At Acibadem, How to Prepare for Blood Tests, Scans, and Pre-Op Checks

Can you have breakfast before your blood test? What happens if your old scans are on a disc at home? Do you need to fast before a pre-op assessment, or only before the operation itself? These are the questions patients ask most often the night before an appointment. If you are coming to Acibadem for laboratory tests, imaging, or pre-operative checks, knowing how to prepare for blood tests, scans, and pre-op checks in advance makes the day noticeably smoother — and reduces the chance that a test has to be rebooked.

This guide explains what these checks are for, what to bring, which preparation rules genuinely vary from test to test, and what a typical testing day looks like for an international patient. It is general information, not personal medical advice: the instructions attached to your own appointment always take priority over anything written here.

Why blood tests, scans, and pre-op checks matter before treatment

Before any planned procedure, your care team needs a clear, current picture of your health. Blood tests can confirm details such as blood counts, clotting, kidney and liver function, blood sugar, and signs of infection. Imaging shows anatomy the surgeon needs to see. A pre-operative assessment brings this together and adds the questions that matter for anaesthesia: your medical history, previous operations, allergies, medications, and how you have responded to anaesthetic drugs in the past.

Even if you feel completely well, these checks still earn their place. They can surface practical issues that are far easier to handle before surgery than during it — a medication that needs timing adjustments, mild dehydration on a fasting day, or an imaging finding that a specialist wants to clarify first. Understanding how to prepare for blood tests, scans, and pre-op checks is therefore less about passing an exam and more about making sure nothing important is missing from your file.

What a pre-op work-up includes depends on your age, health, and the procedure planned. Commonly it involves a panel of blood tests, an ECG, sometimes a chest X-ray or other imaging, a urine test, and a consultation with an anaesthetist or another specialist. If you want a fuller picture of what may be requested, our separate guide to pre-op tests in Turkey for international patients goes through the typical components in more detail.

At Acibadem, these steps are usually coordinated for you. International patient services can help with scheduling, documentation, and same-day logistics across hospital departments, which matters when your laboratory, radiology, and consultation appointments all fall on the same day.

How to prepare in the days before your appointment

The single most useful step is unglamorous: read your appointment instructions carefully, and read them again the evening before. Some blood tests require fasting; many do not. Some scans need you to drink extra water or arrive with a full or empty bladder; others need nothing at all. A pre-op day may involve several stops — laboratory, ECG, radiology, anaesthesia consultation — each with its own timing. Guessing based on a previous test, or on general internet advice, is the most common reason a sample has to be redrawn.

Build a single folder. On paper or on your phone, keep together: your passport, appointment confirmation, a written list of diagnoses, allergies, and every medicine and supplement you take, plus your recent medical reports. If you have had imaging elsewhere, bring both the written report and the image files (a disc or a download link). Original images let radiologists compare old and new studies directly. Without them, some tests may need to be repeated — our guide on why blood tests and scans are sometimes repeated before treatment in Turkey explains when that happens and why.

Prepare a proper medication list. Include prescription medicines, over-the-counter tablets, vitamins, herbal products, injections, inhalers, patches, and creams, with doses and when you last took each one. Blood thinners and diabetes medicines are particularly important for the team to know about, because they can affect how tests and procedures are timed. There is a step-by-step template in our guide to preparing a medication list for treatment in Turkey.

Dress and pack for the format of the day. Wear clothing that is easy to remove, with sleeves that roll up past the elbow for blood draws. Leave heavy jewellery and metal accessories at home if a scan is planned. Pack water, a small snack for after any fasting period ends, a phone charger, reading glasses or hearing aids if you use them, and your regular medicines in their original packaging. Practical detail on clothing, fasting, and timing is covered in our broader guide on how to prepare for medical tests in Turkey.

Fasting, medications, and what to tell your care team

Fasting: it depends on the test, not on a general rule

Some blood tests — commonly those measuring blood sugar or blood fats — require fasting for a set number of hours, and your instructions will state the exact window. Many other blood tests need no fasting at all. Scans vary too: some require nothing, some require an empty stomach, and some contrast studies come with their own food and fluid rules. Anaesthesia carries the strictest requirements: before a procedure under sedation or general anaesthetic, you will be told precisely when to stop eating and when to stop drinking, and those two cut-off times are often different.

Because the rules differ, follow the guidance for your specific test rather than a rule remembered from a previous appointment. If several tests fall on the same day, ask before eating or drinking anything between them — one department’s “you can eat now” may not apply to the next test on your list. If fasting is required, water is often still allowed unless your instructions say otherwise, but confirm rather than assume. For planning food around a testing day, see our guide on how to plan meals around tests, scans, and procedures in Turkey.

The night before: what genuinely helps

If you have a fasting blood test in the morning, the evening before is when preparation actually happens. Finish eating before your fasting window begins, avoid alcohol, and avoid an unusually heavy or fatty late meal, which can affect some results even outside the formal fasting period. Strenuous, unaccustomed exercise the night before can also influence certain blood values, so keep the evening ordinary. Go to bed at a reasonable hour — a rested patient with normal hydration gives a more representative sample and an easier blood draw.

Small comforts are usually fine. Brushing your teeth before a fasting blood test is generally acceptable, since it does not meaningfully affect standard laboratory results. Before anaesthesia the fluid rules are stricter, so follow the exact instructions you were given about what may pass your lips and when.

Medications: inform, don’t improvise

Tell your care team about everything you take — including supplements and herbal products, which patients often leave off because they do not think of them as medicines. Do not stop, skip, or change any prescribed medicine on your own before a test or a pre-op check. Whether a particular medicine should be taken as usual, moved, or paused is a decision for the treating doctor, and it depends on the medicine, the test, and the procedure planned. Your job is simpler: make sure the team knows what you take and when you last took it.

What else to mention

Some details change how a test is planned, so raise them early rather than on the table: possible pregnancy or breastfeeding, implanted devices such as pacemakers or metal implants, previous reactions to contrast dye or anaesthesia, kidney problems, claustrophobia, recent illness or fever, and any past difficulty with blood draws. None of these is unusual, and none is a problem to mention — they are exactly the information the team is asking for. If English is not your first language, interpreters can help make sure nothing is lost.

What to expect on the day: blood tests, scans, and pre-op clearance

On arrival you will check in, confirm your identity, and review your appointment details. For international patients this may include passport verification, insurance or payment paperwork, and coordination through the international patient desk. Arriving early gives you time for this without rushing — and if a fasting blood draw is on your list, an early slot means you finish fasting sooner.

The blood test is usually the quickest station of the day: a short wait, identity confirmation, the draw itself, and a moment of pressure on the puncture site. Imaging takes longer, and how long depends on the modality — an X-ray is brief, while MRI studies take considerably more time and involve changing clothes, removing metal, and sometimes contrast injection. Staff will explain each step; our dedicated guide to MRI and CT scans in Turkey walks through what happens inside the scanner room.

The pre-op assessment is mostly conversation and simple measurements. You will answer questions about your health history, previous operations, medications, allergies, and fasting status, and you may have an ECG and other baseline checks. The questions are not there to catch you out. Incomplete answers help no one; complete answers let the anaesthesia team plan around your actual body rather than an idealised one.

• Carry your ID and appointment confirmation to each department if requested
• Keep your phone accessible in case your coordinator updates the day’s timing
• Ask before eating, drinking, or taking anything if multiple tests share the day
• Tell staff promptly if you feel faint, anxious, or unwell during any test

Practical tips for international patients in Istanbul or elsewhere in Turkey

Build flexibility into your schedule. Even a well-planned testing day can grow: a specialist may want one additional check, or a result may need same-day repetition. Avoid booking tight sightseeing plans or immediate onward travel around a testing day, and especially around the days before surgery. A loose schedule costs you nothing; a tight one can cost you a rebooked procedure.

Know which hospital campus you are visiting — Acibadem operates multiple hospitals, and departments are not always in the same building. Save the hospital address and your coordinator’s contact details in your phone, ideally in both English and Turkish so a taxi driver can read them. If a companion is travelling with you, make sure they know your itinerary and your fasting rules, so a well-meant breakfast does not undo a fasting window.

Keep your essentials on your person rather than in checked or stored luggage: passport, charger, glasses, hearing aids, regular medicines, and a written emergency contact. If you have an implanted device, carry its documentation with you throughout the trip.

After the checks: results, next steps, and avoiding delays

Results arrive at different speeds. Some laboratory values are available quickly; others take longer or need specialist interpretation. Imaging almost always needs a formal radiologist’s report before decisions are made from it. Pre-op clearance is a jigsaw — it is only complete when every requested piece is in place, which is why one pending result can hold up an otherwise finished assessment.

If something unexpected appears, resist the urge to assume the worst. A repeated sample, a second opinion, or a short delay usually means the team wants certainty before proceeding — a planning step, not a verdict. Abnormal-looking values are sometimes explained by fasting status, hydration, recent illness, or timing of medication, which is exactly why those details are asked about beforehand.

Before you leave, make sure your next instruction is unambiguous. Confirm when you may eat and drink, what to do about your usual medicines (as directed by the treating doctor, not by memory), what time to return, and how results will reach you. If you will complete some follow-up testing at home, agree on which tests, on what schedule, and how the reports should be shared.