Kidney Function Test

Kidney function test are blood tests that evaluate how well your kidneys are working. The tests measure levels of various substances, including several minerals, electrolytes, proteins, in the blood to determine the current health of the kidneys.
Kidney function tests are required when symptoms of kidney disorder, like urinary tract infection, diabetes, high blood pressure, kidney stones, and excessive use of painkillers, are noticed. Frequent urination, blood or pain while passing urine, swelling of hands and feet are common symptoms.

Types of kidney function tests.

Your doctor may order one or more different types of kidney function tests. You may have blood tests for kidney function, such as:

• Blood urea nitrogen (BUN) measures nitrogen (made from protein breakdown) in your blood.
• Estimated GFR (eGFR) calculates filtration rates based on protein levels, age, race, gender, size and race.
• Serum creatinine looks for the buildup of creatinine, a waste product from muscle tissue breakdown.

Your healthcare provider may also use 24-hour urine tests, including:

• Microalbuminuria looks for a specific protein called albumin.
• Urinalysis evaluates your urine for proteins, blood, and function.

What happens during a KFT Test?

During a KFT Test, a lab technician will collect blood from a vein, typically from the inside of your elbow or from the back of your hand. The test will take only a few minutes. The technician:

• Cleans your skin with an antiseptic wipe
• Places an elastic band, or tourniquet, around your upper arm to help the vein swell with blood
• Inserts a needle in your vein and collect a blood sample in one or more vials
• Removes the elastic band
• Covers the area with a bandage to stop any bleeding
• Place a barcode on your blood sample vial and send them to a lab for analysis

A blood test can be slightly uncomfortable. When the needle punctures your skin, you might feel a prick or pinching sensation. Some people also feel faint or light-headed when they see blood. Afterward, you may have minor bruising, but it will clear up within a few days.

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