biocrates kits have been specifically validated for use with plasma and serum. However, a wide variety of other sample matrices can be analyzed using the kits. Essentially any samples with endogenous metabolites can be analyzed with the correct preparation.
For most kits, protocols for the following matrices are available:

• Tissue
• Urine
• Fecal
• Cell culture
• Dried blood spots
• Cerebrospinal fluid

If you are interested in other matrices, please contact biocrates support!