Answer
The concentration of hydronium ion $(H_3O^+)$ of the blood plasma of this patient is equal to $1.2 \times 10^{-7} \space M$.
Work Step by Step
$$[H_3O^+] = 10^{-pH} = 10^{-6.92} = 1.2 \times 10^{-7} \space M$$
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