The LENT score is the sum of four components, giving a total from 0 to 7 points.

Component	Category	Points
Pleural fluid LDH (IU/L)	<1500	0
Pleural fluid LDH (IU/L)	≥1500	1
ECOG performance status	0	0
ECOG performance status	1	1
ECOG performance status	2	2
ECOG performance status	3–4	3
Serum neutrophil-to-lymphocyte ratio	<9	0
Serum neutrophil-to-lymphocyte ratio	≥9	1
Primary tumour type	Mesothelioma or haematological malignancy	0
Primary tumour type	Breast, gynaecological, renal cell carcinoma, or sarcoma	1
Primary tumour type	Lung cancer or any other tumour	2

Risk groups based on total LENT score:

LENT Prognostic Score for Malignant Pleural Effusion