MyChart Blood Test Results Explained
What each part of the Results screen means, why some values show up before your doctor has commented, and how to get a plain-English explanation of your own numbers.
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· · Reviewed against the sources listed at the end of this page.
The Quick Answer
If you just opened MyChart and saw a blood test result with no comment from your doctor yet, that is normal, not a mistake. A federal rule (the 21st Century Cures Act) generally requires labs to release finalized results to your portal quickly, which often happens before your provider has had time to review them.
An H or L next to a value, or red or bold highlighting, simply means that number fell outside the reference range that particular lab uses for a healthy adult. It is a statistical flag, not a diagnosis, and a single mildly flagged value is common. Your provider will review it and reach out if it needs action.
What You Will See on the Results Screen
MyChart looks slightly different from one health system to the next, but the Test Results detail screen almost always includes the same seven building blocks.
Test name
The name of the individual marker, such as Glucose, Hemoglobin, or TSH, or the name of a whole panel, such as Comprehensive Metabolic Panel, that contains several markers.
Tip: Panels list every component underneath the panel name. Scroll the whole panel; do not stop at the first line.
Your value
The number the lab measured for you on the date the sample was collected, shown with its unit of measurement, such as mg/dL or mIU/L.
Tip: Units matter. The same test can sometimes be reported in different units by different labs, which changes what a normal number looks like.
Reference range (or Normal Range)
The range that lab considers typical for a healthy adult, usually printed right next to your value, for example 70 to 99 mg/dL.
Tip: Every lab sets its own range using its own equipment and population. If you switch labs, the range printed next to the same test can shift slightly.
Flag column (H, L, or highlighted text)
A marker, letter, or color that appears only when your value falls outside that lab's reference range.
Tip: No flag simply means the value fell inside the statistical range that lab uses. It is a sorting tool, not a diagnosis.
Collected and resulted dates
Collected is when your blood was drawn. Resulted (or Reported) is when the lab finished the analysis and the number became available.
Tip: These are usually the same day for routine blood work, but can be a day or more apart for tests that need to be sent to a specialty or reference lab.
Comments or narrative section
Free-text notes from the lab or your provider, sometimes explaining a flagged value, sometimes just confirming the result was reviewed.
Tip: Not every result gets a comment. An empty comment box usually means nothing urgent, not that the result was skipped.
Download, print, or share icon
A small icon, usually near the top of the result detail screen, that generates a PDF or opens a print preview of that result.
Tip: This is the file you want if you plan to bring your results to a specialist, keep a personal record, or upload them to a tool like SmarterBlood.
Why Results Often Appear Before Your Doctor Has Reviewed Them
This surprises a lot of people the first time it happens, so it is worth explaining plainly. It is not that your provider forgot about you or ignored your result. It is the order the system now works in.
Under the information-blocking provisions of the 21st Century Cures Act, health systems are generally required to make electronic health information, including most laboratory results, available to patients without unreasonable delay once it is finalized. Before this rule took effect, many health systems held results back until a provider had signed off on them. Now, the release to your portal and the provider's review often happen in parallel rather than one after the other.
Your blood is drawn
At a lab draw site, hospital, or your provider's own office. The sample is labeled and sent to the laboratory that will run the analysis.
The lab analyzes the sample
Modern lab analyzers process most routine chemistry and blood count tests in minutes to a few hours. Some specialty tests, cultures, or send-out tests can take days.
The lab finalizes and verifies the result
A result is checked against quality controls and, for unusual or critical values, reviewed by lab staff before it is marked final in the laboratory system.
The result is released to the patient portal
Under the 21st Century Cures Act information-blocking rules, most finalized lab results must be made available to you electronically without unreasonable delay, which is why many results now post to MyChart automatically, often before your provider has personally reviewed them.
Your provider reviews the result on their own schedule
Your doctor or their care team typically reviews new results within a few business days and will reach out, add a comment, or discuss it at your next visit if something needs attention. Seeing a result first does not mean it has been overlooked.
What the Abnormal Highlighting Actually Means
Every value on a lab report is compared to a reference range: the span of results that lab typically sees in a large group of healthy people. When your number falls outside that span, MyChart marks it, usually with an H for high, an L for low, red text, or a small exclamation icon depending on your health system's setup.
Reference ranges are usually built so that about ninety-five percent of healthy people fall inside them, which also means roughly one in twenty healthy people will land outside the range on any single test, for no concerning reason at all. A flag tells you a number is statistically unusual for that lab. It does not, by itself, tell you why.
Common, usually benign explanations for a single flagged value include recent exercise or dehydration before the draw, a minor cold or infection, normal day-to-day variation, medication you are taking, or simply a range set slightly differently by that particular lab. Less commonly, a flagged value can be an early sign of something that does need follow-up, which is exactly why your provider looks at the whole panel and your history together rather than judging one number in isolation.
Common Tests People Check After a Routine Visit
These five panels cover most of what shows up in MyChart after an annual physical or a standard blood draw. Ranges below are typical for adults and vary by lab, sex, age, and method, so always check the range printed on your own report.
Complete Blood Count (CBC)
Red cells, white cells, and platelets, giving a broad snapshot of anemia, infection, or clotting ability.
A single mildly low or high value on a CBC component is common and often not significant on its own; your provider looks at the whole panel together.
Comprehensive Metabolic Panel (CMP or BMP)
Blood glucose, kidney function (creatinine, BUN), electrolytes (sodium, potassium), and often liver enzymes.
Whether you fasted before the draw can change the glucose result, so check whether your provider asked you to fast.
Lipid panel (cholesterol)
Total cholesterol, LDL, HDL, and triglycerides, used to estimate cardiovascular risk over time.
Target ranges for LDL and triglycerides are often set individually based on your other risk factors, not just the lab's printed range.
Hemoglobin A1c
Your average blood sugar over roughly the past two to three months, used to screen for and monitor diabetes.
A1c reflects an average, so it will not show a single high or low blood sugar reading the way a same-day glucose test does.
Thyroid-stimulating hormone (TSH)
How hard your pituitary gland is signaling your thyroid to work, used to screen for an underactive or overactive thyroid.
TSH moves in the opposite direction to thyroid hormone levels, so a high TSH usually suggests an underactive thyroid, and a low TSH an overactive one.
When to Call Your Provider Promptly, Instead of Waiting
Most flagged results can wait for your provider's usual review, typically within a few business days. A short list of situations should prompt a phone call sooner:
A result marked critical, panic value, or extremely far outside the range
Labs use a separate, wider threshold for values considered dangerous. If your report uses one of these words, most health systems will also try to reach you by phone. If you see one of these labels and have not heard from your provider's office within a few hours, call them.
A flagged blood count alongside fever, unusual bruising, or bleeding
A low white cell count with fever, or a low platelet count with unexplained bruising or bleeding gums, should prompt a same-day call to your provider rather than waiting for the portal comment.
A very high or very low glucose alongside symptoms
Extreme thirst, confusion, rapid breathing, or feeling faint alongside a very abnormal glucose result warrants urgent medical attention, not a wait-and-see approach.
A flagged kidney or electrolyte value with vomiting, muscle weakness, or a fast or irregular heartbeat
Sodium and potassium abnormalities can affect heart rhythm. If you have these symptoms alongside a flagged sodium or potassium result, seek care promptly.
Any result you do not understand alongside symptoms that worry you
You do not need to correctly interpret the lab science yourself to know when something feels wrong. Trust how you feel, and call your provider's office or a nurse advice line if in doubt.
How to Download or Print Your MyChart Results as a PDF
The exact button placement varies by health system, but the process is the same five steps almost everywhere.
Open the Test Results section
Sign in to MyChart on the web or in the app and go to the menu item usually called Test Results, Results, or Health Summary, depending on your health system.
Select the specific result or date
Tap or click the test date you want. This opens the detail view with every component, value, range, and any flags for that visit.
Look for a download, print, or share icon
On the web, this is often a small printer or download icon near the top right of the result. On the mobile app, it is usually a share icon at the bottom of the screen.
Save it as a PDF
Choosing print will normally open your browser or phone's print dialog, where you can select "Save as PDF" or "Save to Files" instead of sending it to an actual printer. If MyChart offers a direct download or export button, that will save a PDF automatically.
Upload the PDF, or just the photo, to SmarterBlood
Go to the SmarterBlood upload page and add the PDF you just saved. If you only have a printed copy, a clear photo of the whole page works too. Alternatively, email the file to mail@smarterblood.org.
What Happens When You Upload Your Results to SmarterBlood
Reads the whole report automatically
SmarterBlood's AI extracts every marker from your uploaded PDF or photo, including panels with many components, so you do not have to type anything in by hand.
Explains each value in plain English
Every marker gets a short explanation of what it measures and why it might be high or low, in everyday language rather than lab shorthand.
Graphs your results over time
Upload results from more than one visit, even from different labs or health systems, and SmarterBlood plots them on a single graph so you can see whether a value is trending up, down, or holding steady.
Flags anything outside the typical range
Out-of-range values are highlighted automatically, the same idea as the H and L flags in MyChart, but with the plain-English context alongside them.
Gives you a printable summary for your doctor
Generate a short report you can bring to an appointment or a specialist, which can be a useful starting point for a conversation about a trend you have noticed.
Free, and works with any lab or portal
SmarterBlood is free to use and is not tied to MyChart, Epic, or any single lab. Any pathology report you can save as a PDF or photograph will work.
Sources and reference ranges
Adult reference ranges on this page follow the AACB and RCPA harmonised reference intervals unless stated otherwise; the range printed on your own report always takes precedence because laboratories differ.
MyChart Blood Test Results, Frequently Asked Questions
What is MyChart?
MyChart is a patient portal built by Epic Systems and used by many hospitals, health systems, and clinics across the United States to let patients see their own health information online, including appointments, messages, and lab results. Each health system runs its own copy of MyChart, so the exact layout, colors, and menu names can vary slightly from one provider to the next, but the core Results screen works the same way almost everywhere.
Why can I see my blood test results in MyChart before my doctor has called me?
A federal rule known as the 21st Century Cures Act requires most electronic health information, including many laboratory results, to be released to patients without unreasonable delay once the lab finalizes them. In practice that often means the result posts to your MyChart account automatically, sometimes within minutes to hours of the lab completing the test, which can be well before your doctor has had a chance to sit down and review it. A small number of sensitive result types can be held back for a short period under specific exceptions, but routine blood work is usually released right away.
What does the abnormal or highlighted flag next to a result mean?
Most MyChart Results screens print a small letter next to any value outside the laboratory reference range, typically H for above range and L for below range, sometimes shown as red text, bold text, or an exclamation icon instead. This flag is generated automatically by comparing your number to a statistical range built from a large group of healthy people. It does not mean you have a specific disease. Many flagged results turn out to be mild, a normal individual variation, or a temporary change from things like recent exercise, dehydration, a cold, or the time of day the sample was taken.
Should I be worried if I see a red or flagged result in MyChart?
Usually no, not on its own. Reference ranges are set so that roughly one in twenty healthy people will fall outside them on any single test, so an isolated flag is common and often not clinically significant. What matters more is how far outside the range the value is, whether it fits a pattern with your other results, and whether you have symptoms. If a value is only slightly outside the range and you feel well, it is reasonable to wait for your provider’s comment. If a value is far outside the range, or you have symptoms that match it, contact your provider’s office promptly rather than waiting.
How do I download or print my MyChart lab results as a PDF?
On the MyChart website, open Test Results, select the result you want, and look for a download, print, or export icon near the top of the report, which will generate a PDF or open a print preview you can save as a PDF. On the MyChart mobile app, the option is usually under a share or export icon on the result detail screen. If your health system has not enabled a direct download button, you can still use your browser or phone’s built-in Print to PDF feature from the results page, or ask the clinic to print a paper copy and photograph it.
Can I upload my MyChart results to SmarterBlood?
Yes. Once you have your MyChart result saved as a PDF, or even just photographed with your phone, you can upload it to SmarterBlood for free. SmarterBlood extracts every marker, explains each one in plain English, and plots your results on a graph over time, including results from other labs or providers, so you can see the trend rather than just one snapshot. You can also email the PDF or photo to mail@smarterblood.org if that is easier than uploading from your phone.
Is SmarterBlood affiliated with MyChart or Epic Systems?
No. SmarterBlood is an independent tool and has no affiliation, partnership, or data connection with Epic Systems, MyChart, or any specific health system or laboratory. It simply reads the PDF or photo of a lab report that you choose to upload, the same report you already downloaded from your own MyChart account, and explains it.
What if my doctor hasn't left a comment on the result yet?
Providers review results on their own schedule, which is often a few business days after the result posts, and not every result gets a written comment if nothing about it needs to change your care. If you are unsure whether a flagged result needs attention and it has been more than a few business days with no comment, most MyChart systems let you send a secure message directly to your provider's office to ask, which is generally faster than waiting for the next visit.
Related Reading
Already Have Your MyChart Results Saved?
Upload the PDF or a photo and SmarterBlood will explain every marker in plain English, flag anything outside the typical range, and graph your results over time, free.
This page provides general educational information about the MyChart patient portal and how to read a laboratory Results screen. It is not a substitute for professional medical advice, diagnosis, or treatment, and it is not affiliated with Epic Systems or any health system that uses MyChart. Always talk to your own provider about your own results. SmarterBlood does not provide medical care.