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https://www.medscape.com/answers/155919-15143/how-often-should-cardiac-troponins-be-measured-after-the-initial-level-is-obtained-at-presentation#:~:text=Serial%20measurement%20of%20cardiac%20troponins%20after%20the%20initial,measurements%20beyond%20the%206-hour%20mark%20should%20be%20obtained.
https://www.medscape.com/answers/155919-15143/how-often-should-cardiac-troponins-be-measured-after-the-initial-level-is-obtained-at-presentation
Serial measurement of cardiac troponins after the initial level is obtained at presentation, 3 to 6 hours after symptom onset, is recommended.
https://www.aacc.org/cln/articles/2014/may/cardiac-troponin
This definition inherently requires at least two cTn results, which can display either a rising or falling pattern, over the initial 6–9 hours after a patient’s presentation (0h) with at least one value above the 99th percentile. This is why serial cTn orders, and not a single isolated cTn order, are essential to good clinical practice.
https://acutecaretesting.org/en/articles/all-you-need-to-know-about-troponin-measurements
Based on current literature and best practices, a time interval of 6-12 hours between sample draws for serial cTn testing seems to provide optimal diagnostic accuracy for most currently used contemporary cTn assays.
https://litfl.com/troponin-in-critical-illness/
Lower sensitivity troponin requires at least 6 hours between time of initial lab and repeat troponin to see a conclusive increase to rule in AMI; Serial sampling of high sensitivity tropinin at 0 and 2 hours can safely rule-out of AMI (can be …
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2776718
Among those who underwent repeated troponin testing, most of the repeated tests were ordered 3 to 6 hours after the first troponin test was performed (Table 3). Among patients who did undergo repeated troponin testing, very few (66 [0.5%]) had a positive test result (troponin level >0.5 ng/mL).
https://www.heart.org/-/media/files/affiliates/mwa/kansas-city/kc-cardiac-and-stroke-symposium/cardiac-troponin-testing.pdf?la=en
and at 3-6 hours later B. Cardiac troponin testing in patients with kidney disease has reduced diagnostic accuracy. Serial changes in troponin greater that 20% are considered significant. Non-acute settings Elevated cTT levels are associated with increased mortality in dialysis patients, critically ill patients, and patients with pulmonary embolus
https://draxe.com/health/troponin-levels/
Doctors usually interpret troponin levels by monitoring how they drop after someone reports chest pains and other symptoms. If levels decrease within 12 hours of symptoms starting, there’s a good chance the symptoms were not caused by a heart attack. If they stay elevated for several days or more, the person likely did experience one.
https://www.ahajournals.org/doi/full/10.1161/circulationaha.111.023697
Previously, clinicians often had to wait an average of 6 hours with the lower-sensitivity, lower-precision cTn assays to see a conclusive increase in plasma cTn levels after the first troponin measurement, but today's high-sensitivity cTn tests that are separated by a mere 2 to 3 hours can be highly informative.
https://allnurses.com/times-drawing-troponin-series-t709549/
The first draw is 0-hr and the next two are in relation to it. Draw at the zero hour mark (initial eval), the 3-hr mark, and the 6-hr mark. (So, in case that is not clear, if the first draw is at 1400, the second will be at @ 1700 and the third will be at 2000). Bring this to your manager's attention for education.
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