Clinical Investigation

Kidney International (1987) 32, 896–899; doi:10.1038/ki.1987.292

Hyperglycemia with and without glycosuria: Effect on inulin and para-amino hippurate clearance

Stephen A Greene1, R Neil Dalton1, Charles Turner1, George B Haycock1 and Cyril Chantler1

1Evelina Children's Hospital and Unit of Metabolic Medicine, UMDS, Guys' Campus, London, United Kingdom

Correspondence: Dr S A Greene, University Department of Paediatrics, Guy's Tower (Floor 12), Guy's Hospital, London Bridge, London, UK SE1 9RT

Received 21 January 1987; Revised 16 July 1987.

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Abstract

Hyperglycemia with and without glycosuria on inulin and para-amino hippurate clearance. The response of the clearances of inulin (Cin) and para-amino hippurate (CPAH) to acute hyperglycemia with and without glycosuria was investigated in ten, healthy non-diabetic subjects. Standard methodology (UV/P) was used, with a mean clearance calculated from three, 15-minute urine collection periods. Each subject was studied at three levels of blood glucose (mmol/liter) concentration, mean (SE): Level 1, fasting, 4.5 (0.1); Level 2, hyperglycemia below renal threshold for glucose, 7.2 (0.1); Level 3, hyperglycemia with glycosuria, 12.6 (0.5). There was a significant rise in mean Cin (ml/min/1.73 m2) when changing from Level 1 (112 [3]) to Level 2 (121 [5]), with no further increase on changing to Level 3 (122 [4]). With glycosuria Cin fell in some subjects. Mean Cpah (ml/min/1.73 m2) increased through Level 1 (560 [27]) to Level 3 (603 [34]), with consequently no change in mean filtration fraction at the three levels of glycemia. Our observations show a rise in glomerular filtration rate with mild hyperglycemia below renal threshold, with no futher increase during hyperglycemia sufficient to produce glycosuria.

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