Calcium with Creatinine, Urine
Flags excess urinary calcium, a leading driver of kidney stones and a clue to calcium metabolism disorders.
Consider this test if:
- A history of kidney stones, or recurrent stones you want to understand
- Elevated blood calcium or known parathyroid or thyroid issues being worked up
- Tracking urinary calcium while on calcium or vitamin D supplements
- Investigating bone disease such as osteomalacia or Paget disease
- Checking how a thiazide or loop diuretic is affecting calcium handling
- HSA/FSA eligible
- Results delivered to your dashboard · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
No fasting required. A random urine sample is sufficient for screening, though results reflect recent diet, so a calcium-heavy meal or supplement beforehand can raise the value. Calcium supplements and loop diuretics increase urinary calcium, while thiazide diuretics lower it; note any of these. If a 24-hour collection is recommended for fuller evaluation, follow the timed-collection instructions instead.
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What this test is for
This test measures calcium in a random urine sample and divides it by creatinine to correct for how dilute or concentrated the sample is, reported as a calcium-to-creatinine ratio. Urine is the body's main route for eliminating calcium, so high excretion (hypercalciuria) is one of the established risk factors for kidney stones and can point to hyperparathyroidism, vitamin D excess, sarcoidosis, Paget disease, or bone-destroying conditions. Low urinary calcium shows up with hypoparathyroidism, vitamin D deficiency, osteomalacia, or familial hypocalciuric hypercalcemia. The creatinine here is a normalizing reference, not a kidney-function measure; for that use the dedicated creatinine or ACR tests. A random sample is a practical screen, but a 24-hour urine collection is preferred when calcium excretion is being formally evaluated.
Biomarkers tested
Includes 3 biomarkers
- Specimen
- Urine
- Measures
- Mass concentration
- Specimen
- Urine
- Measures
- Ratio
Urine creatinine tracks a waste product muscle breaks down at a steady rate, which makes it the reference point for judging whether a urine sample is concentrated or diluted. Labs use it to normalize other urine markers, most importantly albumin, into a ratio (ACR) that actually reflects kidney filtering rather than how much water you drank that morning. On its own it is rarely the number you care about, but pair it with albumin and it becomes one of the earliest ways to catch kidney strain from diabetes, high blood pressure, or high-protein training loads before symptoms show up.
- Specimen
- Urine
- Measures
- Mass concentration
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Fast, dashboard-delivered results
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
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Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost — covering the lab and what it takes to run the service — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
Where do I get tested?
Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.
Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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