Inclusion Criteria (ADPKD Subjects):
* ADPKD (based on Ravine et al. criteria)
* Class 1 B-E according to our imaging classification
* Male and female subjects 18 - 30 years of age, inclusive
* Estimated GFR\> 60 mL/min/m2 (CKD-EPI equation)
* Ability to provide written, informed consent.
Exclusion Criteria (ADPKD Subjects):
* Class 2 according to our imaging classification
* Concomitant systemic disease in the kidney (e.g. lupus, hepatitis B or C, amyloidosis)
* Diabetes mellitus (fasting glucose \> 126 mg/dL or treatment with insulin or oral hypoglycemics).
* Predicted urine protein excretion in urinalysis \>1 g/24 hrs
* Abnormal urinalysis suggestive of concomitant glomerular disease.
* Subjects having contraindications to, or interference with MRI assessments. \[For example: ferromagnetic metal prostheses, aneurysm clips, severe claustrophobia, large abdominal/back tattoos, etc\].
* Female subjects that are pregnant
Inclusion Criteria (Healthy Subjects):
* Male and female subjects 18 - 30 years of age, inclusive
* Estimated GFR\> 60 mL/min/m2 (CKD-EPI equation)
* Ability to provide written, informed consent.
Exclusion Criteria (Healthy Subjects):
* Previous personal or family history of kidney disease.
* Concomitant systemic disease in the kidney (e.g. lupus, hepatitis B or C, amyloidosis)
* Diabetes mellitus (fasting glucose \> 126 mg/dL or treatment with insulin or oral hypoglycemics).
* Presence of proteinuria
* Abnormal urinalysis suggestive glomerular disease.
* Subjects having contraindications to, or interference with MRI assessments. \[For example: ferromagnetic metal prostheses, aneurysm clips, severe claustrophobia, large abdominal/back tattoos, etc\]
* Female subjects that are pregnant
