This time last year, Gallacher was fighting the viral infection sarcoidosis and even had a biopsy to test for cancer.

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Within four hours a doctor from California and a woman from Minnesota (not a doctor) responded with the right answer, without knowing the results of a biopsy and a genetic test.

FORBES: How To Get The Right Diagnosis For Free

However there was still no diagnosis - and Blaze was moved to Manchester Children's Hospital where another raft of tests, including a lymph node biopsy and a bone marrow test, were carried out.

BBC: Health

It is difficult to diagnose mitochondrial diseases and the only current test is a muscle biopsy.

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The tests were repeated on rats, and again in test tubes using tissue taken by biopsy from patients undergoing unrelated medical procedures.

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