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Chest Investigation

Blue Horizon Medicals

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Investigation of Chest Wall Pain

Chest Investigation

It is difficult to be certain what is causing your son's pain without seeing him - but the history, duration of symptoms, and negative ECG, do suggest costochondritis to me also.
Alternative diagnoses might include chest wall muscle strain, pleurisy (essentially chest wall inflammation associated with a lung infection), myocarditis or endocarditis (inflammation of the heart).
Any heart related problem would generally show signs on an ECG, and if it was endocarditis or myocarditis, the patient would generally be more unwell than you have described him as being.
Blood tests that can show recent heart muscle damage include CK-MB (peaking at 48hrs), lactate dehdrogenase and troponin. Creatinine kinase levels rise if there is any muscle inflammation (including heart). CRP levels are useful pointers to inflammation from some cause - but are non specific.
If your son continues to improve I do not think testing is essential. However, if you wish to be certain there has been no acute heart or other muscle injury or inflammation, I would suggest, in order of preference:
Troponin levels - these peak at 48hrs and return to normal 5-14 days after the injury.
CK (with CK-MB fraction) - peak at 24hrs and drop to normal after a few days....CK is a general test of muscle damage, CK-MB is specifically heart muscle. But troponin testing is probably more reliable.
CRP - decline to normal a week or so after the problem subsides.
I hope this helps - but if he is improving steadily, the likelihood is that the doctors he has seen were right and that the illness was not a serious one.
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Other Blood Testing Services by Blue Horizon Medicals.
All of the services outlined above rely on the postal service not just to send the kits to you, but also to get your blood back to the Laboratory.This is fine for the majority of tests on this website but sometimes a test that you require will have special handling requirements such as freezing, a need to be spun down by a centrifuge, or have a need for immediate testing. In these situations, and also where turnaround time cannot be reliant on the postal service we recommend that you speak to us about the other services that we can offer you. For speed we recommend our London Service, but we have some good profiles available through 60 Spire and BMI Hospitals across the UK.