A Normal eGFR with Protein in the Urine
Kidney health is measured two ways, and a blood test only covers one of them. eGFR says how fast the kidneys filter. Albumin in the urine says whether the filter is leaking. A normal eGFR with protein leaking through is genuinely abnormal, it usually appears years before filtration falls, and it carries risk to the heart as well as the kidney.
The pattern on your report
- eGFR Normal Key
- Creatinine Normal Key
- Urine ACR High · mild Key
- HbA1c High-normal Supporting
Printed as: Creatinine in umol/Lor mg/dLeGFR in mL/min/1.73m2HbA1c in mmol/molor %— Not a simple multiplication: (mmol/mol divided by 10.929) plus 2.15.Urine ACR in mg/mmolor mg/g— Genuinely different figures: 3 mg/mmol is about 27 mg/g, and 30 mg/g is the equivalent US threshold. A result compared against the wrong notation is out by nearly a factor of nine.
Why the numbers look like this
The filtering unit is a mesh fine enough to hold albumin back while letting water and small waste through. Damage to that mesh lets albumin escape, and because the mesh has enormous spare capacity, the total filtration rate can stay entirely normal while a growing share of units leak.
That is why two measurements exist. Filtration is a capacity, and capacity is the last thing to fail. Leak is an integrity problem, and integrity fails first.
Albumin in the urine also reports on blood vessel lining more generally, and not only in the kidney, which is why it predicts cardiovascular events as well as kidney decline.
Not being flagged is not the same as normal
The test is a ratio, albumin against creatinine in the same urine sample, which removes the effect of how dilute the sample was. NICE puts the line for clinically important proteinuria at a confirmed 3 mg/mmol, asks for a second early morning sample anywhere between there and 70, and treats 70 or above as needing no repeat at all. A dipstick is not a substitute: it reports concentration, so it turns positive in a dehydrated sample and negative in a dilute one.
What else on the report can hide this
Blood pressure and HbA1c are the two that usually explain this and the two that change what happens next. Diabetes and hypertension account for most albuminuria, and in both, finding it early changes which drug is chosen, not merely how many.
Blood in the urine alongside protein moves the question elsewhere. That pairing points at the filter itself rather than at pressure or glucose, and it warrants a faster referral than protein alone.
One caution about the sample: exercise, fever, urinary infection and menstruation all raise urine albumin temporarily, so a single positive result taken after a hard run is not a finding. An early morning sample when well is what the confirmation is for.
What usually causes it
Listed from most to least common — not from most to least serious.
- Very common
Diabetes
The commonest cause worldwide. Albuminuria is often the first sign of kidney involvement and appears while filtration is still normal, which is exactly why it is screened for annually.
- Very common
High blood pressure
Sustained pressure damages the filter over years. Finding albuminuria changes which blood pressure drug is preferred, so it is not simply a marker.
- Common
A temporary rise
Vigorous exercise, fever, a urinary infection, heart failure or menstruation. Resolves, which is why confirmation on an early morning sample when well is part of the test.
- Common
Orthostatic proteinuria — in adolescents and young adults
Protein appears only after hours upright and is absent from an early-morning sample. Benign, and the morning repeat is what identifies it.
- Common
Obesity and metabolic syndrome
Raises filtration pressure within each unit. Often alongside a raised HbA1c and blood pressure, and it improves with weight loss.
- Uncommon
Glomerular disease
IgA nephropathy, membranous nephropathy and others. Blood alongside protein points here, and this group is where treatment is time-sensitive.
- Uncommon
Autoimmune disease
Lupus in particular. Joint pain, rashes or mouth ulcers, and a positive antinuclear antibody, point this way.
- Rare
Myeloma or amyloidosis
Suspected with a widened protein gap, raised calcium, anemia or bone pain. Light chains can be missed by an albumin-specific test, so total protein in the urine matters here.
What is usually checked next
- Repeat ACR on an early morning sample Confirms the finding and removes the temporary causes. NICE asks for this when the first result falls between 3 and 70 mg/mmol.
- Urine dipstick for blood, with microscopy if positive Blood with protein redirects toward the glomerulus and a faster pathway.
- Blood pressure, HbA1c and lipids Covers the two dominant causes and the cardiovascular risk that albuminuria itself signals.
- Kidney ultrasound Checks structure and size, and rules out obstruction or a structural cause.
- Urine total protein and serum electrophoresis where myeloma is possible An albumin-specific test can miss light chains, which is the way this cause gets overlooked.
When to seek care sooner
- Same day Blood and protein in the urine together
- Same day Swelling of the legs, face or around the eyes with frothy urine
- Same day Protein in the urine during pregnancy, especially with raised blood pressure, headache or swelling
- Soon An ACR of 70 mg/mmol or more
- Soon A rapidly rising ACR, or an eGFR that has started to fall
- Soon Joint pain, rash or mouth ulcers alongside
- Soon Bone pain with a raised calcium
Questions worth bringing to your appointment
- Was this an ACR on an early morning sample, or a dipstick?
- Does it need confirming on a second sample?
- Had I exercised, or had an infection, around the time it was taken?
- Does this change which blood pressure medicine I should be on?
- How often should it be repeated from here?