Maintaining 100% sensitivity, the highest specificity was reached with a cut-off value for D-dimer equivalent to the age × 25 µg/L in low-risk patients (67.1% specificity) and the age × 10 µg/L (50% specificity) in intermediate-risk patients .
The specificity of age-adjusted D-dimer values was similar or higher for each age group studied compared with traditional cutoff, without significantly compromising sensitivity. Overall, had decade age-adjusted cutoffs been used, 37 CTPAs could have been avoided (19.6% of 189 patients aged >60 years with Wells score?4) had yearly age-adjusted cutoffs been used, 52 CTPAs (18.2% of.
The sensitivity and specificity of the age-adjusted D-dimer was calculated using bootstrapping. With an assumed 99% sensitivity for the conventional D-dimer cut-off the specificity was 39.2% [95% confidence interval (CI): 37.5-41.0%].
Limited data exist on D-dimers with cutoffs set at 250 ng/mL. Retrospective studies suggest that in this case, the age-adjusted cutoff is “age per 5”, meaning that you can rule out PE in a patient of 60 years if the result of the test is less than 300 ng/mL.
Age-Adjusted D-dimer Calculator for VTE – MDApp, Age Adjusted D-Dimer Testing – REBEL EM – Emergency …
Age-Adjusted D-dimer for Venous Thromboembolism (VTE) – MDCalc, Age-adjustment of the D-dimer cut-off value to improve the …
4/28/2014 · D-dimer has been shown to increase with age, which can cause a lower specificity ( i.e. more false positive tests) in older patients. Specificity can range from 49 – 67% in patients ? 50 years of age, but in older patients (i.e. ? 80 years of age) the specificity is quoted as 0 – 18%. The result of this is, older patients often have more diagnostic …
1/25/2021 · The conclusion was similar to us. Moreover, age-adjusted D-dimer value was calculated as patients’ age times 0.01(?g/mL) by Schouten et al. . They drew conclusions that age-adjusted D-dimer value can increase specificity, whereas sensitivity was.
We note that other studies finding higher sensitivity with an age – adjusted D – dimer cut-off included patients less than 50 years in their cohorts. [5] [6] [7][8] The test-characteristics of an age …
The age-adjusted D-dimer cut -offs were found to be more specific as the age of the patient increases, with minimal reduction in sensitivity and so can prevent unnecessary testing in low and moderate risk patients. Modern D-dimer assays have almost perfect sensitivities. D-dimers are a by-product of fibrinogen breakage following excessive coagulation.
3/28/2020 · The age-adjusted D-dimer calculator helps you calculate the D-dimers cutoff level for your age. Lower D-dimers may be helpful in ruling out a Pulmonary Embolism (PE) or Deep Vein Thrombosis (DVT) diagnosis. This calculator is suitable for people who are at least 51 years old. There are different methods of calculating the D-dimer cutoff level and diagnosing PE if you are younger or pregnant.
