CI	Confidence interval
CKD	Chronic kidney disease
ECL	Electrochemiluminescence
eGFR	Estimated glomerular filtration rate
ESS	Euthyroid sick syndrome
GFR	Glomerular filtration rate
GLMM	Generalized linear mixed model
HD	Hemodialysis
IRMA	Immunoradiometric assay
JBI	Joanna Briggs Institute
KRT	Kidney replacement therapy
NR	Not recoverable
NTI	Non-thyroidal illness
PD	Peritoneal dialysis
PI	Prediction interval
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PROSPERO	International Prospective Register of Systematic Reviews
RIA	Radioimmunoassay
REML	Restricted maximum likelihood
SCH	Subclinical hypothyroidism
T3	Triiodothyronine
T4	Thyroxine
TSH	Thyroid-stimulating hormone