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Also reported in: mg/dL
A normal Cystatin C indicates that kidney filtration is within the expected population range. While not in the optimal low zone, this level does not suggest significant kidney impairment. Cystatin C is particularly useful when creatinine gives ambiguous results due to body composition differences.
Cystatin C is a small protein produced at a constant rate by all cells in the body and filtered out exclusively by the kidneys. A very low Cystatin C indicates exceptional kidney filtration ability. Unlike creatinine, Cystatin C is not noticeably affected by muscle mass, making it a more reliable independent marker of kidney function.
Excellent kidney marker. Very low Cystatin C reflects healthy, efficient kidney filtration. No action needed.
Cystatin C: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})A low Cystatin C within the optimal range indicates strong kidney filtration function. Because this marker is produced at a constant rate regardless of diet or muscle mass, it is especially reliable for assessing true kidney filtration. Low levels are consistently associated with better kidney function and lower cardiovascular risk.
Great result. Low Cystatin C is a very good kidney health sign. Continue regular kidney function monitoring.
Cystatin C: {{value}} {{unit}} — low (ref: {{low}}–{{high}}; optimal: 0.52–0.90)A borderline low Cystatin C is entirely within the healthy range and indicates good kidney filtration. At this level, the kidneys are efficiently clearing this protein marker from the blood. There is no sign of impaired filtration, and this result is reassuring for kidney health.
Good result. No action needed from a kidney function perspective.
Cystatin C: {{value}} {{unit}} — low normal (ref: {{low}}–{{high}})A normal Cystatin C indicates that kidney filtration is within the expected population range. While not in the optimal low zone, this level does not suggest significant kidney impairment. Cystatin C is particularly useful when creatinine gives ambiguous results due to body composition differences.
Normal result. Maintain hydration and kidney-healthy lifestyle. Annual kidney function checks are appropriate.
Cystatin C: {{value}} {{unit}} — normal (ref: {{low}}–{{high}})An optimal Cystatin C below 0.90 mg/L provides strong confirmation of healthy kidney filtration function. Cystatin C is increasingly preferred over creatinine because it is not influenced by diet, hydration status, or muscle mass, making it a more precise reflection of actual glomerular filtration. Optimal levels correlate with lower cardiovascular risk too.
Excellent kidney marker result. Keep kidneys healthy with adequate hydration and avoid long-term NSAID use.
Cystatin C: {{value}} {{unit}} — optimal (ref: 0.52–0.90)A borderline elevated Cystatin C suggests that kidney filtration is beginning to operate slightly below optimal capacity. Because this marker is not affected by muscle mass or diet, a borderline elevation is a more specific signal of early kidney function decline than borderline creatinine elevation. Repeat testing and eGFR (a number that shows how well your kidneys filter your blood) assessment are warranted.
Discuss with your doctor. Repeat testing and full kidney function panel including eGFR (a number that shows how well your kidneys filter your blood) and urine albumin are recommended to determine if early CKD is present.
Cystatin C: {{value}} {{unit}} — borderline elevated (ref: {{low}}–{{high}}; borderline: 0.90–1.20)An elevated Cystatin C above 1.20 mg/L is a reliable indicator of meaningful kidney filtration impairment. Because this marker is not influenced by body composition, an elevated Cystatin C often reveals kidney dysfunction that standard creatinine measurements may miss in people with low muscle mass. This level warrants formal CKD staging.
See your doctor. Full kidney function assessment including formal GFR calculation, urine albumin, and possibly kidney imaging is needed to stage and manage the impairment.
Cystatin C: {{value}} {{unit}} — elevated — kidney function reduced (ref: {{low}}–{{high}}; elevated: >1.20)A very high Cystatin C above 3.0 mg/L indicates noticeable kidney failure with noticeably reduced filtration. At this level, the kidneys are failing to clear even this freely filtered protein, and toxic waste products are accumulating in the blood. This level requires urgent intervention and is consistent with advanced CKD or acute kidney injury.
Seek emergency medical care. Very high Cystatin C requires urgent nephrology evaluation and possible dialysis consideration.
Cystatin C: {{value}} {{unit}} — very high (ref: {{low}}–{{high}}; critical: >3.0)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.