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Acid–base and blood gases are among the few blood constituents that exhibit substantial difference between arterial and venous values. [6] Still, pH, bicarbonate and base excess show a high level of inter-method reliability between arterial and venous tests, so arterial and venous values are roughly equivalent for these. [44]
Intravenous sodium bicarbonate, also known as sodium hydrogen carbonate, is a medication primarily used to treat severe metabolic acidosis. [2] For this purpose it is generally only used when the pH is less than 7.1 and when the underlying cause is either diarrhea , vomiting , or the kidneys . [ 3 ]
The version with seven tests is often referred to by medical professionals in the United States as the "CHEM-7", or "SMA-7" (Sequential Multiple Analysis-7). [1] The seven parts of a CHEM-7 are tests for: Four electrolytes: sodium (Na +) [2] potassium (K +) [3] chloride (Cl −) [4] bicarbonate (HCO 3 −) or CO 2 [5] blood urea (BU), blood ...
Metabolic acidosis is a serious electrolyte disorder characterized by an imbalance in the body's acid-base balance.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]
High volume hypernatremia can be due to hyperaldosteronism, excessive administration of intravenous normal saline or sodium bicarbonate, or rarely from eating too much salt. [1] [2] Low blood protein levels can result in a falsely high sodium measurement. [4] The cause can usually be determined by the history of events. [1]
A 2004 statement by the European Society for Paediatric Endocrinology and the Lawson Wilkins Pediatric Endocrine Society (for children) uses slightly different cutoffs, where mild DKA is defined by pH 7.20–7.30 (bicarbonate 10–15 mmol/L), moderate DKA by pH 7.1–7.2 (bicarbonate 5–10) and severe DKA by pH<7.1 (bicarbonate below 5).
The standard definition of a reference range for a particular measurement is defined as the interval between which 95% of values of a reference population fall into, in such a way that 2.5% of the time a value will be less than the lower limit of this interval, and 2.5% of the time it will be larger than the upper limit of this interval, whatever the distribution of these values.
The parameter standard bicarbonate concentration (SBC e) is the bicarbonate concentration in the blood at a P a CO 2 of 40 mmHg (5.33 kPa), full oxygen saturation and 36 °C. [13] Reference ranges for blood tests, comparing blood content of bicarbonate (shown in blue at right) with other constituents.