Clinician handoff
Pregnancy
Designed for a 60-second scan in primary care. Use this to explain why this theory fits, what would weaken it, and which tests are most worth discussing.
Why this still fits
The fog feels more than just normal pregnancy tiredness. Can we check my iron and thyroid to make sure nothing treatable is making it worse?
What would weaken it
- -No real pregnancy timeline link between the cognitive change and the rest of the physical changes.
- -A stronger fit with sleep apnea, thyroid disease, depression, or another cause that stands on its own.
- -No pregnancy-related overlaps such as nausea, sleep disruption, iron issues, or thyroid shift.
Key points to communicate
- •I want iron (ferritin) and thyroid checked - the fog feels more severe than expected for normal pregnancy.
- •If I have persistent headaches, visual changes, or swelling, I understand these could be signs of preeclampsia and want them evaluated.
- •If mood is low or anxiety is high, I would like perinatal depression/anxiety screening - EPDS is more specific than PHQ-9 for this period.
- •If I have started snoring or my partner says I stop breathing at night, can we discuss a sleep study? Pregnancy-onset sleep apnea is underdiagnosed.
Bring this to the visit
- •Current gestational age and any pregnancy complications.
- •Pre-pregnancy cognitive baseline - was this present before pregnancy?
- •Current prenatal vitamins, iron, and any supplements.
- •Sleep quality and duration, especially in the third trimester.
Useful screening structure
- -EPDS (Edinburgh Postnatal Depression Scale) - also validated for prenatal depression.
- -Thyroid panel (TSH, Free T4) since pregnancy alters thyroid requirements.
- -Ferritin and CBC since iron deficiency is very common and worsens pregnancy fog.
Tests and measurements to discuss
CBC with ferritin (check for iron-deficiency anemia)
What this helps clarify: Iron storage marker that can affect energy, focus, and cognition.
Range context
40-100 ng/mL
How to use the result
Save the result with date and symptoms from the same week.
TSH and Free T4 (thyroid function - trimester-specific ranges)
What this helps clarify: Thyroid hormone precursor - low levels indicate hypothyroidism
Range context
1.0–1.5 ng/dL
How to use the result
Save the result with date and symptoms from the same week.
Vitamin D level
What this helps clarify: Severe deficiency doubles dementia risk
Range context
40–60 ng/mL
How to use the result
Save the result with date and symptoms from the same week.
Glucose screening (gestational diabetes, usually 24-28 weeks)
What this helps clarify: This cluster is mainly there to rule out common medical overlaps that can mimic or amplify cognitive fog before settling on a single explanation.
Edinburgh Postnatal Depression Scale (EPDS) - more specific to perinatal period than PHQ-9
What this helps clarify: Depression screening - overlap with brain fog symptoms
Range context
Score <5
How to use the result
Save the result with date and symptoms from the same week.
Blood pressure monitoring (preeclampsia screening)
Vitamin D
Deficiency is common in pregnancy and associated with fatigue and adverse outcomes.
What this helps clarify: Severe deficiency doubles dementia risk
Range context
40–60 ng/mL
How to use the result
Save the result with date and symptoms from the same week.
Questions to ask directly
- •Is my fog from normal pregnancy hormones, sleep disruption, or an identifiable deficiency?
- •Should we check iron, thyroid, and vitamin D given how common deficiency is in pregnancy?
- •Are any of my symptoms concerning for preeclampsia or other pregnancy complications?
- •Will the fog improve postpartum, and what's a realistic timeline?
Functional impact snapshot
- -Rate cognitive function by trimester to track the trajectory.
- -Track fog against sleep quality and iron supplementation adherence.
- -Note whether work performance or safety (driving, operating equipment) is affected.
Escalate instead of self-managing if
- •Severe headache with visual changes, swelling, and elevated BP - preeclampsia signs.
- •Severe depression or anxiety affecting daily function during pregnancy.
- •Confusion or altered consciousness - not normal pregnancy fog, needs urgent evaluation.
Peer-reviewed references
- 1. 10.5694/MJA17.00131 [DOI]
- 2. 10.1097/OGX.0000000000000655 [DOI]
- 3. Younis J et al. Exploring the influence of pregnancy on cognitive function in women: a systematic review. BMC Pregnancy Childbirth. 2025;25:88. PMID:39885454 [DOI]
- 4. Hoekzema et al., Nat Neurosci, 2017 - Pregnancy leads to long-lasting changes in human brain structure. PMID:27991897 [DOI]