A complimentary clinical symptom assessment that helps you understand what your body is telling you and whether functional medicine care may be right for you.
Take the Parsley Symptom Index
A clinical way to understand your symptoms
The Parsley Symptom Index, or PSI, is a proprietary health assessment developed by Parsley Health clinicians to evaluate how symptoms show up across the body.
Rather than looking at symptoms in isolation, the PSI helps identify patterns across multiple systems, offering a clearer picture of what may be driving how you feel.
It is used in Parsley care to guide clinical conversations and track progress over time, and it is also available here as a free starting point for anyone seeking clarity.
What you'll get from PSI in 5 minutes
Your results are educational, not diagnostic. They are designed to help you better understand your health and decide what to do next.
A personalized symptom score across nine body domains
Insight into which systems may need support
Context for how symptoms may be connected
Clear next-step options, whether you want to explore care, labs, or learn more
Why your symptoms matter
Together, your symptoms tell a story. The PSI helps make that story visible.
Symptoms are early signals
Symptoms often appear long before lab values cross a clinical threshold. Fatigue, brain fog, bloating, mood changes, or sleep issues can signal system imbalance years before a diagnosis is made.
Symptoms are interconnected
A single symptom rarely belongs to just one system. Stress affects digestion. Hormones affect mood. Blood sugar affects energy. Looking at symptoms together reveals connections that isolated tests can miss.
Your experience is data
Medicine tends to prioritize lab values over patient experience. The PSI treats how you feel as essential clinical information—capturing changes in quality of life, not just numbers on a page.
The 9 body domains assessed
The PSI evaluates symptoms across nine interconnected body domains that influence daily health and long-term wellbeing:
01
Neurological: Mood, focus, memory, and cognitive clarity
02
Musculoskeletal: Pain, inflammation, mobility, and recovery
03
Gastrointestinal: Digestion, absorption, immunity, and gut balance
04
Metabolic: Blood sugar regulation, energy, and weight patterns
05
Respiratory: Breathing, immune load, and environmental sensitivity
06
Cardiac: Cardiovascular stamina, circulation, and resilience
07
Hair & Skin: Visible signals linked to hormones, nutrients, and inflammation
08
Mental & Emotional: Stress response, sleep, and emotional regulation
09
Reproductive & Genital: Hormonal patterns, menstrual health, libido, and fertility
Built by clinicians, grounded in care
The Parsley Symptom Index was developed by Dr. Robin Berzin, MD, founder, and CEO of Parsley Health, in collaboration with Parsley’s senior clinical team.
The PSI is a patient-reported outcomes survey created to help clinicians and patients track how health changes over time. It is designed in alignment with FDA guidance and has been clinically-validated. It reflects decades of clinical experience caring for people with complex, persistent symptoms and is continuously refined as Parsley’s care evolves.
How the PSI fits into care
Parsley members complete the PSI before their first visit and periodically over time. Clinicians use it to guide conversations, monitor progress, and understand how changes in care affect quality of life. Nearly 9 out of 10 members report symptom improvement within their first year of care.
