Treating acidosis depends entirely on what type you have and what’s causing it. Acidosis means your blood has become too acidic, with a pH below 7.35 (normal range is 7.35 to 7.45). The two main categories, metabolic and respiratory, have fundamentally different causes and require different approaches. In almost every case, the most effective treatment targets the underlying condition rather than the acid buildup itself.
Metabolic vs. Respiratory Acidosis
Your body produces two types of acid through normal metabolism. The first is carbon dioxide (CO2), a volatile acid your lungs exhale. Your body generates roughly 15,000 millimoles of CO2 daily. The second type is nonvolatile acids, produced from breaking down proteins and other nutrients, totaling about 70 to 100 millimoles per day. Your kidneys handle this smaller load.
When your lungs can’t clear CO2 fast enough, CO2 builds up in your blood and you develop respiratory acidosis. When your kidneys can’t remove enough acid, or when your body produces excess acid (as in diabetic ketoacidosis or severe infections), you develop metabolic acidosis. The difference matters because if your lungs stopped working entirely, fatal acid levels would build within an hour. Losing kidney function, by contrast, takes days to produce the same degree of acidity, because the daily acid load the kidneys handle is so much smaller.
Treating Respiratory Acidosis
Since respiratory acidosis is caused by inadequate breathing, treatment centers on restoring ventilation. The specific approach depends on the severity and what’s impairing your breathing.
For mild cases, treating the underlying problem may be enough. If a medication is suppressing your breathing drive, adjusting or stopping it can resolve the issue. If a COPD flare-up is the culprit, bronchodilators and steroids may open the airways enough to restore adequate CO2 clearance.
When those measures aren’t sufficient and blood pH drops below 7.35 with elevated CO2, non-invasive ventilation (NIV) becomes the standard intervention. This typically involves a full face mask connected to a pressure-targeted ventilator that helps push air into your lungs. Oxygen levels are kept in a targeted range of 88 to 92 percent saturation, which is deliberately lower than you might expect. In people with chronic lung disease, giving too much oxygen can actually worsen CO2 retention.
For people with neuromuscular diseases or chest wall disorders that weaken the breathing muscles, NIV is often started even before acidosis develops, since these patients are at high risk of CO2 buildup. In the most severe cases, or when NIV fails, invasive mechanical ventilation through a breathing tube becomes necessary. Ventilator settings are adjusted to allow extra time for air to leave the lungs on each breath, using a ratio of at least 1:3 (one part inhale, three parts exhale) and a slower breathing rate of 10 to 15 breaths per minute. In some situations, doctors will tolerate a pH as low as 7.2 to 7.25 rather than push ventilator pressures to dangerous levels.
Treating Acute Metabolic Acidosis
Metabolic acidosis has a wider range of causes, and the treatment strategy varies accordingly. The first step is always identifying why the acid is building up.
Fixing the Root Cause
In diabetic ketoacidosis, insulin and fluids are the primary treatment. When the body can’t use glucose properly, it breaks down fat for energy, producing ketone acids as a byproduct. Insulin reverses this process. The acidosis itself often corrects within hours once insulin is on board. In lactic acidosis from sepsis or shock, restoring blood flow and oxygen delivery to tissues is the priority. Fluids, medications to support blood pressure, and antibiotics (for infection) address the source of excess acid production.
For poisoning-related acidosis, such as from methanol or ethylene glycol ingestion, the treatment targets the toxic substance directly, often with an antidote that blocks the enzyme converting the poison into acid.
When Sodium Bicarbonate Is Used
Sodium bicarbonate is essentially a base that neutralizes acid in the blood. It sounds like a logical fix, but it’s used more cautiously than you might expect. In sepsis-related lactic acidosis, guidelines actually recommend against routine bicarbonate use for improving blood pressure or circulation. The reasoning is that artificially correcting the pH doesn’t fix the underlying problem and can mask how sick someone truly is.
The exception is severe acidosis. When blood pH drops to 7.2 or below and the kidneys are failing, bicarbonate therapy is recommended. In cardiac arrest, it may be given rapidly to counteract the extreme acid buildup that occurs when the heart stops circulating blood.
Even when bicarbonate is appropriate, doctors avoid fully correcting the acid levels in the first 24 hours. Overcorrecting too quickly can swing the blood into an alkaline state, because the body’s breathing rate takes time to readjust. The typical goal is to bring bicarbonate levels up to around 20 milliequivalents per liter by the end of day one, which generally corresponds to a normal pH.
Managing Chronic Metabolic Acidosis
Not all metabolic acidosis is an emergency. Chronic kidney disease is one of the most common causes of a slow, persistent acid buildup. As kidney function declines, the kidneys lose their ability to excrete the daily acid load from your diet. Over time, this low-grade acidosis accelerates muscle wasting, bone loss, and further kidney damage.
Treatment for chronic metabolic acidosis typically involves daily oral alkali supplements. Sodium bicarbonate tablets (available in 325 mg and 650 mg sizes) are the most common option. Some people use sodium bicarbonate powder, where roughly one-eighth of a teaspoon provides about 7 milliequivalents of bicarbonate. Sodium citrate solutions are an alternative, particularly for people who find bicarbonate tablets cause bloating or gas.
Dietary changes can also help. Diets higher in fruits and vegetables produce fewer acid byproducts than protein-heavy diets, since the metabolism of sulfur-containing amino acids (found in meat, eggs, and dairy) generates sulfuric acid. Some studies suggest that increasing plant-based food intake can reduce the acid load enough to slow kidney disease progression, though alkali supplements remain the standard approach when blood bicarbonate levels are consistently low.
Renal Tubular Acidosis
Renal tubular acidosis (RTA) is a group of conditions where the kidneys can’t properly acidify the urine, even though overall kidney function may be relatively preserved. There are several types, each involving a different part of the kidney’s acid-handling machinery. Some forms are inherited, while others develop from autoimmune diseases, certain medications, or other conditions.
Regardless of the type, treatment almost always involves oral alkali therapy with sodium bicarbonate or sodium citrate. The goal is to replace the bicarbonate the kidneys are wasting or failing to generate. This is typically a long-term treatment. People with inherited forms of RTA often take alkali supplements for life, while those with acquired forms may improve if the underlying cause can be addressed.
Acidosis and Dangerously High Potassium
One of the most dangerous complications of acidosis is its effect on potassium levels. When your blood becomes too acidic, potassium shifts out of your cells and into your bloodstream. This is especially pronounced in diabetic ketoacidosis and other conditions involving high blood sugar, where both the acidity and the lack of insulin drive potassium outward. The resulting spike in blood potassium can cause life-threatening heart rhythm problems.
The treatment is to address the acidosis itself. In diabetic ketoacidosis, giving insulin and fluids pushes potassium back into the cells. Paradoxically, even though blood potassium levels may be dangerously high at the time of diagnosis, the total amount of potassium in the body is often depleted. As treatment corrects the acidosis, potassium levels can drop rapidly, so careful monitoring and potassium replacement are usually necessary during recovery.
How Acidosis Is Diagnosed
An arterial blood gas (ABG) test is the primary diagnostic tool. It measures three key values: blood pH (normal 7.35 to 7.45), partial pressure of carbon dioxide or PaCO2 (normal 35 to 45 mmHg), and bicarbonate or HCO3 (normal 22 to 26 mEq/L). A low pH with high CO2 points to respiratory acidosis. A low pH with low bicarbonate points to metabolic acidosis.
For metabolic acidosis, calculating the anion gap helps narrow down the cause. The formula is straightforward: sodium minus the sum of chloride and bicarbonate. A result above 12 mEq/L suggests acids are accumulating in the blood, pointing toward causes like diabetic ketoacidosis, lactic acidosis, kidney failure, or toxic ingestions. A normal anion gap with low bicarbonate suggests the body is losing bicarbonate directly, as happens in diarrhea or renal tubular acidosis. This distinction shapes the entire treatment plan.