Pedia-Devices

What Are Lancets?

A lancet is a small, sharp medical device designed to puncture the skin and obtain a small blood sample. These devices are commonly used for blood glucose testing in children with diabetes, newborn screening tests, and various other diagnostic procedures that require capillary blood samples.

Lancets have revolutionized blood sampling by making the process quick, minimally invasive, and relatively painless compared to traditional needle sticks. They are designed to create a precise puncture at a controlled depth, minimizing discomfort while ensuring adequate blood flow for testing.

Brief History of Lancets

The word "lancet" comes from the Old French word "lancette," meaning a small lance. Historically, lancets were small surgical blades used by physicians for bloodletting and minor procedures. These early versions were manual, double-edged blades that required steady hands and considerable skill to use safely.

The modern lancet evolved significantly in the late 20th century with the rise of home blood glucose monitoring for diabetes management. The introduction of spring-loaded, automatic lancet devices in the 1980s marked a major advancement, making blood sampling safer, more consistent, and accessible for home use. Today's lancets incorporate safety features like automatic retraction and controlled depth settings, reflecting decades of engineering improvements focused on reducing pain, preventing needlestick injuries, and ensuring sterility.

Purpose and Medical Uses

Lancets serve several important purposes in pediatric healthcare:

Blood Glucose Monitoring: Regular testing for children with diabetes mellitus (Type 1 or Type 2)
Newborn Screening: Heel stick blood collection for screening genetic and metabolic disorders
Complete Blood Count Testing: Obtaining small blood samples for hemoglobin, hematocrit checks
Blood Typing: Determining ABO and Rh blood groups
Diagnostic Testing: Various laboratory tests requiring capillary blood samples
Cholesterol Screening: Point-of-care lipid profile testing

Where Are Lancets Used?

Lancets are used in hospitals, clinics, doctors' offices, schools (for diabetic children), and most commonly in home settings for daily diabetes management and monitoring.

Types of Lancets

1. Standard Manual Lancets

Simple, single-use steel blades or needles that require manual application. These are the most basic and economical type but require more skill to use properly.

2. Spring-Loaded Safety Lancets

Automatic devices that use a spring mechanism to quickly puncture the skin at a controlled depth. These are the most popular type for home use and feature automatic needle retraction for safety.

3. Adjustable Depth Lancets

Devices with multiple depth settings that allow customization based on skin thickness, age, and testing requirements. Particularly useful for children with different needs.

4. Heel Stick Lancets (Neonatal)

Specially designed for newborns and young infants. These create a controlled incision on the heel and are calibrated to safe depths to avoid bone injury.

5. Contact-Activated Lancets

These lancets activate only when pressed firmly against the skin, ensuring consistent puncture depth and reducing user error.

Lancet Type	Best For	Key Feature
Manual Lancet	Healthcare settings	Simple, cost-effective
Safety Lancet	Home use, diabetes	Auto-retraction, safety
Adjustable Lancet	Multiple users, children	Customizable depth
Heel Stick Device	Newborns, infants	Controlled heel incision
Contact-Activated	Consistent results	Pressure-activated

Understanding Lancet Gauges

Lancet needles are measured in gauges, which indicates the thickness of the needle. Understanding gauge numbers is important for selecting the right lancet:

Important: For children, higher gauge numbers (30G-33G) are generally preferred as they create smaller punctures and cause less discomfort. Always consult with your healthcare provider about the appropriate gauge for your child.

How to Use Lancets: Step-by-Step Guide

For Finger Stick Blood Sampling

1Wash Hands Thoroughly

Clean your hands and the child's hands with soap and warm water. Dry completely. Moisture can dilute the blood sample.

2Prepare Equipment

Gather all necessary supplies: lancet device, test strips (if needed), alcohol swabs, gauze or cotton, and sharps container.

3Clean the Testing Site

Use an alcohol swab to clean the side of the fingertip. Allow to air dry completely before proceeding.

4Load the Lancet

Insert a new, sterile lancet into the lancing device according to manufacturer instructions. Remove the protective cap from the lancet.

5Set the Depth

If using an adjustable device, set the appropriate depth. For children, start with a shallower setting and adjust if needed.

6Position and Puncture

Place the device firmly against the side of the fingertip (not the pad). Press the release button. The lancet will make a quick puncture.

7Wipe Away First Drop

Use clean gauze to wipe away the first drop of blood, as it may contain tissue fluid that could affect test results.

8Collect the Sample

Gently squeeze the finger to form a blood drop. Touch the test strip to the blood drop (do not scrape the skin).

9Apply Pressure

Use clean gauze or cotton to apply gentle pressure to the puncture site until bleeding stops.

10Dispose Safely

Immediately dispose of the used lancet in a sharps container. Never reuse lancets.

Tip for Children: Test on the sides of fingertips, not the sensitive pads. Alternate fingers to prevent soreness. Warm hands increase blood flow and make testing easier.

For Newborn Heel Stick (Healthcare Providers)

1Verify Patient Identity

Confirm the infant's identity using two identifiers (ID band, parent verification).

2Warm the Heel

Apply a warm compress or chemical heel warmer for 3-5 minutes to increase blood flow. Ensure temperature does not exceed 42 degrees Celsius.

3Select Safe Puncture Site

Use only the medial and lateral plantar aspects of the heel. Avoid the center arch and posterior curve to prevent bone injury.

4Clean the Site

Clean with alcohol and allow to air dry completely.

5Use Appropriate Lancet

Infants under 1 kg: 0.65 mm depth
Premature infants over 1 kg: 0.85 mm depth
Term infants up to 6 months: 1.0 mm depth (maximum 2.0 mm)

6Perform Puncture

Hold the heel firmly but gently. Place the lancet device perpendicular to the skin and activate.

7Collect Sample

Wipe away the first drop. Apply gentle pressure to produce blood drops. Avoid excessive squeezing or milking.

8Stop Bleeding

Elevate the foot and apply gentle pressure with sterile gauze until bleeding stops.

Critical Safety Note: Never puncture the center of the heel or posterior curve. The heel bone (calcaneus) in newborns can be as shallow as 2 mm beneath the skin surface. Improper technique can cause bone infection (osteomyelitis) or permanent injury.

Precautions and Safety Measures

General Precautions

Always use a new, sterile lancet for each test
Never share lancets between individuals due to infection risk
Store lancets in a cool, dry place away from direct sunlight
Check expiration dates before use
Keep lancets and lancing devices out of reach of young children
Ensure proper hand hygiene before and after testing
Use appropriate depth settings for the child's age and skin thickness

Special Considerations for Children

Choose higher gauge (thinner) lancets to minimize discomfort
Rotate testing sites to prevent callus formation and soreness
Test on the sides of fingers, not the sensitive pads
For infants, heel sticks should not be performed after 8-12 months when they begin walking
Never perform finger sticks on newborns due to shallow bone depth
Avoid testing on fingers or toes with cuts, infections, or swelling

Infection Prevention

Clean testing site with alcohol and allow to dry
Use only single-use, sterile lancets
Dispose of used lancets immediately in proper sharps containers
Watch for signs of infection at puncture sites (redness, swelling, warmth, pus)
Avoid puncturing previous test sites

Dangers and Complications:

Needlestick Injury: Accidental puncture from improper handling or disposal
Infection: Can occur with poor hygiene or reusing lancets
Bone Injury: In infants, improper heel stick technique can damage bone
Excessive Bleeding: May occur in children with bleeding disorders
Nerve Damage: Rare but possible with repeated testing in the same area
Hemolysis: Excessive squeezing can rupture blood cells and affect test results

Safe Storage and Handling

Storage Guidelines

Store lancets in their original packaging until use
Keep in a cool, dry environment (room temperature)
Avoid exposure to extreme temperatures, humidity, or direct sunlight
Store lancing devices in clean, protective cases when not in use
Check expiration dates regularly and discard expired lancets
Keep away from children and pets when not supervised

Proper Disposal

Important: Used lancets are considered medical sharps and must be disposed of properly to prevent injury and infection.

Use an FDA-approved sharps container (rigid, puncture-proof container with lid)
Never dispose of lancets in regular household trash
Do not recap or bend lancets before disposal
When sharps container is three-quarters full, seal and follow local disposal regulations
Many pharmacies and healthcare facilities offer sharps disposal programs
Never flush lancets down the toilet

Popular Brands and Approximate Costs

Several reputable manufacturers produce lancets with varying features and price points. Prices can vary by region, retailer, and quantity purchased.

Note: Prices are approximate and may vary by location, retailer, insurance coverage, and bulk purchase options. Many brands offer samples through healthcare providers. Check with your insurance provider as many diabetes supplies including lancets may be covered.

Frequently Asked Questions

Q: How often should lancets be changed?

Every single use. Lancets should never be reused, even by the same person. Reusing lancets increases infection risk, causes more pain due to dullness, and can lead to inaccurate test results.

Q: Which gauge is best for children?

For children, 30G to 33G lancets are generally recommended as they are thinner and cause less discomfort. Consult your pediatrician for specific recommendations based on your child's age and testing needs.

Q: Why should the first drop of blood be wiped away?

The first drop may contain excess tissue fluid, which can dilute the blood sample and affect test accuracy. Always wipe it away with clean gauze before collecting the sample.

Q: Can lancets be used on any part of the body?

Lancets are primarily designed for fingertips in older children and adults. For newborns and young infants, heel sticks are used. Alternative sites like forearms may be used in some cases, but finger sticks generally provide the most accurate results. Always follow healthcare provider recommendations.

Q: How can I make blood sampling less painful for my child?

Use higher gauge lancets (thinner), test on the sides of fingers (not pads), warm hands before testing, use shallow depth settings, rotate testing sites, and ensure the alcohol has completely dried before puncturing.

Q: What should I do if bleeding won't stop after using a lancet?

Apply continuous gentle pressure with clean gauze for several minutes. Elevate the hand or foot above heart level. If bleeding continues beyond 10 minutes or if your child has a known bleeding disorder, contact your healthcare provider.

Q: Are lancets safe for newborn screening tests?

Yes, when performed correctly by trained healthcare professionals using appropriate neonatal lancets with proper depth limitations. These specialized devices are designed specifically for newborn heel sticks.

Q: Can I use expired lancets?

No. Expired lancets may not be sterile, and the blade may become dull or corroded, increasing pain and infection risk. Always check expiration dates and discard expired lancets.

Q: Do lancets work with all blood glucose meters?

Most standard lancets work with various lancing devices. However, some brands like Accu-Chek FastClix use proprietary lancets. Check compatibility before purchasing.

Q: What if I accidentally stick myself with a used lancet?

Immediately wash the area with soap and water. If the lancet was used on another person, contact your healthcare provider as post-exposure testing may be needed for blood-borne pathogens.

When to Contact Your Healthcare Provider

Signs of infection at puncture sites (redness, swelling, warmth, discharge)
Excessive or prolonged bleeding after lancet use
Unusual pain or sensitivity at testing sites
Difficulty obtaining adequate blood samples consistently
Questions about appropriate lancet gauge or depth settings for your child
Concerns about blood glucose readings or testing technique
Accidental needlestick with another person's used lancet

Additional Resources

For more detailed information about lancets and blood sampling techniques, consider these resources:

Clinical and Laboratory Standards Institute (CLSI): Guidelines for capillary blood sampling
American Diabetes Association: Resources for diabetes management and testing
Manufacturer Instructions: Always read the package insert included with your lancet device
Your Pediatrician or Diabetes Educator: Personalized guidance for your child's specific needs
World Health Organization (WHO): Best practices in phlebotomy and blood collection

Key Takeaways

Lancets are small, sharp devices used to obtain capillary blood samples safely and efficiently
Different types exist for various purposes, including standard finger sticks and specialized neonatal heel sticks
Always use a new, sterile lancet for each test to prevent infection and ensure accuracy
Proper technique minimizes discomfort and provides reliable blood samples
Higher gauge numbers mean thinner needles and less pain for children
Safe disposal in sharps containers is mandatory for used lancets
Consult healthcare providers for personalized guidance on lancet selection and technique

Medical Device Guides

Lancets: Complete Guide to Safe Blood Sampling Devices for Children