MCAS. Reactions, sorted by severity and system.
Mast cell reactions hit different systems at different intensities — skin, gut, airway, heart. Leo's MCAS hub sorts each reaction by severity tier and body system, splits food from environmental triggers, and pairs with a food diary so the safe-and-unsafe picture builds itself.
Every reaction, placed on a severity scale.
Reactions are sorted into four tiers — mild, moderate, severe, anaphylactic — and broken down by body system (skin, GI, respiratory, neurological, cardiovascular), with a four-week frequency trend so escalation is visible.
Trigger analysis splits food from environmental, and a food-safety profile surfaces your high-risk and watch-list foods from what you've logged — paired with a food diary that prompts a follow-up after meals.
Reactions, triggers, and food safety.
Reaction severity
Mild, moderate, severe or anaphylactic — every reaction placed on the scale, with the distribution at a glance.
Body systems
Skin, GI, respiratory, neurological and cardiovascular — see which systems your reactions target.
Food diary
Log meals with a post-meal follow-up, so delayed reactions get connected to what you ate.
Food safety
Your high-risk and watch-list foods, surfaced from what you've logged over time.
Trigger analysis
Food vs environmental split, plus a four-week reaction-frequency trend.
Labs
CBC, CMP, inflammatory, iron, liver and vitamin D come pinned, with trends and ranges.
What ships in the MCAS hub.
Leo tracks. It doesn't diagnose.
MCAS is diagnosed by a clinician with specific lab and response criteria — Leo has no screener and makes no claim about whether you have it. It is not an allergy test and is not a substitute for an epinephrine plan.
Everything is descriptive and on-device-first. The severity tiers and food-safety profile describe what you logged; they never predict a reaction or give medical advice.
Reactions and triggers, on the record.
Reactions sorted by severity and body system, food vs environmental trigger analysis, and a food-safety profile from your own logs — organized for your immunologist or allergist.