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Tiny study to reveal how phosphorus in food affects kidneys

NCT ID NCT06712719

Knowledge-focused Sponsor: University of Minnesota Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Sep 04, 2026 · Updated 3 times

Summary

This study looks at how the amount of phosphorus in food affects phosphorus and calcium balance in people with moderate chronic kidney disease (CKD). Fourteen participants will follow two different controlled diets (low phosphorus then high phosphorus, or vice versa) for 19 days each. Researchers will measure phosphorus and calcium in urine, stool, and blood to understand how the body handles these minerals. The goal is to gather knowledge, not to test a new treatment.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
controlled diets with low or high phosphorus content
What this could lead to
If successful, this could help doctors understand how to better manage phosphorus and calcium levels in people with moderate CKD through diet.
What could go wrong
This is a very small, early-stage study (14 people) focused on measuring body processes, not testing a treatment. Results may not apply to all CKD patients.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 14 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Oct 2026

An estimate. Start dates often move.

Expected to finish

May 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

30 to 75 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Men or women, ages 30-75 years old, any race or ethnicity * Moderate CKD, defined by KDIGO as eGFR category 3b (30-44 mL/min) or 4 (16-29 mL/min) with albuminuria categories A1-A3 * Serum intact parathyroid hormone above assay normal limit * Female subjects must be postmenopausal (\>12 months since last menstrual period), surgically sterile, or confirmed not pregnant by pregnancy test * Must be on stable doses of medications (except those noted in exclusion criteria) for at least 4 weeks prior to the study * Willing to discontinue supplements (e.g., vitamin D, calcium, multivitamin/minerals, or others) upon enrollment until completion of the study * Adequate vitamin D status defined as serum 25D \> 20 ng/mL based on National Academy of Medicine (then Institute of Medicine) criteria. Exclusion Criteria: * Plans to initiate dialysis within 6 months * Hypercalcemia defined as corrected serum calcium \>9.8 mg/dL within past 3 months * Hyperkalemia defined as serum potassium \>5.5 mg/dL within past 3 months * Hyperphosphatemia defined as serum phosphate \>5.5 mg/dL within past 3 months * Intestinal disease that alters absorption or normal intestinal function including celiac disease, small bowel resection, bariatric surgery, or chronic diarrhea/malabsorption * Serious, uncontrolled underlying systemic disease including diabetes, lupus, hypertension in the opinion of their physician * Pregnant or breastfeeding * Prescribed and taken a phosphate binder medication, calcitriol, vitamin D analogs, calcimimetics, PTH analogues, and other medications that may alter Ca and P metabolism within past 4 weeks * Non-English speaking

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Conditions

The condition(s) this trial relates to.

chronic kidney disease

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

CKD

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Indiana University School of Medicine

    Indianapolis, Indiana, 46202, United States

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Other studies related to the condition(s) this trial covers.