AJLM African Journal of Laboratory Medicine 2225-2002 2225-2010 AOSIS AJLM-12-1996 10.4102/ajlm.v12i1.1996 Correction Corrigendum: The application of sigma metrics in the laboratory to assess quality control processes in South Africa https://orcid.org/0000-0002-5086-8903 van Heerden Marli 1 2 https://orcid.org/0000-0002-8741-8746 George Jaya A. 1 2 https://orcid.org/0000-0001-8068-7460 Khoza Siyabonga 1 2 National Health Laboratory Service, Johannesburg, South Africa Faculty of Health Sciences, Charlotte Maxeke Johannesburg Academic Hospital, University of the Witwatersrand, Johannesburg, South Africa Corresponding author: Marli van Heerden, marli.vanheerden@nhls.ac.za 15052023 2023 12 1 1996 © 2023. The Authors 2023 Licensee: AOSIS. This work is licensed under the Creative Commons Attribution License.

In the published article, Van Heerden M, George JA, Khoza S. The application of sigma metrics in the laboratory to assess quality control processes in South Africa. Afr J Lab Med. 2022;11(1):a1344. https://doi.org/10.4102/ajlm.v11i1.1344, there was an error. The incorrect Sigma metric calculation was stated.

The correction has now been made on page 2 in the Methods section, under Data collection and analysis, paragraph 4 and should read:

The original paragraph:

Sigma metrics were calculated for each analyte on two levels as follows: Sigma = TEa−(bias/standard deviation).

The revised and updated paragraph:

Sigma metrics were calculated for each analyte on two levels as follows: Sigma = (TEa−bias)/standard deviation.

The authors apologise for this error. The correction does not change the study’s findings of significance or overall interpretation of the study’s results or the scientific conclusions of the article in any way.

How to cite this correction: Van Heerden M, George JA, Khoza S. Corrigendum: The application of sigma metrics in the laboratory to assess quality control processes in South Africa. Afr J Lab Med. 2023;12(1), a1996. https://doi.org/10.4102/ajlm.v12i1.1996

Note: DOI of original article published: https://doi.org/10.4102/ajlm.v11i1.1344