Question

Over or under filling a light blue top is a reason for a sample to be rejected by qns (quantity not sufficient). the ratio must be 7, not 7:1 or 10:1, but ____

A) 8:1
B) 9:1
C) 11:1
D) 12:1

Answer 1

The correct ratio of blood to sodium citrate in a light blue top tube for coagulation tests is 9:1. Deviating from this ratio results in sample rejection due to quantity not sufficient (QNS).

Step-by-step explanation:

The light blue top tube mentioned in the question is commonly used for coagulation tests in the medical field. These tubes contain sodium citrate, which acts as an anticoagulant. The correct ratio of blood to sodium citrate is critically important for accurate coagulation testing.

The ratio must be 9:1, which means for every 9 parts blood, there should be 1 part anticoagulant. An incorrect ratio could lead to inaccurate results, causing the sample to be rejected due to quantity not sufficient (QNS). Under or overfilling alters the blood to anticoagulant ratio and therefore is a reason for sample rejection.

The correct ratio of blood to sodium citrate in a light blue top tube for coagulation tests is 9:1.