Learn Spanish (Spain): La médica de urgencias nunca pierde la calma. - The emergency doctor never loses her calm.

In Spain, urgencias (plural) is the standard term for the emergency department or ER in a hospital. So, a médica de urgencias refers specifically to an ER doctor. The singular phrase de urgencia is generally used as an adverb meaning 'urgently' or 'in a rush'.

Why does the sentence use la calma instead of su calma for 'her calm'?

Just like with body parts and clothing, Spanish often uses the definite article (la) instead of a possessive adjective (su) for abstract personal states or qualities, as long as it's clear who the quality belongs to from the context of the sentence.

Is la médica the standard way to refer to a female doctor?

Yes. La médica is the standard, fully accepted term for a female doctor. While you might still occasionally hear la médico, médica is grammatically correct and the preferred form in modern Spanish.