Shock is a clinical diagnosis with many different causes.
Look for a metabolic acidosis and raised lactate (typically >2 mmol/L [>18 mg/dL]) on an arterial or venous blood gas.[1]Evans L, Rhodes A, Alhazzani W, et al. Surviving sepsis campaign: international guidelines for management of sepsis and septic shock 2021. Intensive Care Med. 2021 Nov;47(11):1181-247.
https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC8486643
http://www.ncbi.nlm.nih.gov/pubmed/34599691?tool=bestpractice.com
[2]Cecconi M, De Backer D, Antonelli M, et al. Consensus on circulatory shock and hemodynamic monitoring: task force of the European Society of Intensive Care Medicine. Intensive Care Med. 2014 Dec;40(12):1795-815.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4239778
http://www.ncbi.nlm.nih.gov/pubmed/25392034?tool=bestpractice.com
[3]McDonagh TA, Metra M, Adamo M, et al. 2021 ESC guidelines for the diagnosis and treatment of acute and chronic heart failure. Eur Heart J. 2021 Sep 21;42(36):3599-726.
https://academic.oup.com/eurheartj/article/42/36/3599/6358045
http://www.ncbi.nlm.nih.gov/pubmed/34447992?tool=bestpractice.com