Health Checkup Eligibility Inquiry and Fasting Water Consumption Guidelines

Introduction: “Am I a Health Checkup Target This Year?” and Common Questions About Fasting

Whenever you receive the health checkup notification letter arriving in your mailbox or as the end of the year approaches, you find yourself tilting your head and thinking, “Ah, was I a target for a health checkup this year?” Especially for office workers, it is easy to casually pass by the checkup notices sent from work, and local subscribers or dependents often get confused about whether this year is indeed their target checkup year.
If you put things off thinking, “Surely it’ll be fine to skip this year,” the year changes before you know it, causing you to miss out on benefits or face frustration due to exploding reservations at year-end.
Moreover, once you manage to schedule your dates, you run into yet another obstacle. That is fasting, which starts from the night before the checkup. You must have debated dozens of times whether or not to drink water, unable to endure the thirst while thinking, “My examination is tomorrow morning, my throat is so dry, wouldn’t just a sip of water really be fine?”
So exactly how can we check our precise health checkup eligibility for this year, and to what extent is drinking water permitted during the fasting hours before a checkup? In this post, we will carefully walk you through everything from how to check your eligibility to the exact standards of water intake during fasting, so stop feeling anxious and follow along until the end!

How to Check Health Checkup Eligibility via the National Health Insurance Service Website and App

Checking whether you are eligible for a national health checkup this year is much simpler than you think. Choose whichever method is more comfortable for you between PC and smartphone, and check according to the steps below.

1. PC Inquiry Method Using the National Health Insurance Service Website

Official Website Access: Search for ‘National Health Insurance Service’ on a portal site and access the official website.
Proceed with Login: Click the [Login] button at the top and complete identity verification through a joint certificate, financial certificate, or simple authentication (Kakao, Naver, Toss, etc.).
Navigate to Health Checkup Target Inquiry Menu: Enter the main screen or the ‘Health Story’ ➔ ‘Health Checkup’ menu, then click the ‘Health Checkup Target Inquiry’ corner.
Check Results: You can check in detail by item whether you are eligible for this year’s general health checkup, cancer screenings (stomach cancer, colorectal cancer, breast cancer, etc.), or infant checkups.

1. Mobile Inquiry Method Using the Smartphone App (‘The Health Insurance’)

App Execution and Simple Login: Run the ‘The Health Insurance’ app installed on your smartphone and log in via simple authentication. (If you don’t have the app, you can download it for free from the Google Play Store or App Store.)
Select the ‘Health Checkup’ Menu: Touch the ‘Health Checkup’ or ‘Inquiry/Application’ related menu on the app’s main screen.
Instant Eligibility Check: The screen will display in real-time whether you are eligible for a health checkup this year, along with which checkup items you haven’t received yet.
If you have confirmed through PC or mobile inquiry that you are eligible this year, it is a good idea to carefully check the target items and checkup sheet details. Well, now that you’ve finished checking your eligibility, shall we look into the ‘fasting and water intake criteria’ that are most confusing before a checkup in detail?

Exact Criteria and Reasons for Fasting Time Before Health Checkup

Once you have finished booking your health checkup, the next thing you must strictly follow is fasting (maintaining an empty stomach). It is easy to take it lightly thinking, “Surely eating a little bit for a few hours won’t change the results that much?”, but in order to obtain accurate test results, you must strictly observe the fasting time and guidelines.

1. Exact Criteria for Fasting Time Before Checkup

General Fasting Time: Usually, you must maintain an empty stomach for at least 8 hours to 12 hours or more based on the scheduled checkup time.
Tips by Time Zone: In the case of a morning checkup, the rule is to stop all intake of not only food but also water, coffee, snacks, gum, cigarettes, etc., from after 9 PM the previous day. (If it is an afternoon checkup, you must start fasting from midnight the previous day or early in the morning on the day of the checkup to fulfill the required time.)

1. Clear Reasons Why Strict Fasting is Essential

Prevention of Blood Test Result Distortion: If you eat food or drink beverages, blood glucose and triglyceride levels in the blood rise sharply. If you draw blood in this state, it is difficult to accurately diagnose diabetes or determine the presence of hyperlipidemia.
Securing Accuracy of Gastrointestinal and Abdominal Ultrasound: If food or digestive juices remain in the stomach during a gastroscopy or gastrointestinal X-ray examination, the mucosa cannot be properly observed, making accurate diagnosis impossible. In addition, during an abdominal ultrasound examination, gas or food in the stomach can obscure major organs such as the liver, gallbladder, and pancreas, causing minute lesions to be missed.
Proper fasting is the most fundamental key to bringing out accurate checkup results. Then, up to what point is drinking water permitted when you feel thirsty before a checkup? Let’s check the clear criteria in the next chapter!

“Really, Not Even a Sip of Water?” Permitted Range of Drinking Water During Fasting

One of the hardest things to endure during the fasting hours starting from the night before a health checkup is thirst. When your mouth is parched and burning up, you repeatedly pick up and put down your cup thinking, “Can I really not even drink a single sip of water?” We will carefully outline the clear permissible range of water intake during fasting.

1. Exceptional Water Intake Criteria in Case of Severe Thirst Just Before the Examination

Allowance of a Very Small Amount of Plain Water: When your throat is extremely dry or your mouth is parched on the morning of the examination and you can barely endure it, taking a very small amount of plain water—about half a paper cup (less than about 100ml)—slightly to moisten your throat without swallowing is often not a major issue.
Medical Staff Guidance Priority: However, if a gastroscopy, sleep examination, or certain precision blood tests are scheduled, the fasting guidelines guided by each hospital may vary, so it is safest to follow the hospital’s prior guidance as much as possible.

1. Water Intake Tips When Taking Diabetes or Blood Pressure Medications

If you have essential medications that you must take every day, such as diabetes or blood pressure medications, swallowing the medication with a minimal amount of water (one or two sips) on the morning of the checkup is mostly permitted.
However, in the case of diabetes medications, taking them on an empty stomach may pose a risk of hypoglycemia, so it is essential to check in advance with your attending physician or the checkup center before the checkup on whether you should take the medication.

1. Types of Beverages That Must Never Be Consumed

Prohibition of All Beverages Except Plain Water: Even if it is water, coffee, green tea, tea, milk, sports drinks, juices, or carbonated beverages mixed with sugar, syrup, milk, cream, etc., are strictly prohibited.
The sugars, colorings, and additives contained in these beverages stimulate gastric juice secretion or distort blood sugar and blood lipid levels, becoming the main culprits that completely ruin test results.
Drinking sweet beverages or tea just because you are thirsty is strictly forbidden, and if you really want to drink plain water, you need the wisdom to endure it by just slightly moistening your throat with a very small amount. Try preparing for your checkup accurately and safely by following the correct hydration criteria!

Conclusion and Summary: Successful Health Checkups Through Thorough Target Verification and Proper Fasting

We have thoroughly reviewed everything from how to easily and quickly check if you are eligible for this year’s health checkup using the National Health Insurance Service website and smartphone app, to the criteria for exact fasting times and allowable limits for drinking water to obtain accurate checkup results.
Shall we neatly summarize today’s key points in three lines?
First, you can accurately check whether you are eligible for this year’s general checkup and cancer screening in just one minute through simple authentication on the PC National Health Insurance Service website or the mobile ‘The Health Insurance’ app.
Second, maintaining a strict empty stomach starting from 9 PM the night before the checkup (or 8 to 12 hours or more before the checkup) is the most critical condition for increasing the accuracy of blood tests and precision gastrointestinal examinations.
Third, drinking a very small amount of plain water (less than half a paper cup) to moisten your throat in case of extreme thirst is exceptionally permitted, but sugary drinks, tea, or coffee are strictly prohibited.
If you delay by thinking “Surely I must be eligible” or let your guard down thinking “I’m thirsty, so this much should be fine,” you may end up facing the disappointment of having to retake tests or cancel your reservation on the day of the checkup.
Checking your eligibility in advance and strictly following proper fasting guidelines is the wisest shortcut to protecting your precious health. That is all for the content prepared today. Thank you for reading, and we wish you peaceful and healthy days ahead! 😊