abnormal tubuloglomerular feedback response absent tubuloglomerular feedback response 2011-10-11T03:58:00Z MP:0011297 MPheno.ontology absence of the blood flow control mechanism that is operated in the juxtaglomerular apparatus of the kidney and involved in renal autoregulation by limiting changes in the glomerular filtration rate. TGF responds to changes in the concentration of NaCl in the tubular fluid at the level of the macula densa absent TGF response csmith