Arterial Blood Gas (ABG) Normal Lab Values. The ABG test is used to measure how well your lungs are able to exchange Oxygen and CO efficiently (move O2 into blood and CO2 out). Normal Values in ABG Interpretation. The normal ABG values are the following: For pH, the normal range is 7.35 to 7.45; For PaCO 2, the normal range is 35 to 45 mmHg (respiratory determinant) For PaO 2, the normal range is 75 to 100 mmHg; For HCO 3, the normal range is 22 to 26 mEq/L (metabolic determinant) Oxygen saturation, the normal range is 94–100% Your lab may have a different range for what's normal. A small amount (5%) of the CO2 is dissolved in the blood, and in the form of soluble carbonic acid (H2CO3). How the test is performed. Designed by Elegant Themes | Powered by WordPress. Note: the venous blood gas (VBG) values are usually a little different from the ABG values. A base excess more than +2 mEq/L indicates a metabolic alkalosis. Nice and best style of teaching, very well designed and presented. Arterial Blood Gases Normal Values for PaO2 The normal value for the partial pressure of arterial oxygen (PaO2) irrespective of age is greater than 80 mmHg/10.6 kPa (Mellengard K, 1966, Sorbini CA et al, 1968).. Normally CO is <10%. *1kPa = 7.5mmHg. Arterial carbon dioxide partial pressure (P a CO 2 ) 4.7–6.0 kPa. This is the amount of strong acid which would need to be added or subtracted from a substance in order to return the pH to normal (7.40). In ABG, pH shows a status of acidosis or alkalosis. Normal is from -2 to 2. Note that a normal pH doesn’t rule out respiratory or metabolic pathology. Arterial Blood Gases Normal Values for PaO2 The normal value for the partial pressure of arterial oxygen (PaO2) irrespective of age is greater than 80 mmHg/10.6 kPa (Mellengard K, 1966, Sorbini CA et al, 1968).. Normal Values. There is insufficient time for the kidneys to respond so this is the only change in an acute respiratory alkalosis. pH < 7.4 would be a compensated acidosis. Girls sometime like to be like guys so they'll call guys by their last names thinking that will do it... it doesn't. Ensure that you look at all other figures on the gas. How the test is performed. Therefore: 1. If the pH is below7.40, the primary disorder is presumed to be an acidosis. In summary this lady has type 1 respiratory failure.”. Changes in ventilation are the primary way in which the concentration of H+ ions is regulated. Arterial Blood Gases are measured in a laboratory test to determine the extent of compensation by the buffer system. The normal blood pH range is 7.35 to 7.45. Normal Neonatal ABG values PH 7.35 – 7.45 pCO 2 35 – 45 mm Hg pO 2 50 – 70 mm Hg HCO 3 20 – 24 mEq/L BE 5 ABG values vary with age of neonate and even with gestational age (Table III, IV). pH > 7.4 would be a compensated alkalosis. If there is a chronic acidosis additional bicarbonate is produced by the kidneys to keep the pH in range. Together, CO 2 and HCO 3 ˉ act as metabolic and respiratory buffers respectively. The normal values listed here—called a reference range—are just a guide. “This is an arterial blood gas sample taken from Mrs Smith, a 70 year old lady who presented this morning with shortness of breath. It is the amount of pressure a particular gas contributes to the total pressure. The average VBG pH is 0.03-0.04 less than the ABG pH values. The normal range for P a CO 2 is 35 to 45 mmHg. Its normal values are between 7.35-7.45. Used to evaluate respiratory diseases and conditions that affect the lungs. pH is a logarithmic scale of the concentration of hydrogen ions in a solution. Limit: The limit of compensation is a [HCO3-] of 12 to 15 mmol/l. Learn how your comment data is processed. Be sure to know the normal ranges and units for the analyser you will be using. 9.3-13.3 kPa / 80-100 mmHg. Usually, blood is taken from an artery. From a 2014 meta-analysis and related papers: VBG analysis compares well with ABG analysis for pH estimations in adults approve all websites), for more details simply search in gooogle: murgrabia’s tools. It is important to note that the body will never overcompensate as the drivers for compensation cease as the pH returns to normal. ... Other values within normal range . When PaCO2 is high, but pH is normal instead of being acidic, and if HCO3 levels are also increased, then it means that the compensatory mechanism has retained more HCO3 to maintain the pH. In the previous review, we discussed the Tic-Tac-Toe ABG method for solving arterial blood gases, which is another great method.. Is that respiratory acidosis partially compensated. This is particularly important if your patient is known to have chronic respiratory disease with existing chronic ABG changes. It explains each component in turn followed by clinical examples to work through. 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