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The Heidelberg test is a medical diagnostic test used in the diagnosis of hypochlorhydria, i.e. insufficient hydrochloric acid in the stomach, hyperchlorhydria, achlorhydria, and for suspected bile reflux. When performing the Heidelberg test, the patient swallows a small electronic device about the size of a vitamin capsule.
Metabolic alkalosis is an acid-base disorder in which the pH of tissue is elevated beyond the normal range (7.35–7.45). This is the result of decreased hydrogen ion concentration, leading to increased bicarbonate (HCO − 3), or alternatively a direct result of increased bicarbonate concentrations.
This is to maintain the plasma's electrical balance, as the chloride anions have been extracted. The bicarbonate content causes the venous blood to leave the stomach more alkaline than the arterial blood delivered to it. The alkaline tide is neutralised by the secretion of H + into the blood during HCO 3 − secretion in the pancreas. [2]
Abnormal kidney function may cause too much or too little urine to be produced. The ability of the kidneys to filter protein is often measured, as urine albumin or urine protein levels, [2] measured either at a single instance or, because of variation throughout the day, as 24-hour urine tests. [citation needed]
Metabolic acidosis has three main root causes: increased acid production, loss of bicarbonate, and a reduced ability of the kidneys to excrete excess acids. [5] Metabolic acidosis can lead to acidemia, which is defined as arterial blood pH that is lower than 7.35. [ 6 ]
Metabolic alkalosis can be caused by repeated vomiting, [2] resulting in a loss of hydrochloric acid in the stomach contents. Severe dehydration, and the consumption of alkali, [3] are other causes. It can also be caused by administration of diuretics [2] and endocrine disorders such as Cushing's syndrome.
The result can be detected with high levels of lactate and low levels of bicarbonate. This is usually considered the result of illness but also results from strenuous exercise. The effect on pH is moderated by the presence of respiratory compensation. Lactic acidosis is usually the result of tissue hypoxia which is not the same as arterial hypoxia.
Unsuppressed ADH causes a physiologically inappropriate increase in solute-free water being reabsorbed by the tubules of the kidney to the venous circulation leading to hypotonic hyponatremia (a low plasma osmolality and low sodium levels). [2] The causes of SIADH are commonly grouped into categories including: central nervous system diseases ...