You Got Your Results. Now What?
The notification comes through your patient portal app. Your lab results are ready. You open them and see a column of names — WBC, RBC, MCV, MCH, BUN/Creatinine Ratio, eGFR — each with a number, a unit, a range, and sometimes a flag. It is a wall of data that communicates almost nothing on its own. You are not alone in this experience. Most patients receive lab results digitally today with no interpretation attached.
Start With the Flags
The fastest way to orient yourself in a lab report is to find the flagged values first. Most patient portals mark values outside the reference range with H (high), L (low), or a color indicator. A flag does not mean something is wrong — it means the value sits outside the range that covers the middle 95 percent of the population sample the lab used to build its reference interval. Some flags warrant follow-up. Many are minor variations with no clinical significance. The flag is a prompt to look more carefully, not a cause for alarm.
The Most Common Tests and What They Measure
- Hemoglobin and Hematocrit: How well your red blood cells are carrying oxygen. Low values can explain fatigue and breathlessness.
- eGFR (Estimated Glomerular Filtration Rate): A calculation of kidney filtering efficiency. Declining eGFR over time is more meaningful than any single reading.
- ALT and AST: Liver enzymes. Elevated values suggest liver cell stress — the enzymes leak into the bloodstream when liver cells are damaged or inflamed.
- HbA1c: A three-month average of blood glucose levels. Used to assess long-term blood sugar regulation independent of what you ate the day of the test.
- TSH: The pituitary hormone that regulates thyroid activity. A high TSH means the pituitary is working harder to stimulate an underperforming thyroid.
Understanding What "Normal" Means — and Doesn't Mean
Reference ranges are statistical constructs built from population data. They are not personalized to your age, sex, fitness level, or health history. A value can sit well within the reference range and still be suboptimal for you individually — and a value slightly outside the range may be entirely unremarkable in your context.
Get a Straight Answer
FreeHealth.ai connects to your MyChart account, imports your lab results, and gives you a plain-language interpretation of every value — what it measures, what your number indicates, and how it compares to your own history. Free to start. No credit card.
