case_images: PMC9833929_01
case_images: Our patient presented with the blue/purple shade of skin characteristic of congenital methemoglobinemia.
case_images: CRIA2023-3474638.001.jpg
case_images: PMC9833929_01_CRIA2023-3474638.001.jpg
case_images: fig1
case_images: The patient was an otherwise healthy 15-year-old, 60 kg, Caucasian female (Figures 1 and 2), diagnosed with methemoglobinemia at birth after she was noted to have a "blue hue" without any accompanying symptoms.
case_images: Cyanosis from congenital methemoglobinemia may also result in discoloration of the extremities and nails.
case_images: CRIA2023-3474638.002.jpg
case_images: PMC9833929_01_CRIA2023-3474638.002.jpg
case_images: fig2
case_images: The patient was an otherwise healthy 15-year-old, 60 kg, Caucasian female (Figures 1 and 2), diagnosed with methemoglobinemia at birth after she was noted to have a "blue hue" without any accompanying symptoms.
case_images: A standard pulse oximetry reading on room air.
case_images: CRIA2023-3474638.003.jpg
case_images: PMC9833929_01_CRIA2023-3474638.003.jpg
case_images: fig3
case_images: Pulse oximetry on room air revealed an oxygen saturation (SpO2) of 12%-35% (Figure 3), taken on all extremities.
case_images: Our co-oximeter screen displaying pulse and cerebral oximetry values.
case_images: CRIA2023-3474638.004.jpg
case_images: PMC9833929_01_CRIA2023-3474638.004.jpg
case_images: fig4
case_images: Cerebral oximetry, measured with an O3 near-infrared spectroscopy (NIRS) module, revealed values between 40% and55% (Figure 4). As shown in Figure 4, cerebral oximetry values were visible, but the monitor was unable to detect the patient's methemoglobin level.