.pt is the Internet country code top-level domain (ccTLD) for Portugal.

GoldBamboo

... Why get tested?
To check how well blood-thinning medications (anti-coagulants) are working to prevent blood clots; to help detect and diagnose a bleeding disorder

When to get tested?
If you are taking an anti-coagulant drug or if your doctor suspects that you may have a bleeding disorder

Sample required?
A blood sample drawn from a vein in the arm; sometimes blood from a fingerstick
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Lab Tests Online - more...

PT, Pt, or pt may stand for: Capital Cargo International Airlines IATA airl ...
Wikipedia - [full article]

Resources

  • PT (Lab Tests Online)