Can a simple calcium tablet help prevent postpartum bleeding?

NCT ID NCT06650930

Completed Knowledge-focused Sponsor: Stanford University Source: ClinicalTrials.gov ↗

First seen Aug 12, 2026 · Last updated Aug 13, 2026 · Updated 1 time

Summary

This study looks at how quickly and effectively oral calcium is absorbed into the blood of pregnant women during labor. Participants receive a single dose of calcium carbonate (like Tums) or calcium citrate, and blood calcium levels are tracked over four hours. The goal is to understand whether oral calcium could be a practical way to raise blood calcium quickly, which might help prevent postpartum hemorrhage—excessive bleeding after delivery.

What this could mean

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

Active substance: oral calcium carbonate (and calcium citrate)
What this could lead to: If this works, it could guide the use of oral calcium to help prevent postpartum hemorrhage, a serious complication after childbirth.
What could go wrong: This is a very early, small study focused on how calcium is absorbed, not on whether it prevents bleeding. Results may not translate into clinical benefit.

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

Get updates

Get notified about this study

Sign up to get updates when this study changes or when new studies for PHARMACOKINETICS are added.

Our safety recommendation!

By submitting, you agree to our Terms of use

Conditions

The condition(s) this trial relates to.

Postpartum Hemorrhage

As listed by the trial registrant

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

PHARMACOKINETICS POSTPARTUM HEMORRHAGE PREGNANCY

Contacts and locations

Locations

Stanford Children's Health, Lucile Packard Children's Hospital

Stanford, California, 94305, United States

More trials for these conditions

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