The presence of xanthochromia and an increased D-dimer test in the CSF is indicative of:

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Xanthochromia is the yellowish discoloration of the CSF due to the presence of bilirubin, which is a breakdown product of hemoglobin. Its presence indicates the breakdown of red blood cells, which is common in cerebral hemorrhage. An increased D-dimer test also indicates the presence of blood in the CSF, further supporting the diagnosis of a cerebral hemorrhage.

The Presence of Xanthochromia and an Increased D-Dimer Test in the CSF