When one is waiting for a medical test result, which tehillim is it customary to recite?
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The Minhag at the Yeshivos where I learned as a Bochur was to recite numbers 121, 130 and 142 followed by the pesukim of "temanya Apei" (eight facets, ie eight pesukim for each letter) of tehilla #119 with the letters corresponding to the name and mothers name. One important thing to bear in mind is that as long as a definite diagnosis hasn't been confirmed the collaborative efforts and zechuyos of the Tehillim said along with a genuine acceptance to take on an extra detail in the service of Hashem (eg to read the bracha "Asher Yotzar" with concentration from a printed text) has a much stronger change of success of overturning the gezeira than once the diagnosis is confirmed a miracle is needed.
One may not think as he recites Tehillim that they are a cure. (see here).
Tehillim are essentially praise of Hashem which can be followed by a prayer for healing. see here.
Therefore I suggest that you say the Tehillim which arouse you most to the praise of Hashem.