កម្រិត​ក្រេអាទីនីន​ borderline ចំពោះ​មនុស្ស​ធាត់​: អាន eGFR

តើលទ្ធផល creatinine ព្រំដែនមានន័យយ៉ាងណា?

Creatinine is the breakdown product of creatine and phosphocreatine in skeletal muscle. Most UK laboratories report approximately 60-110 µmol/L for adult men and 45-90 µmol/L for adult women, but the intervals vary by assay, age, and local population. A laboratory flag means the result differs from its reference group; it does not establish damage to the kidneys.

When I review a panel showing creatinine 118 µmol/L in a 29-year-old strength athlete, I first ask about body size, training in the previous 48 hours, supplements, fluid loss, medicines, blood pressure, and urinalysis. The result carries far more weight if it has risen from 82 to 118 µmol/L than if it has remained between 110 and 120 µmol/L for three years.

Dr. Thomas Klein has seen this distinction prevent a surprising amount of unnecessary alarm: a reference range is a population tool, while a personal baseline is a clinical tool. Our guide to out-of-range results explains why roughly 5% of healthy people fall outside a conventional reference interval by chance alone.

Creatinine is a concentration, not a direct clearance test

Serum creatinine rises when filtration falls, but it also rises when production increases or circulating volume contracts. A single concentration cannot separate these mechanisms; that is why clinicians interpret it beside eGFR, urine albumin, blood pressure, prior results, and the clinical story.

ហេតុ​អ្វី​បាន​ជា​ម៉ាស​សាច់ដុំ​ខ្ពស់​ធ្វើ​ឲ្យ eGFR មើល​ទៅ​ទាប?

The 2021 CKD-EPI creatinine equation uses serum creatinine, age, and sex; it does not measure lean mass, protein intake, or training volume. A 100 kg competitive lifter and a sedentary 100 kg adult can therefore receive the same eGFR adjustment despite very different daily creatinine production.

Baxmann and colleagues found that serum and urinary creatinine correlated with lean mass and physical activity, whereas cystatin C did not show the same relationship (Baxmann et al., 2008). That finding does not mean cystatin C is flawless, but it explains why I often use it as the tie-breaker in a visibly muscular patient.

កាន់តេស្ទី គឺជា ឧបករណ៍វិភាគឈាម AI that reads creatinine with age, sex, reported activity, medication context, and nearby kidney markers rather than treating one red flag as a verdict. For the biochemical distinction between urea and creatinine, see our BUN versus creatinine review.

តើ​អាហារ​បំប៉ន​គ្រី​អា​ទី​ន​អាច​បណ្ដាល​ឲ្យ​លទ្ធផល​គ្រី​អា​ទី​ន​ខ្ពស់​ដែរ​ឬ​ទេ?

The common misconception is that a higher creatinine after starting creatine proves the supplement harmed the kidneys. Creatinine is partly the end product of the supplemented molecule, so a modest shift can be analytical physiology rather than toxicity. Creatine ethyl ester may cause a larger apparent rise because it is less stable and can convert to creatinine before absorption.

I advise patients not to hide supplements from their clinician or laboratory form. Bring the tub or a photo of its ingredient list: some pre-workout products combine creatine with caffeine, stimulants, non-steroidal anti-inflammatory drugs, or poorly characterised additives, and those extra exposures may matter more than creatine itself.

A useful practical experiment is to repeat creatinine, cystatin C, urinalysis, and urine ACR after normal hydration and 48-72 hours away from maximal training; do not stop prescribed medicines without medical advice. Our supplement lab-tracking guide explains how to record a meaningful before-and-after comparison.

What supplementation cannot explain away

Creatine does not safely explain a new rising creatinine trend with albuminuria, blood in urine, high potassium, or hypertension. Those combinations require evaluation even in a heavily trained person, because athletic build and kidney disease can coexist.

តើ​ការ​ហាត់​ប្រាណ​ខ្លាំង​អាច​បង្កើន​គ្រី​អា​ទី​ន​បាន​យូរ​ប៉ុណ្ណា?

A 52-year-old recreational marathoner I reviewed had creatinine 132 µmol/L and CK 1,980 IU/L the morning after a hilly race; repeat testing after 5 quiet, well-hydrated days returned to creatinine 96 µmol/L. CK is a muscle-enzyme context clue, not a kidney test, and marked elevations deserve individual assessment.

Exercise-associated hemoconcentration can also make albumin, haemoglobin, calcium, and total protein look higher together. That clustered pattern is more suggestive of temporary fluid loss than isolated chronic kidney dysfunction; our article on ការកើនខ្ពស់ខុសដោយសារការខ្វះជាតិទឹក shows how to spot the pattern.

Avoiding exercise before a planned baseline draw is not cheating the test. For routine monitoring, I usually suggest no unusually strenuous session for 48 hours, eating normally, and arriving adequately hydrated unless the ordering clinician gives different instructions. See our more detailed exercise creatinine retest plan.

តើ​ពេល​ណា​ដែល eGFR ផ្អែក​លើ​គ្រី​អា​ទី​ន​មិន​គួរ​ឲ្យ​ជឿ​?

A cooked meat meal can cause a short-lived creatinine increase because dietary creatinine is absorbed; this is one reason some clinicians prefer a fasting or standardised morning retest. By contrast, very low muscle mass can produce a deceptively low creatinine and an eGFR that overstates filtration.

Pregnancy is its own exception: creatinine normally falls as filtration rises, so a result considered ordinary outside pregnancy may merit attention during pregnancy. The មគ្គុទេសក៍ pregnancy GFR covers why adult non-pregnant eGFR categories should not be applied casually in this setting.

The 2024 KDIGO guideline recommends using creatinine and cystatin C together when greater precision would affect a clinical decision (KDIGO, 2024). That applies to drug dosing, potential kidney donation, or a muscular adult with a persistent eGFR of 45-59 mL/min/1.73 m² and no other kidney-damage markers.

តើ​ពេល​ណា​ដែល Cystatin C ធ្វើ​ឲ្យ​គ្រី​អា​ទី​ន​ព្រំដែន​ច្បាស់​លាស់​?

Cystatin C is a small protein produced by most nucleated cells and filtered at the glomerulus. It is less influenced by muscle mass than creatinine, although smoking, obesity, thyroid dysfunction, systemic inflammation, and glucocorticoid use can affect it, so it is not a magic truth serum.

Inker et al. reported that the combined creatinine-cystatin C equation was more accurate than equations using either marker alone when compared with measured GFR (Inker et al., 2012). In practice, concordant eGFR values strengthen confidence; discordant values tell us to investigate why the markers disagree rather than simply choosing the more reassuring number.

Kantesti’s វេទិកាបកស្រាយការធ្វើតេស្តឈាម AI can identify a creatinine-cystatin C mismatch and prompt a clinician conversation about muscle mass, supplements, thyroid status, and medications. Readers can go deeper with our លទ្ធផល cystatin C.

ហេតុ​អ្វី​បាន​ជា urine ACR សំខាន់​ជាង​អ្វី​ដែល​មនុស្ស​ជា​ច្រើន​គិត?

Albuminuria changes the meaning of a borderline creatinine result. A muscular person with creatinine 120 µmol/L, stable eGFR 67 mL/min/1.73 m², normal blood pressure, negative urine dipstick, and ACR 0.6 mg/mmol has a very different risk profile from someone with ACR 12 mg/mmol.

Heavy exercise, fever, urinary infection, uncontrolled blood pressure, marked hyperglycaemia, and menstruation can transiently raise urine albumin. KDIGO recommends confirmation using a first-morning specimen where feasible, because an early sample reduces posture and exercise variability (KDIGO, 2024).

A dipstick is not a substitute for a quantitative ACR: it can miss moderately increased albumin excretion. Prepare properly with our ACR collection checklist, and review persistent bubbles separately in our guide to foamy urine causes.

តើ​អ្នក​គួរ​អាន​គ្រី​អា​ទី​ន​ជាមួយ​នឹង​អ្វី​ដែល​នៅ​សល់​នៃ​បន្ទះ​ដោយ​របៀប​ណា?

A high urea-to-creatinine ratio can occur with dehydration, gastrointestinal bleeding, high protein intake, or increased catabolism; it is not a clean kidney-damage score. Low bicarbonate, high potassium, and rising phosphate may support reduced kidney excretion when the pattern is persistent, but each has non-kidney causes too.

Urinalysis adds information that eGFR cannot provide. Protein, red cells, dysmorphic red cells, white cells, glucose, or casts can redirect the work-up toward glomerular disease, stones, infection, diabetes, or medication effects. Our urinalysis overview helps explain those findings without overcalling them.

កាន់តេស្ទី គឺជា ឧបករណ៍វិភាគតេស្តឈាមដោយ AI that compares kidney-related values across reports, because a change from eGFR 92 to 70 may be more relevant than an isolated value of 70. In our review workflow, trends are prompts for medical assessment, never a replacement for diagnosis.

A useful pattern to bring to an appointment

Bring at least two prior creatinine results, the laboratory units, dates, training or illness notes, a medication list, home blood-pressure readings, and any urine results. This small timeline often answers whether the value is stable, transient, or genuinely changing.

តើ​ពេល​ណា​ដែល​គ្រី​អា​ទី​ន​ព្រំដែន​ត្រូវ​បាន​ចាត់​ទុក​ថា​ជា​ជំងឺ​តម្រងនោម​រ៉ាំរ៉ៃ?

KDIGO classifies eGFR of 60-89 mL/min/1.73 m² as G2, but G2 alone is not CKD without evidence of kidney damage such as albuminuria, structural abnormalities, or persistent urine sediment changes. This nuance matters: an eGFR of 74 in a well, muscular adult can be normal variation.

An eGFR below 60 mL/min/1.73 m² on two measurements at least 90 days apart generally meets the filtration criterion for CKD, assuming acute causes have been excluded. The CKD staging explainer shows how eGFR and ACR categories work together rather than competing.

I am deliberately cautious here. Some people with early kidney disease have normal creatinine because they have low muscle mass, while some athletes have high creatinine and healthy kidneys; the laboratory value needs clinical context in both directions.

តើ​មនុស្ស​ពេញវ័យ​ដែល​មាន​សាច់ដុំ​គួរ​បារម្ភ​អំពី​គ្រី​អា​ទី​ន​នៅ​ពេល​ណា?

Seek same-day medical advice for markedly reduced urine output, new leg or facial swelling, breathlessness, confusion, persistent vomiting, or a creatinine increase of at least 26.5 µmol/L within 48 hours when known. Emergency assessment is particularly important after heat illness, severe diarrhoea, crush injury, or an extreme workout with dark cola-coloured urine.

Rhabdomyolysis is uncommon but relevant to the training community. Severe muscle pain, weakness, swelling, or dark urine after exertion alongside a high CK can require urgent testing for potassium, creatinine, calcium, phosphate, and urine findings; our CrossFit rhabdo warning guide covers the warning pattern.

Non-steroidal anti-inflammatory drugs, ACE inhibitors, ARBs, diuretics, trimethoprim, lithium, and some bodybuilding compounds can alter creatinine or renal haemodynamics. Never discontinue a prescribed medicine solely because an app or a single result looks concerning—ask the prescriber who knows why it was prescribed.

តើ​ផែនការ​ធ្វើ​តេ​ស្ត​ឡើងវិញ​ល្អ​បំផុត​សម្រាប់​អត្ត​ព​លិ​ក និង​អ្នក​លើក​ទម្ងន់​គឺជា​អ្វី?

For a borderline but non-urgent result, I commonly discuss a repeat creatinine with eGFR, cystatin C, urinalysis, urine ACR, electrolytes, and blood pressure within 1-4 weeks, tailored to the magnitude of change and risk factors. A person with diabetes, hypertension, known heart disease, or family kidney disease may need earlier review.

Do not deliberately overdrink water before testing. Excess fluid can lower creatinine concentration and sodium, creating a different misleading result; pale-yellow urine and ordinary thirst-guided intake are usually more useful than a heroic water challenge. Our អត្ថបទ​អំពី GFR ក្រោយ​ការ​ខ្សោះ​ជាតិ​ទឹក explains the opposite problem.

Record the last hard session, sauna exposure, diarrhoea, fever, fasting, new protein powder, creatine dose, and anti-inflammatory use next to the laboratory date. Kantesti’s trend tools are designed to preserve this context across reports, which makes a physician review more efficient.

តើ​ការ​ទទួលទាន​ប្រូតេអ៊ីន​ និង​អាហារ​សាច់​ប៉ះពាល់​ដល់​គ្រី​អា​ទី​ន​ដែរ​ឬ​ទេ?

Creatinine from cooked meat is absorbed and can increase a post-meal serum result for several hours. If a clinician is checking a borderline result, a morning draw after an ordinary overnight fast or a consistently documented meal pattern reduces this avoidable variation.

Protein intakes around 1.2-2.0 g/kg/day are commonly used by athletes, but kidney-diet advice should be individualised when CKD is confirmed. Cutting protein drastically before a test can obscure the real-world baseline and may be counterproductive for training or recovery.

Urea and creatinine answer different questions. For a technical explanation of their ratio and its limits, read our មគ្គុទេសក៍សមាមាត្រ BUN-creatinine; it is especially useful when a high-protein diet or dehydration complicates interpretation.

តើ​ថ្នាំ​ និង​លក្ខខណ្ឌ​អ្វីខ្លះ​ដែល​អាច​ធ្វើ​ពុត​ជា​បញ្ហា​តម្រងនោម?

ACE inhibitors and ARBs can cause a small early creatinine rise after initiation because they change pressure within the glomerulus; this effect can be acceptable or concerning depending on size, timing, potassium, volume status, and the reason for treatment. Prescribers usually recheck kidney function and potassium after starting or adjusting these medicines.

Thyroid disease can complicate both markers: hypothyroidism may raise creatinine, while thyroid status can also alter cystatin C. Severe infection, heart failure, obstruction from a stone or enlarged prostate, and autoimmune disease require their own targeted assessment rather than a generic 'kidney cleanse.'

Dr. Thomas Klein recommends a pharmacist-quality medication reconciliation at every unexplained creatinine change, including over-the-counter NSAIDs and herbal products. Our medication safety trend guide lists the result changes worth documenting.

ហេតុ​អ្វី​បាន​ជា Kantesti ដាក់​ព្រំដែន​គ្រី​អា​ទី​ន​ក្នុង​បរិបទ?

កាន់តេស្ទី គឺជា សេវាកម្មបកស្រាយការធ្វើតេស្តរបស់ AI lab built to translate laboratory language into structured questions for a clinician: Is this new? Was there hard training? Is urine ACR normal? Would cystatin C change a medication or referral decision? That is more useful than declaring a red flag benign or dangerous from one number.

Our platform supports PDF or photo report review and trend comparison in about 60 seconds, while privacy-focused handling and human clinical oversight remain part of the process. The methodology behind these safeguards is described in our ទិដ្ឋភាពទូទៅនៃការធ្វើឱ្យមានសុពលភាពផ្នែកវេជ្ជសាស្ត្រ.

If the pattern includes an abrupt creatinine rise, hyperkalaemia, substantial albuminuria, or concerning symptoms, the appropriate output is prompt medical care—not more self-testing. Readers who want to understand the clinical team behind this approach can review the ក្រុមប្រឹក្សាប្រឹក្សាវេជ្ជសាស្ត្រ.

តើ​អ្នក​គួរ​សួរ​គ្រូពេទ្យ​អំពី​លទ្ធផល​ព្រំដែន​នូវ​សំណួរ​អ្វីខ្លះ?

Ask whether the result meets an acute kidney injury criterion, whether it differs materially from your prior baseline, and whether there are urine, blood-pressure, or electrolyte abnormalities. Also ask whether the laboratory used the 2021 CKD-EPI equation and whether a combined creatinine-cystatin C eGFR would alter management.

As of September 9, 2026, the most defensible approach remains risk-based rather than physique-based: persistent eGFR below 60 mL/min/1.73 m², ACR at least 3 mg/mmol, or a clear upward creatinine trend deserves evaluation regardless of gym history. Conversely, stable mild elevation with normal cystatin C and ACR is often reassuring, though follow-up intervals should be personalised.

Keep your reports, training notes, and questions together. Our lab trend record guide is a practical template, and Kantesti’s មគ្គុទេសក៍បច្ចេកវិទ្យា AI explains how contextual interpretation is designed to support—not replace—clinical judgement.

សំណួរដែលសួរញឹកញាប់