Skip to main content

NLR and PLR as potential markers of disease activity in patients with ankylosing spondylitis?

Dear Editor,

We read the recently published article entitled ‘Neutrophil/lymphocyte and platelet/ lymphocyte ratios as potential markers of disease activity in patients with Ankylosing spondylitis: a case-control study’ by Al-Osami MH et al. [1] with interest. In the article authors aimed to evaluate the NLR and PLR as potential markers of disease activity in patients with ankylosing spondylitis. At the end of the article, the authors have pointed out that there was a statistically significant difference in the NLR and PLR between the active and inactive ankylosing spondylitis patients. And they concluded that PLR may be used as a useful marker in the assessment and monitoring of disease activity in AS together with acute phase reactants such as the ESR. The availability of this parameters at no additional cost may encourage its utilization in clinical practice. We would like to thank to the authors for their comprehensive contribution.

NLR is a globally available and inexpensive laboratory parameter, which is used to test systemic inflammation. In previous papers, it was shown that chronic hepatitis B and/or C infection, renal failure, diabetes mellitus, valvular heart diseases, acute coronary syndromes, thyroid functional abnormalities, metabolic syndrome, essential hypertension, and many inflammatory diseases may potentially affect the NLR [2, 3]. And also the main limitations of PLR studies are preanalytical faults, inadequate standardization of laboratory measurements, and inappropriate subject selection [4]. Thus, it would be more relevant if Al-Osami MH et al. had mentioned these NLR and PLR-affecting factors while evaluating the relationship between NLR and PLR in patients with ankylosing spondylitis. And also, as an important limitation of study, it would be more objective if a larger number of patients were included in this current research. Moreover, medication may easily alter NLR and PLR, so it would have been useful if the patients were described in greater detail in terms of, anti-inflammatory drugs, antiviral agents, immunosuppressive drugs, and/or other medications. In addition, it would also have been better if the authors indicated the elapsed time between taking the blood samples and measuring NLR and PLR, since waiting period prior to analysis may affect this laboratory parameters [2, 3].

We believe that the findings of Al-Osami MH et al. [1] will lead to further research concerning the relationship between NLR, PLR and ankylosing spondylitis. In addition to that, it should be kept in mind that NLR and PLR may not secure true information about disease activity in patients with ankylosing spondylitis.

Availability of data and materials

Not applicable.


  1. Al-Osami MH, Awadh NI, Khalid KB, Awadh AI. Neutrophil/lymphocyte and platelet/lymphocyte ratios as potential markers of disease activity in patients with ankylosing spondylitis: a case-control study. Adv Rheumatol. 2020;60(1):13.

    Article  Google Scholar 

  2. Düzenli T, Çakır Güney B, Tanoğlu A, Kaplan M, Akyol T. Does Gilbert syndrome have an effect on the hematologic parameters? GMJ. 2020;31(1):15–8.

    Article  Google Scholar 

  3. Karakonstantis S, Kalemaki D, Tzagkarakis E, Lydakis C. Pitfalls in studies of eosinopenia and neutrophil-to-lymphocyte count ratio. Infect Dis (Lond). 2018;50(3):163–74.

    Article  Google Scholar 

  4. Gasparyan AY, Ayvazyan L, Mukanova U, Yessirkepov M, Kitas GD. The platelet-to-lymphocyte ratio as an inflammatory marker in rheumatic diseases. Ann Lab Med. 2019;39(4):345–57.

    Article  Google Scholar 

Download references




There has been no financial support for this work.

Author information

Authors and Affiliations



TD and EA wrote and drafted the manuscript. The authors read and approved the final manuscript.

Corresponding author

Correspondence to Tolga Düzenli.

Ethics declarations

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Düzenli, T., Ata, E. NLR and PLR as potential markers of disease activity in patients with ankylosing spondylitis?. Adv Rheumatol 60, 24 (2020).

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: