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https://www.ncbi.nlm.nih.gov/books/NBK507805/#:~:text=Troponin%20levels%20typically%20start%20to%20elevate%20in%20the,to%2010%20days%20down%20to%20a%20normal%20level.
https://draxe.com/health/troponin-levels/
It takes a few hours for levels to rise after heart cell death begins, so tests are usually repeated. Once elevated above normal levels, troponin may remain high for …
https://www.ncbi.nlm.nih.gov/books/NBK507805/
Troponin levels typically start to elevate in the circulation within 2 to 3 hours of the onset of chest pain. The levels will continue to rise at that time until a peak is reached, generally between 12 and 48 hours. The troponin level will then begin to fall over the next 4 to 10 days down to a normal level.
https://www.ahajournals.org/doi/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://www.healthline.com/health/troponin-levels
Troponin levels can become elevated within 3 to 6 hours after the heart’s been damaged and can remain high for 10 to 14 days.
https://medlineplus.gov/lab-tests/troponin-test/
If even a small level of troponin is found in your blood, it may mean there is some damage to your heart. If high levels of troponin are found in one or more tests over time, it probably means you had a heart attack. Other reasons for higher than normal troponin levels include: Congestive heart failure; Kidney disease; Blood clot in your lungs
https://www.drugs.com/cg/high-troponin-levels.html
Your blood will be drawn and checked for troponin when you arrive. If an elevated troponin level is found, the level may be checked several times over the next few hours. The level may be checked when chest pain or other symptoms are happening. More than one test showing high troponin levels can mean heart damage, such as a heart attack.
https://myheart.net/articles/troponin-levels-the-heart-attack-blood-test/
An elevated troponin is in general concerning for heart damage until proven otherwise. It can be from a heart attack due to a blockage or due to other conditions that place strain on the heart such as heart failure or critical illness. As discussed below there are other, non cardiac causes of a troponin elevation.
https://sites.duke.edu/cicu/files/2019/11/HsTnT-Algorithm.pdf
ED Evaluation Using hsTnT: Symptoms ≥ 3 hours Initial Troponin 3 Hour Troponin 1 Hour Symptoms ≥ 3h Abnormal Indeterminate Ruled Out No Acute Injury/MI hsTnT(0h) 12-51 hsTnT(0h) 6-11 Check 1-hr hsTnT & ECG Check 1-hr hsTnT & ECG 0-1h Delta 3-4 0-1h Delta ≥ 5 hsTnT(1h) ≥ 52 0-1h Delta ≥ 5 0-1h Delta 3-4 0-1h Delta < 3 Check 3-hr hsTnT & ECG
https://www.nbt.nhs.uk/sites/default/files/Trop%20w%20%20header.pdf
hs Troponin T will start to rise 3-4 hours after injury and can stay elevated for up to 2 weeks. Within the normal healthy population 99% of people will have a hs Troponin T <14ng/l Troponin as a marker of Myocardial Infarction
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