# concept[].definition
Critical to keep at body temperature 36-38C

# concept[].definition
Critical ambient - must not be refrigerated or frozen.

# concept[].definition
Critical. Do not expose to atmosphere.  Do not uncap.

# concept[].definition
Critical frozen. Specimen must not be allowed to thaw until immediately prior to testing.

# concept[].definition
Critical refrigerated - must not be allowed to freeze or warm until imediately prior to testing.

# concept[].definition
Container is free of heavy metals, including lead.

# concept[].definition
Protect from light (eg. Wrap in aluminum foil).

# concept[].definition
Keep at refrigerated temperature:4-8C Accidental warming or freezing is of little consequence.

# concept[].definition
Ultra cold frozen -75 to -85C.  Ultra cold freezer is typically at temperature of dry ice.