Before you spend time on a screening visit
A screening call should answer basic fit questions before you drive to a site or send records. Ask the coordinator to separate three things: pre-screening, screening, and enrollment. Pre-screening is usually a phone call or web form. Screening is the formal review after consent. Enrollment usually happens only after the study confirms that your labs, history, medications, and schedule match the protocol.
Write down the site name, study title, NCT number if one is available, coordinator name, direct phone number, and the date of the call. Then ask what must be true for you to qualify. Good answers usually include age range, condition or healthy-volunteer status, medication rules, recent procedures, pregnancy-related rules, lab ranges, and recent research participation limits.
- Ask whether the first visit is screening only or whether enrollment can happen the same day.
- Ask whether screening is paid if you do not qualify.
- Ask whether fasting, medication holds, caffeine limits, nicotine limits, exercise limits, or alcohol limits apply before the visit.
- Ask how long the visit usually takes from check-in to leaving the building.
- Ask when you will know whether you qualify and who will contact you.
Information to prepare before the call
Most screening delays come from missing information. A coordinator may not need records during the first call, but they will usually need enough detail to see whether formal screening is worth scheduling. Keep the list factual. Do not guess at diagnoses, medication doses, or dates.
| Item | What to write down | Question to ask |
|---|---|---|
| Medications | Name, dose, frequency, start date, recent dose changes, over-the-counter drugs, supplements if relevant. | Are any of these prohibited, or do any require a washout period? |
| Recent medical events | Hospital visits, infections, procedures, imaging, abnormal labs, new diagnoses, and emergency care. | Does the study use a 30-day, 90-day, 6-month, or 1-year lookback window? |
| Other studies | Study name if known, last dose or procedure date, last visit date, and whether an investigational product was used. | How long must I wait after another study before screening? |
| Schedule limits | Work hours, school pickup, transportation limits, travel plans, and days you cannot attend. | Which visits have strict windows, and which can move? |
| Records | Doctor name, clinic, relevant reports, lab dates, vaccination or test records if requested. | Do you need records before screening, and how should they be sent securely? |
Eligibility rules that commonly surprise people
Screening criteria can be narrower than the listing suggests. A public listing may say “healthy volunteers” or “adults with asthma,” while the protocol may exclude people based on blood pressure, ECG findings, body mass index, recent medication changes, contraception requirements, sleep schedule, tobacco use, lab values, or recent participation in another trial.
Ask for the common screen-fail reasons before scheduling. Coordinators often know which rules remove the most people. A site may not be able to give every detail over the phone, but it can usually tell you whether medications, lab findings, recent research participation, and schedules can affect eligibility.
- Ask whether any current medication automatically excludes you.
- Ask whether supplements, cannabis, nicotine, alcohol, caffeine, or exercise restrictions apply.
- Ask whether body weight, BMI, blood pressure, ECG, kidney function, liver enzymes, pregnancy testing, or urine drug testing are part of screening.
- Ask whether recent vaccines, infections, surgeries, dental procedures, or hospital visits matter.
- Ask whether the study requires a stable medication dose for a specific number of weeks or months.
- Ask whether travel, overnight stays, or strict visit windows can affect eligibility after screening.
What formal screening may include
Formal screening can feel like a clinic visit, but the sequence is controlled by the study protocol. The site may review consent first, then collect medical history, vitals, blood, urine, ECG, questionnaires, physical measurements, device readings, or records. Some studies include cognitive testing, breathing tests, imaging, stool or saliva samples, or review by the principal investigator before a decision is made.
Ask what happens during the visit and what happens afterward. A person can complete every screening task and still not qualify because labs return outside range, records conflict with the protocol, the investigator has a safety concern, or the study reaches its enrollment limit.
- Ask whether you may eat, drink coffee, take regular medications, or exercise before screening.
- Ask whether the visit includes blood draw, urine test, ECG, pregnancy test, questionnaires, physical exam, or records release.
- Ask whether any test results will be shared with you.
- Ask whether abnormal results are reviewed by a clinician at the site and how urgent findings are communicated.
- Ask whether the screening visit creates a medical record, research record, or both.
Screening payment and costs
Do not assume a screening visit is paid. Some studies pay for screening, some pay only if you enroll, and some reimburse only certain costs. Before scheduling, ask whether screening compensation is separate from study compensation. Also ask whether parking, mileage, ride-share, tolls, meals, or hotel stays are reimbursed for screening visits.
Get timing in plain terms. “You will be compensated” is less useful than “screening pays $75, loaded to a debit card within 10 business days whether or not you qualify.” Ask whether tax forms may be issued and whether payment cards have fees or transfer limits.
When to pause before continuing
Pause if a recruiter pushes for records before identifying the site, refuses to provide the study title or NCT number, cannot explain whether screening is paid, gives different answers about visit length, or asks you to click a portal link before you can verify the organization. A legitimate site should be able to slow down and explain the next step.
Also pause if the schedule already looks fragile. A study with weekly fasting morning visits may be a poor match for night work, childcare, long drives, winter roads, or unreliable transportation. It is better to decide that before formal screening than after you are enrolled and expected to meet visit windows.
How to handle uncertain answers
If you are unsure about a diagnosis, procedure date, medication dose, or lab result, say so. Guessing can waste a screening visit or create a record that has to be corrected later. Use plain language: “I think the dose is 10 mg, but I need to confirm,” or “I had labs this spring, but I do not know the result.”
Ask whether the site wants you to confirm details before scheduling. Some sites can proceed with an estimated answer and verify later. Others need exact dates or records before they can decide. If records are needed, ask for the narrowest record request possible. Sending an entire medical chart is usually unnecessary for an early eligibility review.
After screening, get the next step before you leave
Before leaving a screening visit, confirm what is still pending. Ask whether labs, investigator review, records, pregnancy testing, ECG review, or sponsor approval must happen before enrollment. Ask when the site expects the decision and whether you should avoid new medications, vaccines, supplements, alcohol, tobacco, exercise changes, or another study while waiting.
Also ask what to do if your schedule changes before enrollment. If the study uses tight windows, a work trip or family obligation between screening and baseline may change your fit. Keep the coordinator updated before the next visit rather than waiting until check-in.