Hello BSN nursing student:-)

  1. Hello, just wanted to say hi:-) And actually I have a question I am doing ABG's and the lab results are 7.37PH, 58 PaCO2, 29 HCO3 and I was wondering why 7.37 PH is acidic ? Our teacher gave us a chart to use and keep and so I look on that chart and its not Respiratory acidosis because its not bigger than 7.35, and it's not Respiratory alkalosis because its not bigger than 7.45 same for metaboiilc acidosis and metabolic alkalosis. Please contact me via pm if anybody knows. Thanks :-)

    Last edit by Silverdragon102 on Oct 15, '07 : Reason: Remove email address as per Terms of Service
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    Joined: Oct '07; Posts: 11; Likes: 1


  3. by   Silverdragon102
    Hi Jill and welcome to the site

    If you check out the General forum and try the search facilities there are a few threads on blood gases
  4. by   Tweety
    Welcome to Allnurses.

    You have to look at the entire picture. Not just the ph.

    The CO2 is greater than 45 and the Bicarb is greater than 26 which would indicate an acidodic state. The ph being normal in this case indicates that the sytems have compensated.

    So the answer is "Compensated Respiratory Acidosis".
  5. by   Diary/Dairy

    Glad to have you here.
  6. by   VickyRN
    Normal pH is 7.35-7.45. The pH of 7.37 falls within the normal range.

    Your PaCO2 & bicarb levels certainly aren't normal, so there is compensation going on.

    To find out if it is originally acidotic or alkalotic state, see what "side" of normal is the pH - on the acidotic "side" or the alkalotic "side?"

    7.35-7.4 - leaning towards acidotic, though normal
    7.45-7.4 - leaning towards alkalotic, though normal

    The pH of 7.37, though normal, is leaning towards the acidotic side, so originally had to be an acidotic state, and is now fully compensated.

    Now we need to determine whether it's respiratory acidosis fully compensated or metabolic acidosis fully compensated.

    PaCO2 - respiratory determinant
    Bicarb (HCO3) - metabolic determinant

    Acidotic for PaCO2 is greater than 45, since normal PaCO2 is 35-45. A PaCO2 of 58 is dangerously high, and acidotic. PaCO2 goes up with acidotic state (and down with alkalotic state).

    Acidotic for bicarb is less than 22, since normal bicarb is 22-26. Bicarb goes down with acidotic state, and up with alkalotic state. A HCO3 of 29 is alkalotic - and compensating for the acidotic PaCO2 of 58.

    Therefore, the answer (as Tweety indicated) is respiratory alkalosis fully compensated.

    For further help, please visit these very useful threads:

    And, welcome to allnurses
  7. by   Adham Ahmed
    VickyRN and Tweety thanks you very much
    And, welcome to allnurses