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Most pregnancies after living kidney donation are uncomplicated, study finds (opens in a new tab)

medicalxpress.com · 2026-10-26

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Mixed

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The claims we could check match the study, but some claims were not covered by the evidence reviewed.

3 supported
2 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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The story

Most pregnancies after living kidney donation are uncomplicated, study finds

medicalxpress.com · 2026-10-26

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Every claim we could check holds up. Three of five claims match the study. This overall rating is based only on the claims we could check. Two claims the study doesn't address.

3 supported
2 not covered

Open claim evidence

The source study

Pregnancy Outcomes After Living Kidney Donation

JAMA · 2026

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5 claims in this story

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Claim 1 of 5Not coveredThe study compared pregnancies among living kidney donors in Ontario, Alberta and British Columbia with pregnancies among similarly healthy women who had not donated, using provincial health care data.View evidenceHide evidence

As stated385 donor pregnancies vs 1,540 nondonor pregnancies

Why this verdict

The profile supports the core design details: a matched cohort using provincial administrative health care databases from Ontario, British Columbia, and Alberta, with 385 donor pregnancies and 1540 matched nondonor pregnancies. However, the abstract profile describes matching on delivery date, age, time from cohort entry to delivery, prior pregnancies, and income; it does not verify that the nondonor group consisted of 'similarly healthy' women. That part is not verifiable at abstract depth.

Study evidence

The primary composite outcome of hospitalization with a diagnosis of gestational hypertension, preeclampsia, or eclampsia occurred more frequently in pregnancies after living kidney donation than in matched nondonor pregnancies.Risk ratio 1.51 (95% CI 1.10–2.08)

“This matched cohort study used provincial administrative health care databases from Ontario, British Columbia, and Alberta, Canada”

Claim 2 of 5Not coveredMost pregnancy outcomes examined were similar between the two groups, including gestational diabetes, cesarean delivery, premature birth, neonatal intensive care admission, serious maternal complications and postpartum hemorrhage.View evidenceHide evidence

Why this verdict

The abstract profile says 12 secondary maternal, fetal, and neonatal outcomes were evaluated and that only small for gestational age had a 95% CI excluding 1.00. It does not provide individual effect estimates or confirm the full list of specific outcomes named in the story, such as gestational diabetes, cesarean delivery, NICU admission, serious maternal complications, or postpartum hemorrhage. Also, lack of statistical significance is not the same as proving outcomes were similar. At abstract depth, this detailed claim is not fully verifiable.

Study evidence

Small for gestational age at birth was more frequent in pregnancies after living kidney donation than in matched nondonor pregnancies.Risk ratio 1.86 (95% CI, 1.37–2.52)

“Secondary outcomes included 12 maternal, fetal and neonatal adverse outcomes, including the individual components of the primary outcome, the composite of low birth weight or preterm birth, and small for gestational age at birth.”

Claim 3 of 5SupportedA new Canadian study published in JAMA found that most pregnancies after living kidney donation are uncomplicated.View evidenceHide evidence

Why this verdict

The abstract-level profile states in the discussion that most postdonation pregnancies were uncomplicated. The headline claim is hedged and does not imply causation, so it is supported by the paper profile.

Study evidence

“This matched cohort study used provincial administrative health care databases from Ontario, British Columbia, and Alberta, Canada”

Study evidence

Small for gestational age at birth was more frequent in pregnancies after living kidney donation than in matched nondonor pregnancies.Risk ratio 1.86 (95% CI, 1.37–2.52)

“Secondary outcomes included 12 maternal, fetal and neonatal adverse outcomes, including the individual components of the primary outcome, the composite of low birth weight or preterm birth, and small for gestational age at birth.”

Claim 4 of 5SupportedThe researchers identified a small increased risk of hypertensive disorders during pregnancy among kidney donors.View evidenceHide evidence

As stated11.9% among donors vs 8.3% among nondonors

Why this verdict

The profile reports the primary composite hypertensive-disorder outcome—hospitalization with gestational hypertension, preeclampsia, or eclampsia—as 11.9% in donor pregnancies vs 8.3% in matched nondonor pregnancies, with RR 1.51 and 95% CI 1.10–2.08. The story frames this as an association and a small absolute increase, which is supported.

Study evidence

“This matched cohort study used provincial administrative health care databases from Ontario, British Columbia, and Alberta, Canada”

Claim 5 of 5SupportedBabies born to kidney donors were more likely to be smaller than expected for their stage of pregnancy, and the researchers said further investigation is needed to confirm this secondary finding.View evidenceHide evidence

Why this verdict

The profile reports small for gestational age at birth as more frequent among donor pregnancies: 13.8% vs 7.9%, RR 1.86, 95% CI 1.37–2.52. It also identifies this as one of 12 secondary outcomes, making the story’s cautionary framing broadly consistent with the abstract-level evidence.

Study evidence

Small for gestational age at birth was more frequent in pregnancies after living kidney donation than in matched nondonor pregnancies.Risk ratio 1.86 (95% CI, 1.37–2.52)

“Secondary outcomes included 12 maternal, fetal and neonatal adverse outcomes, including the individual components of the primary outcome, the composite of low birth weight or preterm birth, and small for gestational age at birth.”

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Context layer

What the story left out

Important study details the story did not include.

The analyzed donor cohort consisted of living female kidney donors aged 18–42 with subsequent singleton pregnancies of at least 20 weeks' gestation.
The story discusses pregnancies after kidney donation generally but does not mention the abstract-level eligibility limits: donor age range, singleton pregnancies, and gestational age of at least 20 weeks.
From Retrospective matched cohort using linked provincial administrative health care databases; Retrospective matched cohort;
The comparator pregnancies were matched 1:4 to donor pregnancies on delivery date, age at delivery, time from cohort entry to delivery, number of prior pregnancies, and income; the abstract profile does not establish that nondonors were 'similarly healthy.'
The story reflects that a comparison group was used and gives the 385 vs 1540 counts, but it replaces the specified matching variables with the broader phrase 'similarly healthy,' which is not verified by the abstract profile.
From Retrospective matched cohort using linked provincial administrative health care databases
Outcome ascertainment relied on administrative health data and hospitalization/diagnosis codes, including for the primary hypertensive-disorder composite.
The story says provincial health care data were used, but it does not mention the more specific limitation that key outcomes were identified through administrative hospitalization or diagnosis codes.
From Retrospective matched cohort using linked provincial administrative health care databases

4 things the story did carry across

The study was an observational matched cohort study using provincial administrative health care databases in Ontario, British Columbia, and Alberta.
The primary outcome was a composite hospitalization diagnosis of gestational hypertension, preeclampsia, or eclampsia, and it occurred more often among donor pregnancies: 11.9% vs 8.3%, RR 1.51.
Most postdonation pregnancies were described as uncomplicated in the study discussion/conclusions.
Small for gestational age was more frequent among donor pregnancies: 13.8% vs 7.9%, RR 1.86, and was reported as a secondary outcome among 12 secondary outcomes.

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study summary

Lead result

secondary data

1Lead resultsecondary dataDetermine whether pregnancies after living kidney donation are associated with higher risk of pregnancy-related adverse outcomes compared with matched pregnancies among nondonors.Retrospective matched cohort using linked provincial administrative health care databasesExpand

In plain English

Matched cohort study using provincial administrative health databases in Ontario, British Columbia, and Alberta comparing pregnancies after living kidney donation (female donors aged 18–42 with subsequent singleton pregnancies ≥20 weeks) to 1:4 matched singleton pregnancies in nondonors. Primary composite outcome (hospitalization with gestational hypertension, preeclampsia, or eclampsia) occurred more often in donor pregnancies (11.9% vs 8.3%; risk ratio 1.51, 95% CI 1.10–2.08). Small for gestational age was more frequent among donor pregnancies (13.8% vs 7.9%; risk ratio 1.86, 95% CI 1.37–2.52).

Key findings

The primary composite outcome of hospitalization with a diagnosis of gestational hypertension, preeclampsia, or eclampsia occurred more frequently in pregnancies after living kidney donation than in matched nondonor pregnancies.Risk ratio 1.51 (95% CI 1.10–2.08)
Small for gestational age at birth was more frequent among donor pregnancies compared with matched nondonor pregnancies.Risk ratio 1.86 (95% CI 1.37–2.52)

“This matched cohort study used provincial administrative health care databases from Ontario, British Columbia, and Alberta, Canada”

2secondary dataCharacterize specific maternal, fetal, and neonatal secondary outcomes (including individual hypertensive disorder components and fetal growth outcomes such as small for gestational age) in donor vs nondonor pregnancies.Retrospective matched cohort; administrative database outcome ascertainmentExpand

In plain English

Within the matched cohort of pregnancies after living kidney donation versus matched nondonor pregnancies, 12 maternal, fetal, and neonatal secondary outcomes were evaluated. Among these secondary outcomes, only small for gestational age at birth showed a statistically notable higher risk in donor pregnancies; other secondary outcomes (including the individual hypertensive disorder components and the low birth weight or preterm birth composite) did not have 95% CIs excluding 1.00 in the abstract report.

Key findings

Small for gestational age at birth was more frequent in pregnancies after living kidney donation than in matched nondonor pregnancies.Risk ratio 1.86 (95% CI, 1.37–2.52)
Other assessed secondary maternal, fetal, and neonatal outcomes—including the individual components of hypertensive disorders and the low birth weight or preterm birth composite—were evaluated but not reported in the abstract as having 95% CIs excluding 1.00.

“Secondary outcomes included 12 maternal, fetal and neonatal adverse outcomes, including the individual components of the primary outcome, the composite of low birth weight or preterm birth, and small for gestational age at birth.”

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Method layer