AKI

CKD

History suggestive of CKD

No

Yes

Kidney size

Normal

Small

Dynamics of serum creatinine increases

High

Low

CBC

Normal

Anemia

Calcium‑phosphate metabolism

Mild or moderate disturbances (depending on AKI etiology)

High phosphate level, increased alkaline phosphatase level, radiographic signs of renal osteodystrophy and/or soft tissue calcifications

Fundoscopy

Usually normal

Frequently lesions typical of diabetes mellitus or chronic hypertension