TMAO (Trimethylamine N-oxide)

9 days

Nuclear magnetic resonance (NMR)

Accredited Laboratory Partner

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Marker of cardiovascular risk linked to gut microbiome.

Serum or Plasma

1 mL

Spun NMR LipoTube (black-and-yellow-top tube) is the preferred container, lavender-top (EDTA) tubes or plain red-top (no gel) tubes are also acceptable specimens.

No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.

Keep NMR LipoTube (black-and-yellow-top tube) upright at room temperature for 30 minutes and allow to clot. Centrifuge at 1800 to 2200 g for 10 to 15 minutes immediately after clotting. If the sample cannot be centrifuged immediately, it must be refrigerated at (2°C to 8°C) and centrifuged within 24 hours of collection. The NMR tube should then be stored at (2°C to 8°C) until shipped. Do not open NMR LipoTube. For specimens collected in plain red-top tube, hold tube upright at room temperature for 45 minutes and allow to clot. Centrifuge specimen after clotting according to manufacturer's specifications. Transfer to a transport tube for storage at (2°C to 8°C) until shipped. Serum drawn in gel-barrier collection tubes other than the NMR LipoTube should not be used. Plasma must be separated from cells within 45 minutes of venipuncture. Send plasma in a plastic transfer tube.