NIH launches major study to uncover hidden causes of dangerous low blood sugar
NCT ID NCT00001276
First seen Jun 27, 2026 · Last updated Sep 17, 2026 · Updated 18 times
Summary
This study aims to better understand why some people experience dangerously low blood sugar (hypoglycemia), especially after fasting. Researchers will admit 1,500 adults to the NIH Clinical Center for controlled fasting and a series of blood tests to measure insulin and other factors. The goal is to improve diagnosis and treatment for conditions like insulinoma, a tumor that causes excess insulin.
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Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 1,500 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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May 1991
- Lead sponsor
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A government research agency
The lead sponsor is the US National Institutes of Health.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
Who is studied
Patients how are referred to us that have fasting hypoglycemia due to diverse etiologies.@@@@@@
- Ages
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18 to 120 years
- Sex
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Anyone
- Healthy volunteers
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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 Hide 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: In order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. Male, females ages \>= 18. 2. Patients with documented fasting blood glucose below 55 mg/dl. 4\. Patients with biochemical evidence for insulinoma or other pancreatic neuroendocrine tumors. EXCLUSION CRITERIA: An individual who meets any of the following criteria will be excluded from participation in this study: 1. Patients with significant cardiac disease will be excluded. 2. Subjects who are pregnant per self-report. 3. Medically unstable per the assessment of the PI.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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
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National Institutes of Health Clinical Center
RECRUITINGBethesda, Maryland, 20892, United States
More trials for these conditions
Other studies related to the condition(s) this trial covers.
- Brain scans may predict who is most at risk for dangerous low blood sugar
- Tiny DNA fragments in blood could reveal how aggressive a pancreatic tumor will be
- Mapping the hormone behind Post-Surgery blood sugar crashes
- Hunting hidden pancreatic tumors: new tracer lights up insulinomas
- Can a radioactive tracer light up hidden tumors on scans?
- Can a new drug formulation shrink Hard-to-Treat neuroendocrine tumors?