DLD Nor-Metanephrine in Plasma ELISA

STORAGE AND STABILITY

On arrival, store the kit at 2 - 8 °C. Once opened the kit is stable until its expiry date. For stability of the ready for use reagents: See vial labels. For stability and storage of prepared reagents refer to 6.1 Preparation of Reagents.

SPECIMEN COLLECTION AND STORAGE

Plasma 

EDTA plasma should be used. 

Drugs, alcohol and tobacco as well as stress influence the catecholamine release. This may lead to false positive results for metanephrine and normetanephrine. If clinically acceptable, medication (i.e. L-Dopa, alpha-blocker, antidepressants, MAO inhibitor, etc.) should be stopped five days before blood collection. Patient should adhere to an at least four hours fasting; no tea, coffee, alcohol, nicotine and no strong physical activity. 

It is recommended to let the patient rest for 20 to 30 minutes after the venipuncture and before collecting the blood sample. The samples can be stored up to 6 hours at 2 - 8 °C. For a longer storage the samples must be frozen at -20 °C and are stable for at least 12 months. Repeated freezing and thawing should be avoided.