Laboratory Medicine and Quality Assurance

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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
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