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A Step-by-Step Guide to Checking Your Blood Sugar Level Correctly

04 Sep 2025 by Simon J. Laplante, M.D.

A Step-by-Step Guide to Checking Your Blood Sugar Level Correctly

Checking your blood sugar level is a vital part of managing diabetes or prediabetes. Accurate readings allow you to make informed decisions about your diet, exercise, and medication. However, a faulty reading can lead to incorrect assumptions and potentially harmful decisions. This guide provides a step-by-step approach to ensure accurate results every time. The Definitive Guide To Interpreting Any Blood Sugar Scenario

Gathering Your Supplies

Before you even touch your finger, make sure you have everything you need:

  • Glucose Meter: This is the device that reads your blood sugar level.
  • Test Strips: These are specific to your meter – always check the expiration date.
  • Lancing Device (Finger Pricker): This helps draw a small blood sample.
  • Lancet: A small needle used with the lancing device – change these frequently!
  • Alcohol Wipe or Soap and Water: For cleaning your finger.
  • Clean, Dry Towel or Paper Towel: To dry your finger.
  • Sharps Container: For safe disposal of used lancets and test strips.

Step 1: Preparing Your Finger

Proper preparation is critical for accurate readings.

  • Wash Your Hands: Thoroughly wash your hands with warm water and soap. This removes any residue that could interfere with the reading. Dry your hands completely with a clean towel.
  • Choose a Finger: The sides of your fingertips are less sensitive and generally provide better blood flow. Rotate fingers to avoid soreness.
  • Clean the Puncture Site: Use an alcohol wipe to clean the chosen fingertip. Allow the alcohol to dry completely – this is very important! Wet alcohol can dilute the blood sample and give a false reading. Alternatively, use soap and water and thoroughly dry your finger.

Step 2: Using the Lancing Device

This step is all about getting a good blood drop.

  • Adjust the Depth Setting: Adjust the lancing device depth setting based on your skin thickness and the meter's instructions. Start with a lower setting and increase if needed.
  • Load the Lancet: Insert a new lancet into the lancing device according to the device’s instructions.
  • Prick Your Finger: Place the lancing device firmly against the cleaned fingertip and press the release button to prick your finger.

Step 3: Obtaining a Blood Sample

A sufficient blood drop is essential for an accurate reading.

  • Allow Bleeding: Gently massage your finger from the base toward the puncture site to encourage blood flow. Avoid squeezing too hard, as this can affect the results.
  • Observe the Drop: Allow a large enough drop of blood to form – usually about the size of a nickel.

Step 4: Using the Glucose Meter

Now it’s time to read the blood sugar level.

  • Insert the Test Strip: Insert a test strip into the glucose meter. The meter should display a signal indicating it's ready for the blood sample.
  • Apply the Blood Drop: Carefully touch the edge of the test strip to the blood drop. Don't smear the blood; let the strip draw the sample.
  • Wait for the Reading: The meter will begin processing the sample and display your blood sugar level within a few seconds.

Step 5: Post-Reading and Disposal

Complete the process with safety and hygiene in mind.

  • Record the Reading: Write down the reading, the date, and the time. This helps track your blood sugar trends.
  • Clean Your Finger: Use a clean tissue or paper towel to gently clean the puncture site.
  • Dispose of Materials Safely: Immediately dispose of the used lancet and test strip in a sharps container. Never throw them in the regular trash.
  • Eject and Clean the Meter: Follow the meter's instructions for ejecting the used test strip and cleaning the meter.

Troubleshooting Common Issues

  • Insufficient Blood Sample: Increase the lancing device depth setting or try a different finger.
  • Error Message on Meter: Consult the meter's user manual for troubleshooting steps.
  • Unexpectedly High or Low Reading: Retest with a new test strip. If the problem persists, consult your healthcare provider.
  • Painful Puncture: Adjust the lancing device depth setting and try a different finger.

Disclaimer: This guide provides general information and should not be considered medical advice. Always consult with your healthcare provider for personalized guidance on managing your health. Common Mistakes That Spike Your Blood Sugar After Meals

References and Further Reading