Optimal Result:
19 - 25 mmol/L.
HCO3- - Arterial on Labcorp's Arterial Blood Gas (ABG) Panel
The HCO3- - Arterial marker on Labcorp's Arterial Blood Gas (ABG) Panel measures the concentration of bicarbonate ions (HCO3-) in the arterial blood. Bicarbonate plays a crucial role in maintaining the acid-base balance of the body, functioning as a buffer to regulate the pH of blood. It helps neutralize excess acids or bases, thus stabilizing the body’s pH levels. HCO3- is closely linked with the respiratory system's ability to excrete CO2 and the kidneys' ability to excrete or retain bicarbonate, making it a key indicator of both metabolic and respiratory health.
Clinical Significance
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Elevated HCO3- (Metabolic Alkalosis): High levels of bicarbonate can occur in conditions such as chronic vomiting, excessive antacid use, or kidney disease. It indicates that the body is retaining bicarbonate or losing acids, leading to alkalosis.
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Decreased HCO3- (Metabolic Acidosis): Low bicarbonate levels are commonly seen in metabolic acidosis, a condition where the body accumulates too much acid. Causes include diabetic ketoacidosis, kidney disease, or severe diarrhea, all of which disrupt the body's acid-base balance.
In clinical practice, measuring bicarbonate levels in conjunction with other ABG parameters like pCO2 and pH helps healthcare providers assess the underlying cause of acid-base imbalances and tailor appropriate treatments.
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What does it mean if your HCO3-, Arterial result is too low?
Decreased levels of HCO3- (bicarbonate) in arterial blood, known as metabolic acidosis, indicate an excess of acid in the body or a loss of bicarbonate. This condition disrupts the body's normal acid-base balance and can result from several underlying causes:
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Diabetic Ketoacidosis (DKA): In uncontrolled diabetes, the body breaks down fat for energy, producing ketones, which are acidic, leading to a decrease in bicarbonate levels.
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Chronic Kidney Disease: The kidneys are unable to excrete enough acid or retain sufficient bicarbonate, leading to metabolic acidosis.
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Lactic Acidosis: Caused by an accumulation of lactic acid in the blood, often due to conditions like sepsis, shock, or intense exercise, which overwhelms the buffering capacity of bicarbonate.
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Diarrhea: Severe diarrhea can lead to the loss of bicarbonate from the digestive tract, causing a decrease in bicarbonate levels.
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Toxic Ingestion: Ingesting substances like methanol, ethanol, or salicylates (aspirin) can increase the production of acid in the body, lowering bicarbonate levels.
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Starvation or Malnutrition: Prolonged fasting or inadequate food intake can lead to the production of ketones from fat metabolism, contributing to acidosis.
Decreased bicarbonate levels indicate a disruption in the body's ability to buffer acid, and identifying the underlying cause is essential for proper treatment and correction of the imbalance.
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