Metabolic Alkalosis
What is Metabolic Alkalosis?
Metabolic alkalosis is a condition where your blood becomes too alkaline. This happens when your body has too much base or loses too much acid. Your blood pH rises above the normal range of 7.35 to 7.45.
Your body tightly controls its acid-base balance to keep cells and organs working properly. When bicarbonate levels rise or acid levels drop, this balance shifts. Common causes include prolonged vomiting, overuse of diuretics, and loss of potassium or chloride.
Many people develop metabolic alkalosis from medications or medical conditions that affect fluid balance. The condition can be mild and resolve on its own. Severe cases require medical attention to prevent complications like muscle weakness, heart rhythm problems, and confusion.
Symptoms
- Muscle twitching or spasms in your hands, feet, or face
- Weakness and fatigue that makes daily tasks difficult
- Nausea and vomiting
- Confusion or difficulty thinking clearly
- Hand tremors or shaky movements
- Numbness or tingling sensations around your mouth or in your fingers
- Dizziness or feeling lightheaded
- Irregular heartbeat or palpitations
- Muscle cramps or pain
Many people with mild metabolic alkalosis have no symptoms at first. The condition is often discovered during routine blood testing. Symptoms typically appear when the alkalosis becomes more severe or develops quickly.
Concerned about Metabolic Alkalosis? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Metabolic alkalosis develops when you lose too much acid from your body or gain too much base. Prolonged vomiting removes stomach acid and is one of the most common causes. Diuretic medications, often called water pills, can cause excessive loss of chloride and potassium through urine. Overuse of antacids or baking soda adds too much base to your system.
Other risk factors include severe diarrhea, kidney disease, and hormonal disorders affecting aldosterone levels. Low potassium levels contribute to alkalosis because your kidneys hold onto bicarbonate when potassium is depleted. Heavy alcohol use, eating disorders like bulimia, and nasogastric tube suction also increase your risk. Medical procedures that remove stomach contents can trigger the condition.
How it's diagnosed
Doctors diagnose metabolic alkalosis through blood tests that measure your acid-base balance. A basic metabolic panel checks carbon dioxide levels, which reflect bicarbonate in your blood. Elevated CO2 levels above 29 mEq/L suggest metabolic alkalosis. Chloride levels help identify the underlying cause, as many cases involve chloride depletion.
Rite Aid offers testing for metabolic alkalosis through our flagship panel. You can check your carbon dioxide and chloride levels at over 2,000 Quest Diagnostics locations nationwide. Additional tests may include checking your potassium, sodium, and kidney function. Your doctor may also order a urine test to measure chloride excretion and determine the specific type of alkalosis.
Treatment options
- Stop or adjust medications that contribute to alkalosis, especially diuretics and antacids
- Replace lost fluids and electrolytes through oral solutions or IV therapy
- Take potassium supplements if your levels are low
- Take chloride supplements or sodium chloride solution for chloride-responsive alkalosis
- Treat underlying conditions like vomiting, diarrhea, or kidney disease
- Reduce alcohol intake and address eating disorder behaviors if applicable
- Eat potassium-rich foods like bananas, spinach, sweet potatoes, and beans
- Stay hydrated with water and electrolyte-containing beverages
- Monitor your blood levels regularly to track improvement
- Work with a doctor to adjust any medications affecting your electrolyte balance
Concerned about Metabolic Alkalosis? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
The most common cause is prolonged vomiting, which removes stomach acid from your body. Diuretic medications and excessive loss of potassium or chloride through urine also frequently cause the condition. Overuse of antacids or baking soda can add too much base to your system. Any condition that causes significant loss of stomach contents or alters kidney function can trigger metabolic alkalosis.
Blood tests measuring carbon dioxide and chloride levels can detect metabolic alkalosis. CO2 levels above 29 mEq/L indicate the condition. Many people have no symptoms in mild cases, so the condition is often found during routine lab work. If you experience muscle twitching, weakness, confusion, or irregular heartbeat, talk to your doctor about testing.
Mild cases may resolve without treatment once the underlying cause stops. For example, alkalosis from temporary vomiting often corrects itself when you stop vomiting and rehydrate. However, moderate to severe cases require medical treatment to restore electrolyte balance. Ongoing causes like diuretic use or kidney disease need specific management to prevent recurrence.
Focus on potassium-rich foods like bananas, sweet potatoes, spinach, avocados, and beans. These help restore potassium levels that often drop with alkalosis. Stay well hydrated with water and electrolyte beverages. Avoid excessive antacid use and processed foods high in sodium but low in potassium and chloride.
Mild cases are usually not dangerous and often resolve quickly. Severe metabolic alkalosis can cause serious complications including heart rhythm disturbances, seizures, and decreased oxygen delivery to tissues. The condition can also worsen respiratory function. Seek medical attention if you have severe symptoms like confusion, irregular heartbeat, or severe muscle weakness.
Metabolic alkalosis results from too much base or loss of acid from your digestive system or kidneys. Respiratory alkalosis occurs when you breathe too fast and exhale too much carbon dioxide. Blood tests show different patterns for each condition. Metabolic alkalosis typically shows high bicarbonate and chloride abnormalities, while respiratory alkalosis shows low CO2 from hyperventilation.
Yes, diuretics are a common cause of metabolic alkalosis. These medications increase urine production and cause loss of chloride, potassium, and hydrogen ions. Loop diuretics like furosemide and thiazide diuretics like hydrochlorothiazide frequently trigger the condition. If you take diuretics, your doctor should monitor your electrolyte levels regularly to catch alkalosis early.
Recovery time depends on the severity and underlying cause. Mild cases may resolve within a few days once treatment starts and the cause is addressed. Moderate cases might take one to two weeks with proper electrolyte replacement. Severe cases or those related to chronic conditions may require ongoing management and monitoring.
Use diuretics and antacids only as prescribed by your doctor. Stay hydrated and maintain balanced electrolyte intake through a varied diet. If you have conditions causing vomiting or diarrhea, seek treatment promptly. Have regular blood tests to monitor electrolyte levels if you take medications that affect fluid balance or have kidney disease.
Never stop medications without talking to your doctor first. Many cases can be managed by adjusting doses or adding supplements rather than stopping treatment entirely. Your doctor may switch you to different medications or prescribe potassium and chloride supplements. Sudden medication changes can cause other health problems, so always get medical guidance before making changes.