Merck Manual

Please confirm that you are a health care professional

honeypot link

Renal Glucosuria

(Renal Glycosuria)


L. Aimee Hechanova

, MD, Texas Tech University Health Sciences Center, El Paso

Last full review/revision Jul 2020| Content last modified Jul 2020
Click here for Patient Education

Renal glucosuria is glucose in the urine without hyperglycemia; it results from either an acquired or an inherited, isolated defect in glucose transport or occurs with other renal tubule disorders.

Renal glucosuria is the excretion of glucose in the urine in the presence of normal plasma glucose levels.

Renal glucosuria can be inherited. This form usually involves a reduction in the glucose transport maximum (the maximum rate at which glucose can be resorbed) and subsequent escape of glucose in the urine. The inherited disorder is usually transmitted as an incompletely recessive trait (heterozygotes have modest glucosuria).

Renal glucosuria may occur without any other abnormalities of renal function or as part of a generalized defect in proximal tubule function (Fanconi syndrome). It also may occur with various systemic disorders, including cystinosis, Wilson disease, hereditary tyrosinemia, and oculocerebrorenal syndrome (Lowe syndrome).

Symptoms and Signs of Renal Glucosuria

Renal glucosuria is asymptomatic and without serious sequelae. However, if there is an associated generalized defect in proximal tubular function, symptoms and signs may include hypophosphatemic rickets, volume depletion, short stature, muscle hypotonia, and ocular changes of cataracts or glaucoma (oculocerebrorenal syndrome) or Kayser-Fleischer rings (Wilson disease). With such findings, transport defects other than glucosuria should be sought.

Diagnosis of Renal Glucosuria

  • Urinalysis

  • 24-h urine collection

The disorder is typically initially noted on routine urinalysis.

Diagnosis is based on finding glucose in a 24-h urine collection (when the diet contains 50% carbohydrate) in the absence of hyperglycemia (serum glucose < 140 mg/dL). To confirm that the excreted sugar is glucose and to exclude pentosuria, fructosuria, sucrosuria, maltosuria, galactosuria, and lactosuria, the glucose oxidase method should be used for all laboratory measurements. Some experts require a normal result on an oral glucose tolerance test for the diagnosis.

Treatment of Renal Glucosuria

  • No treatment needed

Isolated renal glucosuria is benign; no treatment is necessary.

Click here for Patient Education
NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version
Professionals also read

Test your knowledge

Testicular Torsion
Testicular torsion is a serious condition due to rotation of the testis and consequent strangulation of the blood supply. Torsion is most common in males between the ages of 12 and 18 years and is uncommon in men older than 30 years. When a patient presents with testicular torsion, which of the following is the most immediate symptom?
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Also of Interest