What are Kidneys Biomarkers?
Albumin (Microalbumin) – Urine
This test checks for tiny amounts of albumin (a type of protein) in your urine. Elevated levels can be an early sign of kidney damage, especially from high blood pressure or diabetes—often before standard kidney tests show problems.
Example: Microalbumin is like spotting a leak before the pipe bursts—it shows kidney stress early.
How it’s measured: Urine test measuring trace albumin levels.
Blood Urea Nitrogen (BUN)
BUN is a waste product that your kidneys usually remove. If levels rise, it may mean your kidneys aren’t filtering properly.
Example: BUN is like trash piling up—if it’s not being taken out, your system is backing up.
How it’s measured: Blood test measuring urea nitrogen in the bloodstream.
BUN / Creatinine Ratio
This ratio compares two kidney waste markers to give deeper insight into kidney health. High ratios may point to dehydration or GI bleeding; low ratios may signal kidney damage or liver issues.
Example: It’s like comparing two traffic reports—if one route is unusually backed up, something may be wrong upstream.
How it’s measured: Calculated automatically during blood tests if BUN is outside the normal range.
Calcium
Calcium helps with bones, nerves, and muscle function—but abnormal levels may reflect issues with the kidneys, which help regulate calcium balance.
Example: Calcium is like scaffolding for your body—too much or too little may mean deeper structural or filtration issues.
How it’s measured: Blood test measuring total calcium.
Chloride
Chloride is an essential mineral that keeps fluid and pH levels balanced. It also helps your kidneys function and detects issues like dehydration or heart failure.
Example: Chloride is like your body’s electrical wiring—if the balance is off, messages and fluid movement suffer.
How it’s measured: Blood test as part of an electrolyte panel.
Creatinine
Creatinine is a waste product from muscle use. Healthy kidneys remove it from your blood. Elevated levels often mean the kidneys aren’t doing their job.
Example: Creatinine is like exhaust from your muscles—if it’s not getting cleared out, your filter (kidneys) may be clogged.
How it’s measured: Blood test measuring creatinine concentration.
Estimated Glomerular Filtration Rate (eGFR)
eGFR shows how well your kidneys are filtering your blood. It’s a crucial test for detecting early kidney disease.
Example: eGFR is like measuring how fast your kidneys can clean a tank—slower speeds mean more waste is left behind.
How it’s measured: Calculated from your creatinine level, age, sex, and race using a blood test.
Potassium
Potassium is an electrolyte that supports muscle movement, nerve function, and fluid balance. Abnormal levels may point to kidney, heart, or adrenal issues.
Example: Potassium is like your body’s spark plug—too little or too much throws off your rhythm.
How it’s measured: Blood test as part of a basic metabolic panel.
Sodium
Sodium helps maintain fluid balance and nerve signals. Kidney issues can throw sodium off, affecting everything from blood pressure to brain function.
Example: Sodium is like your body’s water valve—too open or too closed causes system-wide problems.
How it’s measured: Blood test as part of an electrolyte or metabolic panel.
