Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Influence of thawing on the measurement of plasma urea concentration. Blood was obtained from C57BL/6 mice for measurement of plasma urea. After centrifugation, the plasma was separated into tubes and frozen at −20°C for 4 days, followed by thawing and measurement of plasma urea by spectrophotometry. Samples were then again frozen at −20°C for 86 more days, when plasma urea was again evaluated. Values are expressed in mg/dL; (∗) statistically significant differences at P < 0.05.
