Creatinine: what your level actually means
Also known as: Serum Creatinine, Cr · Updated 19 Aug 2026 · Educational — not medical advice
The short answer: Creatinine is a muscle waste product your kidneys filter out — so it's the standard quick check of kidney function. Roughly 0.6–1.2 mg/dL is normal; muscular people run naturally higher, and the trend matters more than one value.
Where does your value sit?
mg/dL
Normal0.2Normal 0.6–1.2 mg/dL3+
This Creatinine value is inside the normal range. Your lab's printed reference range takes precedence — ranges vary slightly between laboratories.
Convert Creatinine: mg/dL ↔ µmol/L
=
Labs report Creatinine in either unit — same value, different scale. Type in either box.
What Creatinine tells you
Kidneys
Because muscles produce creatinine at a steady rate, a rising blood level means the kidneys are clearing less of it. Labs often pair it with eGFR, which converts creatinine into an estimated filtration rate. (Illustration is schematic.)
Common reasons it rises
- Reduced kidney filtration — many possible causes, needs medical review
- Dehydration at the time of the test
- High muscle mass or creatine supplements
- Some medicines and painkillers
And reasons it runs low
- Low muscle mass
Could a medicine be moving this number?
These medicines are known to shift Creatinine. Seeing one you take does not mean it is the cause, and it is never a reason to stop on your own — it is a reason to ask whether your result needs reading in that light.
- Aciclovir · Antiviral (nucleoside analogue)The drug can crystallize in the kidneys if fluid intake is low, and a rising creatinine is often the first sign, which is why staying well hydrated during treatment matters.
- Apixaban · Direct oral anticoagulant (factor Xa inhibitor, blood thinner)Because part of the drug is cleared through the kidneys, creatinine and kidney function are checked to help confirm the dose remains appropriate.
- Atenolol · Beta-blocker (cardioselective beta-1 blocker)Because atenolol is cleared mainly through the kidneys, creatinine is checked to judge how well the kidneys are handling elimination of the medicine.
- Cefixime · Third-generation oral cephalosporin antibioticSince this medicine is cleared through the kidneys, reduced kidney function can affect how it's dosed, and creatinine is sometimes checked beforehand in people with known kidney concerns.
- Cetirizine · Second-generation antihistamineSince cetirizine relies heavily on the kidneys for elimination, monitoring creatinine can help gauge how efficiently it's being cleared, particularly with long-term or high-dose use.
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- Ciprofloxacin · Fluoroquinolone antibioticRarely, this antibiotic can trigger a kidney reaction that shows up as a rising creatinine, so kidney function is sometimes rechecked if it's used for more than a short course.
- Colchicine · Anti-inflammatory alkaloid used for gout and certain inflammatory conditionsReduced kidney function slows clearance of this medicine, raising the risk of toxicity, so creatinine and eGFR guide how it's used in people with kidney impairment.
- Cotrimoxazole · Combination sulfonamide antibacterial (trimethoprim plus sulfamethoxazole)Creatinine readings can rise somewhat, partly because the medicine blocks a kidney transport step rather than truly reducing filtering, though true kidney effects can also occur.
- Dabigatran · Anticoagulant (direct thrombin inhibitor)This medicine is cleared mainly through the kidneys, so creatinine is checked before starting and periodically during treatment to guide safe dosing.
- Dapagliflozin · SGLT2 inhibitor for type 2 diabetes, heart failure, and chronic kidney diseaseCreatinine can rise slightly and eGFR can dip in the first weeks after starting, reflecting a change in how the kidney filters, which usually settles rather than signaling ongoing kidney injury.
- Diclofenac · NSAID (nonsteroidal anti-inflammatory pain reliever)By reducing blood flow through the kidneys, this medicine can push creatinine upward, especially with frequent use, dehydration, or existing kidney concerns.
- Digoxin · Cardiac glycosideThis medicine is cleared largely through the kidneys, so creatinine is checked to guide safe dosing.
- Dolutegravir · Antiretroviral (HIV integrase strand transfer inhibitor)This medicine can cause a modest, expected rise in creatinine by affecting how the kidneys handle it, without this reflecting true kidney damage; a prescriber interprets this in context.
- Empagliflozin · SGLT2 inhibitor (oral diabetes medicine)Creatinine can rise a little in the first weeks as the kidneys adjust to changed filtering pressure, then typically settles; this initial shift is generally considered an expected part of how the drug protects the kidneys long-term rather than a sign of harm.
- Ethambutol · Antibiotic used specifically against tuberculosisThis medicine is cleared through the kidneys, so kidney function is checked before starting to guide appropriate dosing.
- Famotidine · H2-receptor blocker (acid-reducing medicine)Because this medicine is cleared mainly through the kidneys, a rising creatinine matters for how it's used, and kidney function often shapes how it's adjusted in older adults.
- Fenofibrate · Fibrate for high triglyceridesA mild, usually reversible rise in creatinine is common and is distinguished from true kidney injury through follow-up testing rather than assumed to mean harm.
- Furosemide · Loop diureticIf fluid loss outpaces intake, blood flow to the kidneys can drop temporarily and creatinine can rise, which is why kidney function is tracked alongside diuretic use.
- Gabapentin · Anticonvulsant used for nerve pain (gabapentinoid)Since this medicine is cleared almost entirely through the kidneys, the amount used depends heavily on kidney function, and a rising creatinine usually prompts a review of how it's being used.
- Hydralazine · Direct-acting arterial vasodilatorKidney function is checked periodically as part of routine monitoring for people on long-term blood pressure treatment.
- Hyoscine Butylbromide · Antispasmodic (anticholinergic)This medicine is poorly absorbed from the gut and largely stays out of general circulation, so routine blood test monitoring is not typically required for short-term use in people with normal kidney function.
- Ibuprofen · NSAID (nonsteroidal anti-inflammatory pain reliever)Ibuprofen can reduce blood flow through the kidneys, so a rising creatinine can signal the kidneys are working harder than usual, especially with frequent use, dehydration, or existing kidney concerns.
- Latanoprost Eye Drops · Prostaglandin analog eye dropRoutine blood tests are not typically needed to monitor this eye drop, since properly applied drops lead to only minimal absorption into the bloodstream.
- Levocetirizine · Second-generation (non-drowsy) antihistamineReduced kidney function slows clearance of this medicine, so dosing is often adjusted based on kidney function tests in people with significant impairment.
- Losartan · ARB, angiotensin receptor blocker (blood pressure medicine)Creatinine is tracked as a marker of kidney filtering function, since losartan changes the pressure inside the kidney's blood vessels in a way that's usually protective but occasionally needs monitoring.
- Mesalamine · Aminosalicylate (gut-targeted anti-inflammatory)Mesalamine has been linked to rare kidney effects, so creatinine is checked periodically, particularly before starting and during longer-term treatment.
- Methotrexate · Disease-modifying antirheumatic drug (DMARD) and antifolate agentKidney function is checked before starting and periodically afterward, since reduced clearance allows the medicine to build up to toxic levels in the blood.
- Mupirocin Ointment · Topical antibiotic ointmentThis ointment's inactive base ingredient can be absorbed through large open wounds; in people with significant kidney impairment being treated over extensive wound areas, kidney function is sometimes considered when deciding on treatment duration.
- Naproxen · NSAID (nonsteroidal anti-inflammatory pain reliever)Reduced blood flow through the kidneys from regular use can raise creatinine, particularly alongside dehydration or existing kidney issues.
- Ofloxacin Ear Drops · Fluoroquinolone antibiotic ear dropRoutine blood tests are not typically needed to monitor this ear drop, since correctly applied drops lead to only minimal absorption into the bloodstream compared with oral or injectable antibiotics of this class.
- Pregabalin · Anticonvulsant used for nerve pain (gabapentinoid)Like gabapentin, this medicine is cleared through the kidneys, so a rising creatinine typically prompts a reassessment of how it's being used.
- Ramipril · ACE inhibitor (angiotensin-converting enzyme inhibitor)Creatinine can rise slightly when treatment starts as blood flow through the kidney's filtering units adjusts, which is why kidney function is usually rechecked after beginning or adjusting this medicine.
- Rosuvastatin · Statin (cholesterol-lowering medicine)At higher doses, rosuvastatin can occasionally cause temporary protein traces in urine tests; doctors sometimes review kidney results alongside it, which is routine caution rather than alarm.
- Sacubitril/Valsartan · Angiotensin receptor-neprilysin inhibitor (ARNI)Kidney function is monitored, since this medicine's effect on blood vessels and fluid balance can influence creatinine levels.
- Shilajit · Herbal/mineral supplement (traditional mineral-resin tonic)Heavy-metal contamination documented in unpurified products can affect kidney function over time, making creatinine a relevant marker to watch with long-term use.
- Tacrolimus Ointment · Topical calcineurin inhibitorUnlike the oral form of this medicine used after organ transplants, topical application leads to only minimal absorption into the bloodstream, so routine kidney monitoring is not typically required unless it is applied over very large areas of broken or raw skin.
- Telmisartan · ARB, angiotensin receptor blocker (blood pressure medicine)Creatinine is checked because telmisartan changes blood flow inside the kidneys' filtering units, and a rise can signal the kidneys need a closer look.
- Tenofovir Disoproxil Fumarate · Antiretroviral / antiviral (nucleotide reverse transcriptase inhibitor)Kidney function is checked before starting and periodically afterward, since this medicine is cleared through the kidneys and can affect creatinine over time.
- Valacyclovir · Antiviral (nucleoside analogue, prodrug of acyclovir)This medicine is cleared through the kidneys and can occasionally raise creatinine, particularly if the body is dehydrated, so levels may be checked before and during higher-dose courses.
Never stop or change a prescribed medicine because of a lab result. Take the result and your medicine list to whoever prescribed it.
What should I eat?
Eat freely
- water through the day — good hydration helps kidneys clear waste normally
- dal and other plant proteins — gentler on kidneys than very high meat intake
- seasonal fruit and vegetables — fibre and vitamins; ask your doctor if potassium is restricted
- idli, dosa or poha — easy, moderate-protein options for regular meals
- curd or buttermilk — light protein that is easy on digestion
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- fish or chicken in modest portions — lean protein without excess if portions stay sensible
Go easy on
- red meat and organ meats — heavier protein load can add strain on the kidneys
- protein supplements and shakes — concentrated protein can raise the load on kidneys
- extra table salt — less salt helps control blood pressure, which protects kidneys
Best avoided
- creatine supplements — creatine supplements directly raise creatinine and strain kidneys
- painkillers like ibuprofen without a doctor's advice — NSAIDs can reduce blood flow to the kidneys
One realistic day
- Morning1 glass of water, then tea or coffee in moderation
- BreakfastPoha or idli with a small bowl of curd
- Lunch2 rotis, 1 katori dal, sabzi and salad
- EveningA handful of fruit or roasted chana
- Dinner1 katori dal or fish, rice, and cooked vegetables
Can I exercise?
Stop and get help if
- Chest pain or severe breathlessness
- Fainting or severe dizziness
- Swelling in the legs, ankles or face
- Little or no urine output
Most people with mildly raised creatinine can stay active; check with your doctor if kidney disease is suspected.
Your week
- 5 days: a 30-minute brisk walk
- 2 days: light strength work with body weight
- Daily: gentle stretching or yoga
- 1-2 rest days each week
Start here: Start with a comfortable 10-minute walk and build up slowly
Skip for now
- Very high-protein diets paired with intense strength training
- Exercising in the heat without enough water
Check with your doctor first: Anyone with known kidney disease, high blood pressure, diabetes, or on regular painkillers should check with their doctor before changing diet or exercise.
General guidance for adults — not a personal diet plan. Your doctor or dietitian knows your full picture.
Checked against: Creatinine Test - MedlinePlus · Kidney disease - NHS · Creatinine - National Kidney Foundation (NKF)
What to do next
1
Ask your doctor: “What is my eGFR, and what does it say about kidney function?”
2
Ask your doctor: “Could dehydration or supplements explain this reading?”
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Questions people ask
I lift weights and take creatine — is my high creatinine a problem?
Possibly not: muscle mass and creatine supplements both raise creatinine without kidney trouble. Tell your doctor — they may check cystatin C or eGFR trends instead.
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