The lactate anion is what the ABG machine measures. So, the rapid infusion of Hartmanns will cause a transient increase in the serum lactate levels, without causing a drop in pH.

Is Hartmann's the same as Ringer's lactate?

Vetivex Hartmann's has an electrolyte profile similar to Lactated Ringer's Solution. Lactated Ringer's Solution (LRS) is a modification of Hartmann's Solution and many references discuss their clinical use and clinical effects as if they are the same, including DiBartola's textbook on fluid therapy.

What is Hartmann's fluid used for?

Hartmann's solution and 5% glucose IV infusion is indicated as a source of water and electrolytes. It is also used in patients as a source of bicarbonate in the treatment of mild to moderate metabolic acidosis associated with dehydration or associated with potassium deficiency.