After the ER: The Follow-Up Visit You Were Told to Get

TL;DR: The emergency room checks for the things that could hurt you right away, and it is built to stop there. The follow-up visit is where someone reads the whole report, finds the tests that had not come back yet, checks your new medicines against your old ones, and looks at you again now that a day or 2 has passed. Go back to the ER, or call 911, if a headache keeps getting worse, you throw up over and over, you have a seizure, one side of your body feels weak or numb, your speech is slurred, your vision changes, 1 pupil is bigger than the other, clear fluid drips from your nose or an ear, or you get more confused, more sleepy, or hard to wake up. If you take a blood thinner, go back sooner rather than later. Bring your discharge papers, the scan report and the scan images, and a list of everything you were given. If your own doctor cannot see you for months, you do not have to wait for that appointment to get the follow-up started.

You are home now, probably tired, holding a piece of paper that says to follow up with your primary care physician in 3-5 days. You called, and the first opening is months out. That gap is why this page exists, and none of it means you did anything wrong or asked in the wrong way.

The first thing to settle is what that instruction was asking for, because it changes what you push for on the phone. If you read only 1 section on this page, make it the list of reasons to go back to the emergency department.

What does "follow up with your primary care doctor" mean?

That line at the bottom of your discharge paper is a clinical instruction with a job attached, and the job is bigger than it looks. The emergency department answered a single question about you: is something happening right now that has to be treated right now. Everything the team did pointed at that question, and when the answer came back reassuring, you went home. The workup was designed to end there.

Emergency medicine is built to rule out the dangerous diagnosis quickly and move the patient to the right next setting. Doing that well means certain questions stay open on purpose:

• Why it happened. A head CT can show there is no bleeding inside your skull. It cannot tell you why you fell, whether your blood pressure drops when you stand up, or whether a medication you take is making you unsteady.
• What comes back later. A urine or blood culture takes a day or more to grow, and the sensitivities that say whether your antibiotic will work take longer. Some blood tests are still processing when the discharge paper prints.
• What the scan saw that nobody was looking for. A CT ordered for belly pain images the lungs, the liver, the kidneys, and the adrenal glands on the way past.
• How the new medications fit the rest of your list. The team prescribed against what they could see in front of them that night.
• How you look 48 hours later. Some conditions declare themselves with time, and the emergency department does not have that time.

There is also a communication problem baked into the moment of discharge, and it has been measured. In a study of 140 adults interviewed after they left an emergency department, 78% had a gap in their understanding of at least 1 of the 4 things that matter most on the way out: the diagnosis and its cause, the care they received, what to do at home, and when to come back. Only 13% understood all 4. Half had gaps in 2 or more. And when patients did have a gap, they noticed it only about 20% of the time, which is the harder half of the finding.

A follow-up study by the same group asked where those gaps were worst, and the answer was the 2 areas that matter most once you are standing in your own kitchen. Severe deficits, meaning minimal or no understanding, ran 50.7% for return instructions and 40.1% for home care instructions, against 3.2% for the diagnosis itself. So the piece of information people are least likely to have straight when they get home is the one about when to come back.

What should a good follow-up visit after the ER cover?

A follow-up visit after an ER discharge has a defined job, and it is more than a wellness check. Here is what it should work through.

1. Read the documents rather than the memory of them. The verbal summary you got at 3 AM, from a physician holding 12 other patients, is a compressed version of a longer record. The discharge summary, the radiology report in full, and the lab values themselves say more. The paragraph at the bottom of a radiology report, under "impression" or "additional findings," is where the sentence nobody mentioned tends to live.

2. Sort what was ruled out from what was never asked. These are different, and they get blurred together into "everything came back normal." A negative head CT rules out a bleed and a skull fracture. It says nothing about a concussion, which is a functional injury that does not appear on imaging. A normal troponin says your heart muscle was not being damaged during those hours, which is a snapshot rather than an explanation. It does not answer why you have been short of breath for 3 weeks.

3. Chase what is still in flight. Cultures are the common one, and somebody has to look at them. At teaching hospitals a scan read quickly overnight gets a second, final interpretation from an attending radiologist the next day, and the final report is the one that counts. Pathology from a biopsy or a wound culture takes longer still. Ask, by name, what was pending when you left.

4. Look at the incidental findings. Roughly 1 in 3 CT scans done in an emergency department turns up something the scan was not looking for. A pooled analysis of 69 studies covering 147,763 emergency department encounters put the prevalence of any incidental finding at 31.3%. Most are harmless. Some are a lung nodule, a thyroid nodule, an adrenal lesion, or an aortic aneurysm that needs a repeat scan on a defined schedule, and the schedule is where they go missing. In a review of 682 emergency CT scans at 1 hospital, 348 incidental findings turned up across 33.4% of the scans, and 34 of those findings (9.8%) made it into the paperwork the patient carried home. Your report may name something your discharge sheet never did.

5. Reconcile the medications. You may have left with an antibiotic, a steroid, an anti-nausea medication, or a topical. The follow-up visit is where the new list gets checked against the old one for duplicates, interactions, and doses that need adjusting for your kidney function. If you take an anticoagulant, an antiplatelet agent, a blood pressure medication, or anything with a narrow safe range, this step carries the most weight.

6. Repeat the exam. Time is a diagnostic tool. Appendicitis that looks like nothing at hour 4 can be obvious at hour 30. A neurologic exam done 3 days after a head injury reads differently than one done in the first hour, when adrenaline is still doing some of the work. A wound checked at 48 hours tells you whether the redness is healing inward or spreading outward. Repeating the exam is the cheapest test in medicine and the one skipped most often.

7. Decide what still needs a test, and say out loud what does not. For an uncomplicated concussion, repeat brain imaging is not indicated; imaging belongs in the picture when the course is atypical or a structural lesion is suspected. For a first kidney stone, a metabolic workup a few weeks out is more useful than another scan. For a fall, the question worth answering is usually why you fell, and that answer comes from a blood pressure sitting and standing, a medication review, and a gait exam rather than from imaging.

Which symptoms mean go back to the ER instead of waiting?

Nothing on this page is a reason to wait out a symptom that is getting worse. If any of the following is happening, the emergency department is the right place, and 911 is the right call if you cannot get there safely. Going back is part of how the plan was designed, and the return instructions on your paper exist because your physician expected some people to use them.

After a head injury

The U.S. Centers for Disease Control and Prevention (CDC) lists these as danger signs after a bump, blow, or jolt to the head. Contact a clinician or go to an emergency department right away if you have:

• A headache that keeps getting worse and does not go away
• Weakness, numbness, or decreased coordination
• Repeated vomiting or nausea
• Slurred speech

The people keeping an eye on you should call 911 or take you in right away if you:

• Look very drowsy or cannot be woken up
• Have 1 pupil (the black center of the eye) larger than the other
• Have convulsions or seizures
• Cannot recognize people or places
• Become more and more confused, restless, or agitated
• Behave in a way that is unlike you
• Lose consciousness, even briefly

A few more belong on the same list. Clear fluid or blood draining from the nose or an ear can point to a skull fracture and needs emergency care. A new vision change counts, and so does neck pain that is new or getting worse, since the neck absorbed the same force the head did.

Blood thinners lower the threshold, and they lower it considerably. If you take warfarin, apixaban, rivaroxaban, dabigatran, clopidogrel, ticagrelor, or daily aspirin, bleeding inside the skull can appear hours or days after a head injury whose first scan was clear. The American College of Emergency Physicians (ACEP) 2023 clinical policy on mild traumatic brain injury does not call for routine repeat scanning or routine observation for these patients when the initial CT shows no hemorrhage and the neurologic exam is at baseline. It does call for discharge instructions that spell out the symptoms of delayed bleeding. Those instructions are the plan. Any of the signs above, in a person on a blood thinner, goes back the same day rather than waiting for an appointment.

After any ER visit

• Fever that starts after you got home, or a fever alongside an infection that is spreading
• Pain that is worse than when you left, or pain that has moved to a new place
• New shortness of breath, chest pain or pressure, or a fast heart rate that will not settle
• A wound or surgical incision where the redness is spreading outward, where the skin is hot and tight, or that starts draining
• Vomiting or diarrhea persistent enough that you cannot keep fluids down
• A rash that appears after a new medication, or any swelling of the face, lips, or tongue
• Weakness on one side, a facial droop, trouble speaking, or a sudden severe headache, which is a 911 call
• Anything your discharge paper named specifically as a reason to return

Return visits are ordinary. About 4.5% of adult emergency department visits in the United States in 2018 were revisits inside 72 hours, and the physicians writing discharge instructions expect a share of those returns. Being sent home a second time is a good outcome.

What should you bring, or send ahead?

Bring more than you think you need, and send it ahead if the practice will take it, so the physician reads it before the visit rather than during it.

• The discharge paperwork, all of it, including the page listing what to watch for
• The radiology report and the images. The report sits in the chart of the practice that ordered the scan; the image files live at the facility that performed it, so ask that facility directly for a disc or a portal link. Both matter, because a report reads in a minute and a side-by-side comparison against an older scan takes the pictures themselves.
• Every prescription you were given, including anything filled at the hospital pharmacy, and the bottles if you have them
• The names of the tests still pending when you left: cultures, a final radiology read, pathology, anything sent to an outside lab
• The hospital name, and the date and time of the visit, which is what a records request needs
• Your own account of what happened, including whatever you did not think to mention in the room

One Philadelphia shortcut helps here. Penn, Jefferson, and Temple all run their patient portals on Epic MyChart, and the discharge summary, the radiology report, and most lab values are usually downloadable within a day of the visit. Our walkthrough of the MyChart export has the screenshots for phone and desktop. If an office has gone quiet on a records request, the records-chase guide covers your legal right of access and the deadlines that come with it.

What can you do when your own doctor cannot see you for months?

Offices get overwhelmed, and that is a structural problem rather than a moral failing. A primary care physician in Philadelphia is often responsible for 2,000 to 3,000 patients. At that size the acute slots are spoken for by 8 AM and the next routine opening truly is months away. The person at the front desk telling you March is working inside a system built to run that way, and none of it changes the fact that you were told to be seen this week.

Several things are worth trying, in this order:

1. Call back and use the words on the paper. Say "emergency department discharge, told to follow up in 3-5 days." Many practices hold acute slots that never appear on the online scheduler, and a post-ER follow-up is the kind of visit they are held for.
2. Ask for a nurse triage call instead of an appointment. That is often available the same day, and a nurse can escalate you inside the practice in a way the scheduling line cannot.
3. Ask whether a video visit is available sooner than an in-person one. For reviewing a report, chasing a pending culture, and reconciling medications, video does the job.
4. Ask the hospital. Many Philadelphia emergency departments run a follow-up or transitions clinic built for this window, and the discharge nurse can tell you whether yours does.
5. If nobody can meet the window on your paper, say that plainly and ask what they recommend instead. Write down the answer and the date you asked.
6. If a symptom changes while you wait, stop waiting. A changing symptom is a different clinical situation than the one you were discharged with.

How does Fishtown Medicine handle a visit after the ER?

At Fishtown Medicine the visit starts with the documents. You send what you have, or you sign a release and our team sends the requests, and Dr. Ash reads the discharge summary and the full radiology report before the conversation rather than during it. The visit then works through what was ruled out, what was never asked, what is still pending, how the new medications sit against the old list, and what your exam looks like now that time has passed. When the exam has to be hands-on, that happens in person.

Care here is a flat fee paid directly to the practice rather than billed to your insurance. Labs, imaging, prescriptions, and specialists still run through your health insurance, and Dr. Ash can place those orders at the first visit rather than waiting for old records to arrive. When a test is not covered, or a high deductible makes cash cheaper, we compare Philadelphia prices with you first and pass the rate through without a markup. Prior authorizations are ours to handle. For neighbors who need a single visit rather than ongoing care, Fishtown Medicine runs a pay-what-you-can urgent care option.

Fishtown Medicine does not serve patients on Medicare or Medicaid, since the federal billing rules and the flat-fee model do not fit together. If that describes you or someone in your family, our Medicare and Medicaid guides point toward good primary care and free counseling here in the city.

Establishing care takes a little time, and it does not take months. Tell Dr. Ash what happened through the intake, and a free 20-minute call with him follows from there. While you are waiting on any appointment anywhere, the emergency department is still the right answer for anything on the return list above.

Guidance from the Clinic

"What I want you to know is that the emergency department did its job, and its job has an edge to it. They answered whether you needed something in the next few hours, and they answered it well. Why it happened, what the scan noticed on the way past, what the culture grows on Thursday, all of that is a different question, and it belongs to whoever sees you next. I read the report before I sit down with someone after an ER visit, because the last paragraph of a radiology report is where I keep finding the sentence nobody mentioned at discharge. And if that headache is getting worse while you are waiting to see me, please go back. I would much rather you go and be sent home again."

Related at Fishtown Medicine

• Know Where to Go: The Emergency and Urgent Care Guide - the 3-tier framework for deciding between a message, urgent care, and the ER
• Hospitalization Support - what coordination looks like when an ER visit turns into an admission
• Same-Day Sick Visits in Philadelphia - how acute issues are handled, and what they cost across the local options
• Same-Day Primary Care in Philadelphia - what "same-day" means across different practice models
• When Your Practice Stops Calling Back - your legal right to your records, the 30-day deadline, and how to escalate
• Building Your Health History: How to Share Previous Records - the MyChart export walkthrough, with screenshots
• Managing Labs and Imaging With Ease in Philadelphia - how orders, insurance, prior authorizations, and cash pricing work here
• Migraine vs. Serious: When to Worry About a Headache - the SNOOP checklist for headache red flags
• Understanding Brain and Head Imaging - what a CT answers, what an MRI answers, and when a repeat scan earns its place

Scientific References

1. Engel KG, Heisler M, Smith DM, Robinson CH, Forman JH, Ubel PA. "Patient Comprehension of Emergency Department Care and Instructions: Are Patients Aware of When They Do Not Understand?" Annals of Emergency Medicine. 2009;53(4):454-461.e15. doi:10.1016/j.annemergmed.2008.05.016. Structured interviews of 140 adults after ED discharge across 2 health systems; 78% had deficient comprehension in at least 1 of 4 domains, 51% in 2 or more, only 13% understood all 4, and patients perceived a deficit only about 20% of the time.
2. Engel KG, Buckley BA, Forth VE, et al. "Patient Understanding of Emergency Department Discharge Instructions: Where Are Knowledge Deficits Greatest?" Academic Emergency Medicine. 2012;19(9). doi:10.1111/j.1553-2712.2012.01425.x. Knowledge assessed across diagnosis, medications, home care, follow-up, and return instructions for 5 common ED diagnoses; severe deficits were most pronounced for return instructions (50.7%) and home care (40.1%).
3. Evans CS, Arthur R, Kane M, et al. "Incidental Radiology Findings on Computed Tomography Studies in Emergency Department Patients: A Systematic Review and Meta-Analysis." Annals of Emergency Medicine. 2022;80(3):243-256. 69 studies covering 147,763 ED encounters or radiology reports across 16 countries; pooled prevalence of any incidental finding 31.3% (95% CI 24.4% to 39.1%).
4. Thompson RJ, Wojcik SM, Grant WD, Ko PY. "Incidental Findings on CT Scans in the Emergency Department." Emergency Medicine International. 2011;2011:624847. A review of 682 emergency CT scans in 600 discharged adults: 348 incidental findings documented across 228 scans (33.4%), of which 34 (9.8%) were reported to patients in the discharge paperwork.
5. U.S. Centers for Disease Control and Prevention. "Symptoms of Mild TBI and Concussion." The danger-sign list used above, including the signs that call for 911 or immediate emergency department evaluation.
6. American College of Emergency Physicians Clinical Policies Subcommittee. "Clinical Policy: Critical Issues in the Management of Adult Patients Presenting to the Emergency Department With Mild Traumatic Brain Injury." Annals of Emergency Medicine. 2023;81(5):e63-e105. Level B recommendations against routine repeat imaging and routine admission for anticoagulated or antiplatelet-treated patients at neurologic baseline with an initial CT showing no hemorrhage, and a consensus recommendation for discharge instructions covering the symptoms of delayed hemorrhage.
7. Mayo Clinic. "Head trauma: First aid." Emergency criteria including bleeding or fluid leakage from the nose or ears, worsening confusion or agitation, and change in consciousness.
8. Ling DA, Sung CW, Fang CC, et al. "High-Risk Return Visits to United States Emergency Departments, 2010-2018." Western Journal of Emergency Medicine. 2022. National Hospital Ambulatory Medical Care Survey data; 72-hour adult revisits fell from 5.1% of ED visits in 2010 to 4.5% in 2018.
9. Bilicki DJ, Reeves MJ. "Outpatient Follow-Up Visits to Reduce 30-Day All-Cause Readmissions for Heart Failure, COPD, Myocardial Infarction, and Stroke: A Systematic Review and Meta-Analysis." Preventing Chronic Disease. 2024. Pooled adjusted effect 0.79 (95% CI 0.69 to 0.91) with high between-study heterogeneity (I² = 92.7%).
10. "Outpatient Follow-Up and 30-Day Readmissions: A Systematic Review and Meta-Analysis." JAMA Network Open. 2025. 83 studies; follow-up within 30 days associated with lower 30-day readmission risk, with the benefit of 7-day and 14-day follow-up concentrated among patients 65 and older with heart failure or acute myocardial infarction.
11. "Associations Between Early Physician Follow-up and Post-discharge Outcomes: A Systematic Review and Meta-analysis." Journal of General Internal Medicine. 2025. doi:10.1007/s11606-024-09340-2. Concludes that early physician follow-up may be associated with reduced readmissions and mortality, and that the finding should be read with caution because most included studies were observational and at high risk of bias.
12. American College of Emergency Physicians. "Head Injury: Know When to Go to the ER." Patient-facing emergency criteria after head injury, including worsening headache despite over-the-counter medication, repeated vomiting, unequal pupils, and loss of consciousness.