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Using corrected serum chloride and predicted bicarbonate concentrations to interpret acid‐base status in dogs
Author(s) -
Meltesen Holly S.,
Bohn Andrea A.
Publication year - 2012
Publication title -
veterinary clinical pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 51
eISSN - 1939-165X
pISSN - 0275-6382
DOI - 10.1111/j.1939-165x.2012.00469.x
Subject(s) - anion gap , chemistry , serum chloride , bicarbonate , chloride , acid–base homeostasis , sodium , electrolyte , base (topology) , acid–base reaction , albumin , sodium bicarbonate , medicine , biochemistry , metabolic acidosis , mathematical analysis , mathematics , organic chemistry , electrode
Background Changes in water balance and the presence of unmeasured anions perturb the inverse relationship between serum chloride (Cl) and bicarbonate ( HCO 3 ) concentrations in people, affecting accurate interpretation of acid‐base status. Objectives The aim of this study was to demonstrate that corrected serum Cl and predicted HCO 3 concentrations, based on serum sodium (Na) concentration and anion gap ( AG ), would be inversely correlated and could be used to better characterize causes of acid‐base disorders in dogs. Methods In this retrospective study, electrolyte data from dogs with at least one abnormality in serum Na, Cl, or HCO 3 concentrations were analyzed. Profiles were classified before and after calculations using 2 methods, a modified Feldman and an institutional method, to correct Cl concentration and predict HCO 3 concentrations based on Na concentration and AG . Dogs were classified as low (L), normal (N), or high (H) based on Cl (first letter) and HCO 3 (second letter) concentrations, as follows: LL , LN , LH , NL , NN , NH , HL , HN , or HH . Results For profiles from 261 dogs, reclassifying corrected Cl and predicted HCO 3 concentrations resulted in a shift from the initial classification into a different one in 73% of dogs; in most cases, the shift was to LH , NN , or HL categories. Albumin concentration was a significant factor in acid‐base balance. Conclusions When interpreting acid‐base status based on results of a standard biochemical panel, erroneous conclusions can be drawn if concentrations of Na, unmeasured anions, and albumin are not taken into account. The inverse relationship between serum Cl and HCO 3 concentrations may be used to identify frequent acid‐base disorders as well as to unmask abnormalities obscured by irregularities in water balance or AG .