COVID-19 Vaccine, Testing, Resources & Visitor Policy Updates
Not Feeling Well? Check Your Symptoms with the New Online Symptom Checker.
  • MYCHART LOGIN PAY MY BILL FIND A DOCTOR FIND A LOCATION PATIENTS & VISITORS MEDICAL SERVICES COMMUNITY OUTREACH RESOURCES CAREERS CONTACT US
  • Patients & Visitors
  • Medical Services
  • Community Outreach
  • Resources
  • Careers
MYCHART LOGIN PAY MY BILL FIND A DOCTOR FIND A LOCATION PATIENTS & VISITORS MEDICAL SERVICES COMMUNITY OUTREACH RESOURCES CAREERS CONTACT US
  • Homepage
  • HealthLibrary
  • Symptom
Menu
  • Healthy Lifestyle
  • Diseases & Conditions
  • First Aid
  • Symptoms
  • Tests & Procedures
  • Videos
  • Definitions
  • FAQs

High potassium (hyperkalemia)

Updated: 2020-11-14


Definition

Hyperkalemia is the medical term that describes a potassium level in your blood that's higher than normal. Potassium is a chemical that is critical to the function of nerve and muscle cells, including those in your heart.

Your blood potassium level is normally 3.6 to 5.2 millimoles per liter (mmol/L). Having a blood potassium level higher than 6.0 mmol/L can be dangerous and usually requires immediate treatment.

Causes

Often a report of high blood potassium isn't true hyperkalemia. Instead, it may be caused by the rupture of blood cells in the blood sample during or shortly after the blood draw. The ruptured cells leak their potassium into the sample. This falsely raises the amount of potassium in the blood sample, even though the potassium level in your body is actually normal. When this is suspected, a repeat blood sample is done.

The most common cause of genuinely high potassium (hyperkalemia) is related to your kidneys, such as:

  • Acute kidney failure
  • Chronic kidney disease

Other causes of hyperkalemia include:

  • Addison's disease (adrenal insufficiency)
  • Angiotensin II receptor blockers
  • Angiotensin-converting enzyme (ACE) inhibitors
  • Beta blockers
  • Dehydration
  • Destruction of red blood cells due to severe injury or burns
  • Excessive use of potassium supplements
  • Type 1 diabetes

When to see a doctor

High potassium is usually found when your doctor has ordered blood tests to help diagnose a condition you're already experiencing or to monitor medications you're taking. It's usually not discovered by chance.

Talk to your doctor about what your results mean. You may need to change a medication that's affecting your potassium level, or you may need to treat another medical condition that's causing your high potassium level. Treatment of high potassium is often directed at the underlying cause. In some instances, you may need emergency medications or dialysis.

If you have symptoms of hyperkalemia, particularly if you have kidney disease or are taking medications that raise your potassium level, call your doctor immediately. Hyperkalemia is a serious and potentially life-threatening disorder. It can cause:

  • Muscle fatigue
  • Weakness
  • Paralysis
  • Abnormal heart rhythms (arrhythmias)
  • Nausea

Content from Mayo Clinic
© 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use
About St. Elizabeth
  • About Us
  • Associate Log In
  • Associate Intranet
  • Careers
  • For Health Professionals
  • Foundation
  • St. Elizabeth Physicians
  • Learn More
How Can We Help?
  • Find a Location
  • Find a Provider
  • Frequently Called Numbers
  • Health Library
  • Pay My Bill
  • Pagar Su Factura
  • Site Map
Legal
  • Disclaimer/HIPAA
  • Patient Rights and Responsibilities
  • © 2019 St. Elizabeth Healthcare.
  • All rights reserved. St. Elizabeth Healthcare is a registered 501(c)(3) non-profit corporation serving the Northern Kentucky/Greater Cincinnati region. Tax identification #610445850
Help Us Continue To Provide Quality Care
  • Donate
  • Human Resources
  • Physician Opportunities
  • Volunteer
Visit St. Elizabeth Physicians
Healthy
Headlines
  • Helping you live a better life.
  • View Health Tips
Social
About St. Elizabeth
About Us
Associate Log In
Associate Intranet
Careers
For Health Professionals
Foundation & Donations
Volunteers
Resources
CareGram
Find a Location
Find a Provider
Frequently Called Numbers
MyChart Login
Pay My Bill
Legal
Disclaimer/HIPAA
Patient Rights and Responsibilities
Human Resources
© 2022 St. Elizabeth Healthcare. All rights reserved. St. Elizabeth Healthcare is a registered 501(c)(3) non-profit corporation serving the Northern Kentucky/Greater Cincinnati region. Tax identification #610445850