BloodTestEasy

Creatinine 1.8 mg/dL

= 159.12 µmol/L in SI units

Men: High Women: High

Consider discussing this with your doctor in the coming weeks.

Men0.21.3257.410Women0.21.1257.4101.8
  • Low
  • Normal
  • Borderline high
  • High
  • Very high
  • Severely high
  • Critical high
Your band (men)
High · 1.5–2 mg/dL
Distance from typical range (men)
0.5 mg/dL above 1.3
Your band (women)
High · 1.3–2 mg/dL
Distance from typical range (women)
0.7 mg/dL above 1.1
SI units
1.8 mg/dL = 159.12 µmol/L

What 1.8 mg/dL means — men

A creatinine of 1.8 mg/dL is clearly above the typical adult male range and usually means the kidneys are filtering less efficiently than expected.

At this level most men have some genuine reduction in kidney filtration, although muscle mass and hydration still play a role. The elevation can come from chronic kidney disease, a medication effect, a urinary blockage, or a temporary insult such as dehydration during an illness. The single most important question is whether this is new: a rise from a previously normal baseline needs quicker attention than a stable, already-known value.

The typical adult male reference range is about 0.7 to 1.3 mg/dL (62 to 115 µmol/L), following the convention used by most US laboratories.

Common causes

  • Chronic kidney disease, most often from diabetes or high blood pressure
  • Acute kidney injury from dehydration, infection, or a drop in blood pressure
  • NSAID pain relievers such as ibuprofen or naproxen
  • Blood pressure medicines (ACE inhibitors, ARBs) or diuretics, especially when combined or when dehydrated
  • Urinary blockage, such as an enlarged prostate or kidney stones
  • Recent contrast dye from a CT scan or angiogram
  • Severe muscle injury (rhabdomyolysis)

Symptoms that can go with it

  • Often none at this stage
  • Fatigue or low energy
  • Swelling in the ankles or legs
  • Changes in how often you urinate, especially at night
  • Foamy urine
  • Rising blood pressure

Sensible next steps

  1. Arrange follow-up with your doctor soon — within the next couple of weeks, or within days if this is a new finding for you
  2. Dig out any older results so the trend is clear
  3. Hold off on NSAIDs (ibuprofen, naproxen) until a clinician has reviewed your kidneys
  4. Stay normally hydrated; don't force huge amounts of water
  5. Expect a repeat creatinine with eGFR and a urine albumin test, and possibly a kidney ultrasound
  6. Go through your full medication and supplement list with your doctor

What 1.8 mg/dL means — women

A creatinine of 1.8 mg/dL is distinctly above the typical adult female range and usually reflects genuinely reduced kidney filtration.

For most women, a value in this range means the kidneys are clearing waste more slowly than they should — muscle mass alone rarely pushes a woman's creatinine this high. Possible drivers include chronic kidney disease, medication effects, a urinary blockage, or an acute injury from dehydration or illness. Whether the number is newly elevated or long-stable changes how urgently it needs working up, so tracking down old results really helps.

The typical adult female reference range is about 0.6 to 1.1 mg/dL (53 to 97 µmol/L), the convention used by many US laboratories; some references cite slightly lower limits (for example, Mayo Clinic lists 0.59 to 1.04 mg/dL).

Common causes

  • Chronic kidney disease, commonly from diabetes or high blood pressure
  • Acute kidney injury from dehydration, infection, or low blood pressure
  • NSAID pain relievers such as ibuprofen or naproxen
  • ACE inhibitors, ARBs, or diuretics, particularly in combination or during illness
  • Urinary blockage from stones or pelvic conditions
  • Recent contrast dye from imaging
  • Autoimmune kidney disease, such as lupus nephritis
  • Severe muscle injury (rhabdomyolysis)

Symptoms that can go with it

  • Often none at this stage
  • Tiredness or low energy
  • Swelling in the ankles, legs, or around the eyes
  • Urinating more at night or less overall
  • Foamy urine
  • Rising blood pressure

Sensible next steps

  1. Book a follow-up with your doctor soon — within a couple of weeks, or within days if this is new for you
  2. Gather previous lab results to establish your trend
  3. Pause NSAIDs (ibuprofen, naproxen) until your kidneys have been reviewed
  4. If you are or might be pregnant, tell your clinician right away — this level needs prompt review in pregnancy
  5. Expect a repeat creatinine with eGFR, a urine albumin check, and possibly an ultrasound
  6. Walk through all medications and supplements with your doctor

Values rarely move alone

Creatinine and BUN are compared to each other; the pair, not either number alone, is what a doctor reads.

Or see the BUN scale first. · MedlinePlus — Creatinine Test

Frequently asked questions

Is 1.8 mg/dL a normal creatinine level?

No — 1.8 mg/dL is above the normal adult range (up to about 1.3 mg/dL for men and 1.1 mg/dL for women) and usually indicates the kidneys are filtering below par. It warrants follow-up with your doctor soon, especially if your previous results were normal.

What does a creatinine of 1.8 mean for my kidneys?

At 1.8 mg/dL, your kidneys are most likely filtering below normal capacity. That can be temporary (dehydration, medications) or chronic; comparing with old results and repeating the test tells the story.

Can drinking more water lower my creatinine?

A little, and only if you were dehydrated to begin with. Dehydration concentrates the blood and temporarily raises creatinine, so rehydrating can bring a mildly elevated value back to your true baseline. But water does not repair kidney function — if your creatinine stays high when you are well hydrated, the kidneys themselves need evaluating. Don't force extreme amounts of water; normal, steady hydration is the goal, and persistent elevations belong in a conversation with your doctor.

Why is the normal creatinine range different for men and women?

Creatinine is produced by muscle, and men on average carry more muscle mass than women, so men naturally make more of it. That is why US labs typically use about 0.7–1.3 mg/dL for men and 0.6–1.1 mg/dL for women. It also means the same number can carry different weight: a creatinine of 1.2 is unremarkable in most men but slightly above range for most women. The eGFR calculation builds in your sex and age to correct for this.

What is eGFR and why does it matter more than creatinine alone?

eGFR (estimated glomerular filtration rate) is a calculation that converts your creatinine, age, and sex into an estimate of how many milliliters of blood your kidneys filter per minute. It matters because the same creatinine means different things in different people — 1.3 mg/dL could be normal for a muscular 25-year-old man yet signal real disease in a slight 78-year-old woman. An eGFR of 90 or higher is generally normal; below 60 for three months or more defines chronic kidney disease. Ask your doctor to walk you through both numbers together.

Can creatine supplements or eating meat raise creatinine?

Yes, both can. Creatine supplements convert to creatinine and can nudge blood levels up without any harm to the kidneys, and a large serving of cooked meat within several hours of a blood draw does the same, because cooking converts the creatine in meat into creatinine. Intense workouts in the day or two before a test add to the effect. If a mildly high result might be explained this way, tell your doctor about your supplements and diet, and repeat the test after skipping creatine and heavy meat meals for a couple of days beforehand.

Check a different Creatinine value

Related values on your lab report

Sources

Educational information, not medical advice. Reference ranges vary between labs — always compare with the range printed on your own report and discuss results with your doctor. Full disclaimer