Which of the following is a reason for a sample to be rejected by QNS?

• A. Insufficient volume of blood
• B. Incorrect labeling
• C. Light blue with a 7:1 ratio
• D. Expired collection tube

Answer: (A)

Quantity not sufficient means there isn’t enough blood to perform the requested tests reliably. When a sample is rejected for QNS, the lab cannot run all the required assays with the available volume, which could lead to inaccurate results or the need to redraw. This issue is specifically about not having enough specimen, not about labeling, tube ratio, or tube expiration—those are separate problems that would cause different types of rejection. In practice, a QNS rejection occurs when the collected volume falls below the lab’s minimum for the test panel, so the fix is to collect an adequate amount of blood (and, if multiple tests are ordered, ensure the total volume meets requirements).