Clinician handoff
Nutrient Deficiency
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
My brain fog has been slowly getting worse, and I want to check whether I'm deficient in something before treating this as stress or just being tired.
What would weaken it
- -No deficiency risk factors and a complete nutrient workup that's truly reassuring in context.
- -A much stronger meal-timing, positional, or stress-linked pattern than a constant depletion pattern.
- -No physical signs that usually travel with deficiency-based fog.
Key points to communicate
- •I want ferritin, B12, folate, vitamin D, CBC, and other obvious overlap labs checked directly.
- •Please tell me which deficiency risks matter most given my diet, periods, gut symptoms, or medications.
- •If deficiency looks unlikely, I want to know which cause moves up next and why.
Bring this to the visit
- •Any prior ferritin, CBC, B12, folate, vitamin D, MMA, or homocysteine results with dates.
- •A one-line list of the strongest deficiency risks: heavy periods, pregnancy/postpartum, gut issues, alcohol, restrictive eating, blood donation, bariatric history, or recent illness.
- •A medication list, especially acid blockers, metformin, oral contraceptives, and anything that changed before the fog worsened.
- •A short note on whether the fog feels gradual and constant or sharply meal-linked, positional, or stress-reactive.
Useful screening structure
- -CBC with ferritin, B12, folate, and 25-hydroxyvitamin D as minimum panel.
- -MMA and homocysteine if B12 is borderline to detect functional deficiency.
- -Iron panel (serum iron, TIBC, transferrin saturation) if ferritin alone is inconclusive.
Tests and measurements to discuss
ferritin
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.
vitamin-b12
What this helps clarify: Patient-facing vitamin B12 explainer route, useful when a story or clinician uses plain language instead of the active-B12 variant.
Range context
Lab context
How to use the result
Save the result with date and symptoms from the same week.
mma
What this helps clarify: Elevated MMA confirms B12 deficiency at tissue level
Range context
<0.4 μmol/L
How to use the result
Save the result with date and symptoms from the same week.
folate
What this helps clarify: Essential for methylation and neurotransmitter synthesis
Range context
>20 ng/mL
How to use the result
Save the result with date and symptoms from the same week.
vitamin-d-25oh
What this helps clarify: Patient-facing vitamin D explainer route matching the common 25-OH wording used in lab and search language.
Range context
Lab context
How to use the result
Save the result with date and symptoms from the same week.
homocysteine
What this helps clarify: Methylation marker linked to B-vitamin status and vascular risk context.
Range context
<8 umol/L
How to use the result
Save the result with date and symptoms from the same week.
cbc-with-differential
What this helps clarify: Core blood count panel used to review white cell patterns, hemoglobin, and platelet context.
Range context
Lab reference interval
How to use the result
Save the result with date and symptoms from the same week.
Organic rule-outs still worth naming
- •Blood loss, including heavy periods and hidden GI bleeding.
- •Malabsorption from celiac disease, gastritis, bariatric surgery, H. pylori, or inflammatory gut disease.
- •Medication-driven depletion from PPIs, metformin, and other long-term therapies.
- •Nearby overlap causes like thyroid dysfunction, sleep disruption, or blood-sugar instability when the nutrient story is incomplete.
Questions to ask directly
- •Which deficiency looks most plausible in this story, and which test best confirms it?
- •If ferritin is low-normal, how do you interpret it in context rather than from the lab range alone?
- •If B12 is borderline, should we add MMA or homocysteine before dismissing deficiency?
- •If something is low, what's the most likely reason: blood loss, poor intake, malabsorption, or medication effect?
Functional impact snapshot
- -How much does the fog change work, study, driving, exercise tolerance, or basic household tasks?
- -Which physical clues travel with it: restless legs, hair loss, pallor, tingling, bruising, shortness of breath, or feeling cold?
- -Does the fog improve at all when eating better, resting, or correcting the most obvious depletion risks?
Escalate instead of self-managing if
- •Rapid worsening, focal neurological symptoms, chest pain, syncope, or severe shortness of breath.
- •Progressive numbness, gait change, or marked weakness suggesting a neurological deficit rather than ordinary depletion.
- •Heavy ongoing bleeding, black stools, or other signs that blood loss itself needs urgent evaluation.
Peer-reviewed references