It is important to differentiate between superficial thrombophlebitis and DVT. This is done by:
There is an elevation of D-dimer which is a naturally occurring clot dissolving substance. This test is not conclusive but indicates further testing. It rules out DVT and identifies people at high risk of developing thrombophlebitis.
It is a non-invasive test with very high success rate. It is however operator
This provides visual images of your lungs to show if clots have dislodged to the lungs (PE)