??

00:51 Apr 6, 2015 

Thanks. Maybe shows the asker not to take responses for granted :-)

There's an answer of sorts at http://www.proz.com/kudoz/german_to_spanish/medical_general/... which shows why it's a bad idea to respond to multiple term questions.

It seems as though the asker isn't going to follow your advice.

00:26 Apr 6, 2015 

it becomes "razón normalizada internacional" in full?

No, RIN - Razón/(Ratio) Internacional Normalizada - which, curiously enough, has not appeared in anyone's answers, to date.

ratio internacional normalizada - English translation – Linguee
www.linguee.com/spanish-english/.../ratio internacional nor...
International Normalised Ratio (razón internacional normalizada o RIN) para ... Normalised Ratio [INR] (Razón Internacional Normalizado [RIN]) 2,5 a [...].
Ortopedia - Volume 1 - Page 37 - Google Books Result
https://books.google.cl/books?isbn=9500607913 - Translate this page
Robert H. Fitzgerald, ‎Herbert Kaufer, ‎Arthur L. Malkani - 2004 - ‎Medical
El tiempo de protrombina (TP) y la Razón Internacional Normalizada (RIN) deben ser evaluados antes del bloqueo neuraxial en pacientes con terapia ...
Cuidados perioperatorios en cirugía cardiovascular
https://books.google.cl/books?isbn=950062043X - Translate this page
2000

04:10 Apr 5, 2015 

Hola Fabiana, aquí hay unas reglas, pero eres nueva, las desconoces, recibe un saludo de Pascua.
Hello, Fabiana, here we have some rules, but as you are a new translator in here you do not know these rules very well I wish you a Happy Easter too.

03:51 Apr 5, 2015 

Robin is of course correct but, just to get started, INR is usually left unchanged (even though it becomes "razón normalizada internacional" in full).

00:52 Apr 5, 2015 

May I suggest you have a look here:
http://www.proz.com/?sp=siterules&mode=show&category=kudoz_a...
and then delete this question and post something that's more likely to attract useful answers ...?