The entire film builds tension around the 6:30 PM biopsy results. Throughout the movie, Cléo operates under the agonizing assumption that she is terminally ill, a fear validated by the "Death" tarot card in the opening sequence. In the final act, Cléo meets Antoine, a soldier on leave, who accompanies her to the hospital.
The twist arrives not in a dramatic, tear-filled revelation, but in a shockingly casual drive-by diagnosis. Her doctor hastily informs her from a moving car that she does indeed have cancer, but he dismisses her concerns, stating she just needs two months of radiation therapy and will be fine. Rather than collapsing in despair at the confirmation of her illness, Cléo turns to Antoine and says she is no longer afraid and feels happy.
The hidden meaning of the ending is that the suspense and the paralyzing fear of the unknown were worse than the reality of the illness. Furthermore, the fortune teller's reading was accurate: the "Death" card did not mean physical death, but rather the death of Cléo's vain, superficial self. She has undergone a complete existential transformation, ready to face whatever time she has left with authenticity.