In thin basement membrane disease, the defect is in
High-Yield Explanation
TBM disease (also known as benign familial hematuria and thin basement membrane nephropathy) is, along with IgA nephropathy, the most common cause of blood in the urine without any other symptoms. The only abnormal finding in this diseaseis a thinning of the basement membrane of the glomeruli (filters) in the kidneys. Refer robbins 9/e