Monitoring-device and lab-test interference in the ProvayBlue label
Section 5.5 of the January 2024 ProvayBlue label, for an intravenous prescription product, describes possible underestimation of oxygen saturation by pulse oximetry in the presence of methylene blue in the blood.
Section 5.5 also reports falls in the Bispectral Index (BIS), an index used in anesthesia monitoring, following administration of methylene blue class products. Separately, section 5.7 describes possible interference with urine tests that rely on a blue indicator.
These statements describe information in the cited prescribing label. They do not determine whether an individual device reading or laboratory result has been affected.
This page provides a descriptive summary of the cited sources, not medical advice, dosing guidance, or instructions for product use or medical action. References to a prescription product concern that product and the cited label version. Source citations do not imply endorsement of MB Dose Log.