An observational study in Healthy, sponsored by USDA Grand Forks Human Nutrition Research Center. Completed at 1 site in United States. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2018-07-02.
Sponsored by USDA Grand Forks Human Nutrition Research Center · Observational
This is an observation study of subjects who previously had iron-55 isotope administered in studies of iron absorption. By determining the retention of the isotope in blood during a 3-year period, body iron excretion can be measured.
One year following initial administration of iron-55 as a part of other related studies, subjects provide blood samples every 6 months for 3 years.
USDA Grand Forks Human Nutrition Research Center is the lead sponsor of 58 studies on the registry; 3 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Healthy adult men and women who previously participated in iron absorption studies using iron-55 isotope.
Exclusion Criteria:
Rate of Iron Excretion.
Iron excretion calculated as body Fe (mg) times turnover rate estimated from blood activity of Fe55
Time frame: 4 years
Participants were invited to join the study if they had participated in a study involving consumption of Iron-55 at least one year earlier at Grand Forks Human Nutrition Research Center
| Milestone | Male Subjects Having Consumed Iron-55 Tracer | Menstruating Women Having Consumed Iron-55 Tracer | Postmenopausal Women Having Consumed Iron-55 Tracer |
|---|---|---|---|
| Started | 38 | 30 | 9 |
| Completed | 29 | 19 | 5 |
| Not completed | 9 | 11 | 4 |
| Withdrew: Withdrawal by subject | 9 | 11 | 4 |
Iron excretion calculated as body Fe (mg) times turnover rate estimated from blood activity of Fe55
| milligrams per day | Male Subjects Having Consumed Iron-55 Tracer | Menstruating Women Having Consumed Iron-55 Tracer | Postmenopausal Women Having Consumed Iron-55 Tracer |
|---|---|---|---|
| Rate of Iron Excretion. | 1.07 (0.89 to 1.25) | 1.69 (1.30 to 2.20) | 1.08 (0.73 to 1.43) |
Non-serious events are listed at a 1% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Male Subjects Having Consumed Iron-55 Tracer | — | 0/29 (0%) | 0/29 (0%) |
| Menstruating Women Having Consumed Iron-55 Tracer | — | 0/19 (0%) | 0/19 (0%) |
| Postmenopausal Women Having Consumed Iron-55 Tracer | — | 0/5 (0%) | 0/5 (0%) |
| Age, Continuous(years) | Male Subjects Having Consumed Iron-55 Tracer | Menstruating Women Having Consumed Iron-55 Tracer | Postmenopausal Women Having Consumed Iron-55 Tracer | Total |
|---|---|---|---|---|
| Mean | 43 ± 8 | 40 ± 5 | 50 ± 5 | 43 ± 7 |
| Sex: Female, Male(Participants) | Male Subjects Having Consumed Iron-55 Tracer | Menstruating Women Having Consumed Iron-55 Tracer | Postmenopausal Women Having Consumed Iron-55 Tracer | Total |
|---|---|---|---|---|
| Female | 0 | 30 | 9 | 39 |
| Male | 38 | 0 | 0 | 38 |
This study is completed, as verified in May 2018. You cannot join it, but the record below documents what was studied.
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USDA Grand Forks Human Nutrition Research Center