amphibian

One or more of the following: 

• 2 cups to 1 quart of GI content
• 20 mL water
• 500 g feed
• 2-4 flakes hay
• 10 g bait material

One or more of the following*: 

• 1 mL serum and/or 0.5 mL EDTA whole blood
• 5 g fresh liver
• 50 mg fresh liver biopsy (approx. 3 Tru-Cut samples, no fluid added)
• 500 g feed

For birds, 0.6 mL EDTA or heparinized whole blood is adequate.

*Serum selenium provides current day levels, while whole blood selenium indicates selenium status over a longer period of time. TVMDL can interpret both serum and whole blood selenium concentrations for cattle, horses, sheep, birds or white-tailed deer. For goats, TVMDL has reference values for serum or plasma only.

One or more of the following: 

• 1 mL serum or plasma
• 5 g fresh liver
• 50 mg fresh liver biopsy (at least 3 Tru-Cut samples, no fluid added)
• 500 g feed

For birds, 0.3 mL serum or plasma is adequate.