Why do doctors check potassium levels?
Sarah Smith
Published Jan 20, 2026
A potassium test may be recommended to help diagnose or monitor kidney disease, which is the most common cause of high potassium levels. Your doctor may also recommend the test if you have heart-related problems, such as high blood pressure (hypertension).
Why would a doctor order a potassium test?
You may have this test to diagnose or monitor kidney disease. The most common cause of a high blood potassium level is kidney disease. Potassium is important to heart function. Your provider may order this test if you have signs of high blood pressure or heart problems.
What do potassium levels indicate?
Too much potassium in the blood, a condition known as hyperkalemia, may indicate: Kidney disease. Burns or other traumatic injuries. Addison's disease, a hormonal disorder that can cause a variety of symptoms including weakness, dizziness, weight loss, and dehydration.
What can happen if your potassium level is too low?
In hypokalemia, the level of potassium in blood is too low. A low potassium level has many causes but usually results from vomiting, diarrhea, adrenal gland disorders, or use of diuretics. A low potassium level can make muscles feel weak, cramp, twitch, or even become paralyzed, and abnormal heart rhythms may develop.
What are signs and symptoms of abnormal potassium?
What are the symptoms of hyperkalemia (high potassium)?
- Abdominal (belly) pain and diarrhea.
- Chest pain.
- Heart palpitations or arrhythmia (irregular, fast or fluttering heartbeat).
- Muscle weakness or numbness in limbs.
- Nausea and vomiting.
Why would your potassium be high?
The most common cause of genuinely high potassium (hyperkalemia) is related to your kidneys, such as: Acute kidney failure. Chronic kidney disease.
What are 3 causes of hyperkalemia?
What causes hyperkalemia?
- Kidney Disease. Hyperkalemia can happen if your kidneys do not work well. ...
- A diet high in potassium. Eating too much food that is high in potassium can also cause hyperkalemia, especially in people with advanced kidney disease. ...
- Drugs that prevent the kidneys from losing enough potassium.
What are the 10 signs of low potassium?
Common signs and symptoms of potassium deficiency include weakness and fatigue, muscle cramps, muscle aches and stiffness, tingles and numbness, heart palpitations, breathing difficulties, digestive symptoms, and changes in blood pressure. If you think you're deficient, contact a healthcare professional.
What is the most common cause of low potassium?
Low potassium (hypokalemia) has many causes. The most common cause is excessive potassium loss in urine due to prescription medications that increase urination. Also known as water pills or diuretics, these types of medications are often prescribed for people who have high blood pressure or heart disease.
How can I raise my potassium quickly?
How to Quickly Increase Potassium Levels in the Body
- Eat a banana or two if you find yourself having leg cramps associated with low potassium levels. The potassium in bananas increases your levels quickly, which will cause the cramps to subside. ...
- Have a salad. ...
- Drink a glass of orange juice. ...
- Take a potassium supplement.
What drugs can cause low potassium levels?
Which medications can lower potassium levels?
- Diuretics. Diuretics like furosemide, bumetanide, hydrochlorothiazide, and chlorthalidone are the main medication-related cause of low potassium levels. ...
- Albuterol. ...
- Insulin. ...
- Sudafed. ...
- Laxatives and enemas. ...
- Risperdal and Seroquel.
Can drinking a lot of water lower potassium?
Excessive water consumption may lead to depletion of potassium, which is an essential nutrient. This may cause symptoms like leg pain, irritation, chest pain, et al. 6. It may also cause too much urination; when you drink lots of water at once, you tend to urinate frequently.
What level of potassium indicates kidney failure?
Blood potassium >5.0 indicates potassium imbalance. Arbitrary thresholds are used to indicate degree of severity, such as mild (>5.0), moderate (>5.5), and severe (>6.0).
What happens if your potassium is high?
Having too much potassium in your blood can be dangerous. Potassium affects the way your heart's muscles work. When you have too much potassium, your heart may beat irregularly, which in the worst cases can cause heart attack. If you think you are having a heart attack, call 911 for emergency help.
How accurate is potassium blood test?
It has been estimated that 60-70% of clinical decisions are based on laboratory results and potassium is among the ten most commonly tested analytes. [1] About 4-32% of all laboratory errors occur during the analytical phase of testing the sample.
What blood test show potassium levels?
An electrolyte panel is a blood test that includes a potassium measurement. In addition to potassium, though, an electrolyte panel also measures chloride, bicarbonate, and sodium.
Who is most at risk for potassium deficiency?
Potassium deficiencies are more common in people who:
- Use certain medicines, such as diuretics.
- Have physically demanding jobs.
- Athletes exercising in hot climates and sweating excessively.
- Have health conditions that affect their digestive absorption, such as Crohn's disease.
- Have an eating disorder.
- Smoke.
How do you keep your potassium levels normal?
Taking water pills or potassium binders, as directed by your healthcare provider. Some people may also need medicine to help remove extra potassium from the body and keep it from coming back. This may include: Water pills (diuretics) help rid your body of extra potassium.
How do you fix low potassium?
Taking potassium supplements can usually correct the problem. In severe cases, without proper treatment, a severe drop in potassium level can lead to serious heart rhythm problems that can be fatal.
What autoimmune disease causes low potassium?
Key Points
- Hypokalemia may occur in patients with lupus nephritis in the absence of renal tubular acidosis (RTA) or other known causes.
- Patients with lupus nephritis and idiopathic hypokalemia have a distinct pattern of markers of autoimmunity.
What cancers cause low potassium?
In SCLC, amongst the important causes of low potassium levels in the blood are adrenocorticotrophic hormone (ACTH)-secreting tumors. Ectopic Cushing's syndrome, secondary to lung cancer, is a rare occurrence with a poor prognosis but may manifest with severe hypokalemia, alongside hyperglycemia and muscle weakness.
What drink is high in potassium?
Drinking fruit and vegetable juices is another easy way to increase your potassium intake. Citrus juices seem to provide the most potassium ( 3 ). For example, 1 cup (240 mL) of 100% orange juice offers about 10% of the DV for potassium, while the same serving of grapefruit juice provides 9% of the DV ( 30 , 31 ).
How do hospitals treat hyperkalemia?
Accepted treatments for hyperkalemia include (1) stabilization of electrically excitable membranes by administration of calcium; (2) shift of potassium from the extracellular to the intracellular compartment by means of sodium bicarbonate, insulin, or albuterol; and (3) removal of potassium from the body by sodium ...
Can dehydration cause high potassium?
The body becomes dehydrated when it loses more fluids than it consumes. When the body doesn't have enough fluids, it can't process potassium properly, and potassium builds up in the blood, which can lead to hyperkalemia. Symptoms of dehydration include excessive thirst, less frequent urination, and darker urine.
Can stress raise potassium levels?
Studies have found that anxiety increases adrenal hormones, which can decrease blood potassium [17]. Avoid or manage stress. Good strategies to manage stress are getting adequate rest, engaging in exercise, relaxation, meditation, etc. Discuss supplemental potassium with your doctor.