INR
red top
Blue test tubes are typically used for blood coagulation (BC) tests.
The tube color typically used for a prothrombin time (PT) blood test is a light blue-top tube containing sodium citrate as an anticoagulant.
A lavender or pink top tube is typically used for a PT (prothrombin time) test. This is the color used for collecting samples for coagulation studies.
A red-top tube is typically used for an Aspartate aminotransferase (AST) test, as it allows for serum collection and subsequent analysis.
A green or lavender top tube can be used for a uric acid test.
A light blue-top tube containing sodium citrate is typically used for a prothrombin time (PT) test, which is used to assess blood clotting function.
A royal blue-top or red-top tube is typically used for phenytoin testing. It is important to follow the specific instructions provided by the laboratory where the test will be performed.
blue top
Blue top tube which contains citrate.
pregnancy
Bromothymol blue is the pH indicator used in the citrate test. It turns blue at an alkaline pH, indicating that citrate has been utilized by the bacteria.