Laboratory Medicine and Quality Assurance

Fig. 1. Intralaboratory variations of the E gene cycle threshold (Ct) for mid-level positive (A, C) and low-level positive (B, D) samples. A and B show the results of the first challenge, and C and D show the results of the second challenge. The intralaboratory variation was calculated as the difference between the Ct values of the E gene target from the same sample in the same laboratory. The laboratories with false-negatives for each sample were excluded.

Lab Med Qual Assur 2023;45:166~172 https://doi.org/10.15263/jlmqa.2023.45.4.166