Run Time: 4 minutes
Author: Dr. Jared Scott
- The D-Dimer test is not applicable to high-risk patient populations – due to false negatives – a patient with multiple risk factors should go straight to CT.
- The age-adjusted d-dimer – older people get false positives – above the age of 50 add .1 to the d-dimer for every extra decade of life.
- Study showed that of patients with a d-dimer < 0.50 none got CT scans and there was 1 missed PE. Between 0.50 and a normal age-adjusted d-dimer there was 1 missed confirmed non-fatal PE and 7 missed suspected DVTs. Lastly, of all the patients that got CT scans there was a 0.5% miss rate.
- The study concluded that this was an acceptable sensitivity for the d-dimer – sensitivity is 97% with the age-adjusted d-dimer, a CT scan has 98% sensitivity.
- The age-adjusted d-dimer can help avoid the cost of a CT scan and kidney damage.
Link to Podcast: http://medicalminute.madewithopinion.com/d-dimer/