All I know is PSA - protein-specific antigen. It's a test for prostate cancer.

TST = Thiosulfate sulfurtransferase
fT3 = free Triiodothyronine
fT4 = free Thyroxine
PSA = Prostate-specific antigen
CEA = Carcinoembryonic antigen

Tetrasilver Tetroxide Test könnte TST sein, kommt auch aus dem Bereich AIDS/Krebsbekämpfung?? aber ich hab das nur ergoogelt und bin kein Fachmann. Insofern nur ein kleiner Tipp.

Normalerweise würde zur Bestimmung von T3 und T4 TSH passen, thyroid stimulating hormone. Die beiden anderen Vorschläge erscheinen mir exotisch

The Parks-Bielschowsky three-step test (TST) can incorrectly indicate that a superior oblique muscle is paretic in patients with restrictive strabismus. Although this pitfall in diagnosis has been widely reported, no large studies have examined the incidence of a positive TST in patients with Graves disease.
http://www.ncbi.nlm.nih.gov/pubmed/19145130

at least slightly related to hyperthyroidism...
But obviously it has to do with eye muscle function in Graves´ ophtalmopathy rather than endocrinology lab tests.

Thought of "TSH-Test" too (cf. Miss Take´s #4), could´t find a reliable source, though...

TST = testosterone = TST
TSH = thyroid stimulating hormone = TSH
fT3 = free T3 = FT3
ft4 = free T4 = FT4
PSA = prostate-specific antigen (sorry, Bill, not protein) = PSA
CEA = carcinoembryonic antigen = CEA

you need to check whether this is a typo for TSH (thyroid function) which would be logical preceding free T3/T4 or whether it really does refer to testosterone ... (IMHO #2, #3 and #5 for TST are off-beam, here)

What are the results/reference range?

"TST = testosterone = TST"

Oh boy, a perfect example of not seeing the wood for the trees...