NBME Answers : schistosite's page

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submitted by mcdumbass(28), visit this page

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I thought thought measuring a gas in the blood only measures partial pressure of dissolved gas in the blood

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schistosite Yeah, me too...the fact that they expect us to assume that HCO3- is counted in their measurement for CO2 concentration is absolutely absurd. +3

happyhib_ they tell you measured is around 24 and 22 or some bs but give "mM"; if you look at the lab sheet HCO3 has a units in mM and normal is 22-28 = they are not just looking at partial pressure's. +2

an_improved_me Yea,.. Suprisingly in clinic, when you are measuring important parameters in the blood (think fish-bone diagram), you actually use HCO3- as an approximation for CO2 in the blood (so you use the value in CO2 when calculating like the anion gap or something) +1