Metformin associated lactic acidosis

Our story starts in a small village nearby Brno, where the married couple Melitovi are going to have dinner. The husband (45 y/o) has been vomiting the last few days and doesn’t have much appetite. His wife worries about him. When Mr. Melita wants to get up from the chair, he suddenly feels nauseous. He is breathing deeply, he is agitated, confused and his head is spinning. Mrs. Melitová doesn’t hesitate and immediately calls the ambulance. The ambulance crew gathers some information about the patient and finds out that he has type 2 DM and is treated with metfromin. Mr Melita is transported to the emergency department. You are the doctor at the emergency department, what should be your next step?
45
years
man
RR
40 /min
HR
100 /min
SpO2
95 %
BP
110/60 (77) mmHg
Glycaemia
Gly
5,2  mmol/L
Complete blood count
HGB
140  g/L
HTC
0,37
LEU
12  x109/L
PLT
248  x109/L
Biochemical analysis
Na
140  mmol/L
K
4  mmol/L
Cl
102  mmol/L
Mg
0,9  mmol/L
Ca
2,3  mmol/L
Glycaemia
Take a sample
Complete blood count
Take a sample
Biochemical analysis
Take a sample