Relationship between Neutrophil-to-Lymphocyte Ratio and Inflammatory Markers in Sickle Cell Anaemia Patients with Proteinuria

The renal functions and structure in sickle cell anaemia (SCA) patients may be affected by chronic haemodynamic changes and consequences of vaso-occlusive events in the renal medulla. Few reports on neutrophil-to-lymphocyte (NLR) and platelet-to-lymphocyte (PLR) ratios in SCA patients in Africans exist in the literature. This study correlates the values of NLR and PLR with measured traditional inflammatory markers in SCA patients with and without proteinuria and impaired kidney function (defined in this study as estimated glomerular filtration rate (eGFR), less than 60 mL/min/1.73 m². Full blood count, C-reactive protein (CRP), and fibrinogen were assayed in 150 SCA patients and 50 control subjects using Coulter Haematology analyser (CELL DYE 37000) and ELISA method, respectively. The NLR and PLR were calculated by dividing absolute neutrophil or platelet counts by absolute lymphocyte count. Fibrinogen, CRP, NLR, and PLR increased progressively (p < 0.001) in SCA patients with or without proteinuria, with the highest values seen in those with impaired renal function. NLR correlated positively with CRP and fibrinogen in SCA patients without proteinuria (p < 0.001), with proteinuria (p < 0.001), and impaired renal function (p < 0.05). A positive relationship was also observed between NLR and fibrinogen in the control subjects. The need to determine cut-off values for these leukocyte ratios to be used in identifying those patients at risk and in the general management of SCA patients is suggested.