Final answer:
A gene test for TMAU provided initial hope to Graham by potentially confirming the diagnosis and leading to better treatment options. However, disappointment followed possibly due to a lack of clear resolution, the challenging management of TMAU, or hereditary concerns raised by the diagnosis.
Step-by-step explanation:
The gene test for Trimethylaminuria (TMAU) in Graham's case likely provided initial hope because it could confirm a suspected diagnosis, thus leading to a better understanding of the condition and potential treatment options. The subsequent disappointment may have stemmed from several possibilities: the negative result denying a clear diagnosis, the realization that even with a positive diagnosis, management of TMAU is challenging without a definitive cure, or learning of possible hereditary implications which could affect future planning.
For someone like Graham, who may have been battling with unexplained symptoms, a definitive diagnosis can be both clarifying and empowering. However, the intricate nature of genetic conditions means a diagnosis is often just the beginning of a long journey involving managing symptoms and coping with the psychological impact of a chronic condition.