

In addition, your doctor may order the test if you have a family history of kidney disease or show signs and symptoms of kidney disease.

What Blood Test Checks For Kidney Function

The renal function group should have a blood sample. This blood sample is taken from a vein in your arm by a phlebotomist.

Solitary Or Single Functioning Kidney

Generally fasting is not required for renal function group. However, it is requested along with other laboratory tests that require fasting.

To fast before the blood test, you should not eat for 8 to 12 hours before the appointment.

It’s important to keep drinking plenty of water before dehydration can negatively affect your heart function test results.

Drink plenty of water to stay hydrated and avoid dehydration. Be sure to follow your doctor’s instructions regarding fluid restriction at this time as well.

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If you don’t have enough water, it can cause damage to your eGFR, sodium, and nitrogen levels.

Renal function tablets can be ordered anywhere from monthly to yearly (once a year). The time depends on the orders of your nephrologist or doctor.

You may already have a heart or kidney function panel if you have told your doctor about a family history of kidney disease, or if you know your own kidney disease symptoms.

However, be prepared to do so if you want to regularly record your renal function.

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We include standard ranges for products. However, it’s important to discuss labs with your own health care provider because each lab and doctor’s office has different ranges.

Also, it’s important to note that some people are “normal” outside of the standard ranges. This will come from your doctor.

Therefore, they are included in this group to assess how well the kidneys handle these waste products.

Blood urea nitrogen, also called urea nitrogen or BUN, measures protein breakdown and muscle maintenance in the body.

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A low-protein diet can lower BUN in people who don’t have diabetes. However, if done incorrectly it increases the risk of protein-energy wasting and malnutrition.

This can increase inflammation and increase kidney damage. Ketoanalogues can also lower BUN levels when combined with a low-protein diet.

One study found that eating meat before taking blood for a creatinine test resulted in higher creatinine levels.

A normal serum creatinine level is between 0.6 – 1.2 mg/dL for men and 0.5 – 1.1 mg/dL for women. However, creatinine can fluctuate for a number of reasons. These factors include gender, age, and employment level.

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Creatinine increases as kidney function decreases. This is because with CKD, the kidneys do not clear waste from the body.

Creatinine levels measured in chronic kidney disease can range from 2.0-15.0 mg/dL depending on the stage and other medical conditions.

Finding other triggers that affect your kidney health may help lower or stabilize creatinine levels. This comes from dietary changes that help promote kidney health.

Albumin is a protein produced in the liver. Serum albumin measures the amount of albumin in the blood.

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It used to be thought that albumin was an indicator of how much protein you were eating. We now know that it is much more than that.

If you have been hospitalized and have access to your hospital labs, check your albumin before, during, and after your hospitalization.

When a person is admitted to the hospital, the body has a lot of inflammation. To be better, the albumin will increase. This can show the healing process using albumin protein.

One of the functions of the kidneys is to balance electrolytes. This is why these electrolytes are included in the renal function group.

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Sodium is the most common molecule in our blood outside of our cells. It helps with muscle function, acid-base balance, phone balance, and osmotic pressure of body fluids.

Many sodium levels are related to the amount of salt in the diet. However, it is more than just that.

Your blood test result is not a reliable measure of your sodium intake. A better measure of your water balance.

If you experience edema or swelling of the extremities and excess fluid, you will notice that the sodium level is low.

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Additionally, sodium levels may be low if you drink a lot of water right before your blood transfusion.

It used to be thought that if your sodium is out of whack you need to eat more/less salt. That may not be the case, and there may be more issues.

Consult a registered dietitian to help assess any factors that may be contributing to low sodium levels before making any dietary changes.

Magnesium is the third most important mineral in our bodies. It acts as an electrolyte and helps with nerve conduction, muscle contraction, and fluid balance.

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The potassium level found in your renal function group or basic metabolic group is between 3.5 – 5.0 mEq/L.

High and low-potassium values ​​should be evaluated immediately with your doctor and medical team because potassium plays an important role in our heart.

Magnesium levels outside the range are a serious concern. Your healthcare provider can follow you up early and recheck your levels.

Your serum bicarbonate (carbon dioxide or CO2) is related to the acid-base balance, or pH level, of your body.

Kidney Function Blood Test

With kidney problems, the bicarbonate level decreases. As a result, the body tends to become more acidic.

Low bicarbonate levels have been linked to an increased risk of kidney problems. This is caused by metabolic acidosis, a common result of chronic kidney damage.

By focusing on renal acid load (or PRAL) in your diet, you can maintain your kidney function with healthy dietary changes.

Chloride is a negatively charged electrolyte. It helps balance your fluids and your acid-base balance.

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Low chloride levels can also be caused by other health issues such as diabetic ketoacidosis, aldosterone deficiency, Addison’s disease, emphysema, or chronic kidney disease.

High nitrogen levels indicate drought. However, it can also indicate health issues including kidney disease due to an imbalance in the acid-base balance that the kidney supports.

Some nephrology clinics have different ranges to include higher ranges of phosphorus in late CKD, around 3.0 – 5.0 mg/dL.

Although phosphorus levels are “excuseable” slightly higher, the International Diabetes and Digestive Diseases Guidelines (KDIGO) advocate for phosphorus in the normal range to prevent disease progression.

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Magnesium is the number one mineral in our body. It helps with many things including bone health and muscle reduction.

As our kidneys help manage our bone health, calcium becomes an important value in monitoring kidney disease.

In many people with CKD, calcium fluctuates outside the range. Magnesium can go above or below the healthy range.

This often leads to the inclusion or avoidance of calcium supplements, depending on your labs and other health conditions.

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Too much calcium can cause calcification in your soft tissues. As a result, the risk of heart disease and stroke increases.

Glucose is the primary source of energy for our body. It is taken from the blood into the cells with the help of insulin.

Also, it is important to know if you fast or not. Only the renal function group does not need to fast.

Fasting glucose is between 70 – 100 mg/dL. For non-fasting glucose, it is normal to have a level at or below 200 mg/dL.

What Does Renal Function Test Indicates?

Next, we will cover some of the other calculations and tests that are included in the renal function group.

A normal GFR is above 90. Some lab reports look for a GFR above 60, because function naturally declines as we age.

GFR is related to stages of kidney disease. Kidney failure is associated with a GFR below 15. However, one low value is not enough to confirm kidney issues.

However, it is important to look at each electrolyte in the equation when evaluating issues of high or low levels.

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Below is a table of reference ranges for tests in the renal function group. There is also a column for the abbreviations you will find.

Depending on your personal medical history, diagnosis and condition, other tests may be performed in addition to the renal function test.

Cystatic C is a protein produced in the body that is used to assess kidney function. With good kidney function, cystatin C levels are always balanced.

It appears to be a better indicator of kidney issues compared to creatinine because it is not as easily influenced by muscle mass (as creatinine is).

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Cystatin C

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