Diagnostic marker for vascular endothelial injury

A method for diagnosing vascular endothelial injury comprising:

• a) measuring a serotonin level in a platelet poor plasma sample obtained from a subject,
• b) measuring a serotonin level in a whole blood, serum or platelet sample obtained from the same subject at the same time as the platelet poor plasma sample,
• c) calculating the ratio of the serotonin level measured in a) to the serotonin level measured in b), and
• d) comparing the ratio calculated in c) to a mean ratio of the serotonin level in platelet poor plasma samples obtained from normal subjects to the serotonin level in whole blood, serum or platelet samples obtained from the same normal subjects,
• wherein the serotonin levels are measured by the same method, and an elevated ratio obtained from the subject compared to the mean ratio obtained from the normal subjects indicates vascular endothelial injury.

A method for diagnosing vascular endothelia injury comprising:

• a) measuring a serotonin level in a platelet poor plasma sample obtained from a subject,
• b) measuring a serotonin level in a whole blood, serum or platelet sample obtained from the same subject at the same time as the platelet poor plasma sample,
• c) calculating the ratio of the serotonin level measured in a) to the serotonin level measured in b), and
• d) comparing the ratio calculated in c) to the ratios of the serotonin levels in platelet poor plasma samples to the serotonin levels in whole blood, serum or platelet samples obtained at prior times from the same subject,
• wherein serotonin levels are measured by the same method, and wherein an elevated ratio as compared to the ratios obtained at prior times indicates progress of vascular endothelial injury.