Glucose Strips and Lancets: Storage, Expiry and Cost

How test strips work

A glucose strip is a thin plastic stick with a small chamber at one end that draws up a tiny drop of blood. Inside, chemicals including an enzyme react with glucose and generate a small electrical current. The meter measures this and converts it to a glucose number. The chemicals are sensitive to moisture, heat, light and air, which is why strips come in sealed vials with a desiccant in the cap, or in individual foil wraps. Strips are specific to a meter: do not use strips from one brand in another's meter. See glucometers: how to choose and use one.

Reading expiry dates

Strips have two dates to watch:

• The printed expiry date on the box and vial. Do not use strips after this date, as the chemistry may drift and give wrong results.
• The "use within" period after opening, which some makers state, often a few months. It is typically printed on the vial; write the date you first open it on the label so you remember. Not all brands have this rule, so follow the maker's instructions.

When you buy, check the expiry date and avoid packs with only a few weeks left unless your parent uses strips quickly. Buy from a reliable, high-turnover chemist rather than a shop that stocks them for months. Expired strips can sometimes give plausible numbers, which is what makes them dangerous.

Storing strips at home

• Keep strips in the original vial with the cap closed tightly immediately after taking a strip. Do not transfer strips to another container, a pillbox or a tin unless the maker says so.
• Store at room temperature in a dry, shaded place. Avoid the fridge, the freezer, the bathroom, the kitchen near the stove, sunny windowsills and hot cars or two-wheelers.
• Never leave the vial open during a test. Moisture enters within minutes in the monsoon.
• Do not touch the reaction end of the strip with wet or dirty fingers.
• Do not bend, cut or reuse strips.
• Keep the vial in a cool, dry box together with the meter and log book, with a silica gel packet outside the vial.
• During travel, keep strips in a hand bag inside an insulated pouch, not in a hot vehicle.

If a vial has been left open for a long time, or if the strips look discoloured or damaged, discard them.

Using control solution

Control solution contains a known amount of glucose. Testing it checks that the meter and strips are working together. Use it when you open a new vial, when the meter has been dropped, when readings seem odd or when the doctor asks you to check. If the result is outside the range printed on the vial, do not use that vial; see the maker's guide, and consider contacting the seller. Control solution has its own expiry date after opening.

How lancets work

A lancet is a small sterile needle with a plastic cap, loaded into a lancet device. The device fires the needle into the fingertip to a set depth and then retracts it. Different brands have different sizes, measured by gauge: higher numbers mean thinner needles, which usually hurt less. Many lancets are universal and fit most devices, but check your device. Lancets are single-use items by design.

Using lancets safely

• One lancet, one person. Never share a lancet device or lancets with another person, even a spouse, and even if you change the lancet. Devices can be contaminated by tiny amounts of blood. Hepatitis B, hepatitis C and HIV can be passed through shared devices. In a household where several people test, label devices clearly.
• Change the lancet every time if you can. Many people reuse lancets to save cost, which makes them blunt and increases pain and infection risk. If cost is a problem, talk to your doctor or nurse for a safe plan rather than reusing many times.
• Do not recap a used lancet with your fingers. Eject it straight into a sharps container.
• Wash hands before testing and keep a clean surface.
• Rotate fingers and sides to avoid sore, calloused tips.
• Use a depth setting that gets a good drop without deep pain. See how to test blood sugar at home step by step.

Safe disposal

Used lancets are sharps. They can hurt household staff, waste collectors and children. Good practice:

• Collect them in a hard, puncture-resistant container with a lid, such as a thick plastic bottle with a narrow opening or a purpose-made sharps bin.
• Label it "sharps" and keep it out of reach of children and pets.
• When it is about three-quarters full, close it tightly and ask your pharmacist, doctor or the nearest hospital how to dispose of it; many have a biomedical waste route. Do not throw loose lancets into household waste or recycling.
• Dispose of used strips in household waste, ideally in a sealed bag.

Cost and saving sensibly

Costs vary a lot between brands, pack sizes and places. Strips are usually the main expense. Sensible ways to manage:

• Ask the doctor how often your parent really needs to test; unneeded tests waste money and add stress.
• Compare cost per strip, not only pack price, and compare with meters whose strips are cheaper.
• Buy a pack size your parent will finish before expiry and before the open-vial limit.
• Check for reputable discounts, pharmacy schemes and approved government or hospital supply routes, without compromising on authenticity.
• Do not buy loose or repacked strips, strips sold cheaply in unmarked bundles or strips from street sellers.
• Never use "second-hand" strips passed on by others, as storage history is unknown.
• Keep a small reserve so that a delivery problem does not leave your parent without strips.

For wider budgeting, see health device budgets and quality checks in India.

Avoiding counterfeit or poor-quality strips

Counterfeit and repackaged strips exist. They can give false readings that lead to wrong decisions. To reduce risk:

• Buy from a licensed pharmacy or the maker's authorised seller.
• Check that the packaging is sealed, the print is clear, the batch number and expiry date are on both box and vial, and the maker's name and address are present.
• Compare a new vial with an old one for colour, text and quality.
• If the readings suddenly change when you start a new box, test the control solution and tell the pharmacist.
• Report suspicious products to the maker and to the pharmacy.

Storage in a shared Indian household

Strips and lancets should not be left on open shelves where children, grandchildren or domestic staff can pick them up. Keep a labelled box with a lid and a sharps bottle in a drawer. Avoid storing near the pooja area or the kitchen where steam and heat are strong. In the monsoon, check the box for damp; in summer, keep it away from sunlit windows. If there is a long power cut and a hot spell, move the box to the coolest room in the house.

Signs that strips are not working

• Frequent error messages.
• Readings that jump wildly between two tests a minute apart.
• Discoloured or sticky strips.
• Results inconsistent with how your parent feels.
• Failing control solution test.

If any of these occur, switch to a fresh vial from a new pack and call the seller. Do not rely on a meter that behaves strangely when decisions about food or medicines depend on it.

Special considerations for older adults

Older adults may have slower circulation and thicker skin, so lancets may need a slightly deeper setting. Arthritic hands may struggle with small strips, so choose strips that are easy to hold, or ask a helper. Those with reduced feeling in the fingers need to check fingertips for wounds. Those with memory difficulties should not have loose lancets lying about; a caregiver should supervise. See monitoring with poor eyesight or tremor.

When to ask a professional

Ask a pharmacist or diabetes educator about the right strips for your parent's meter, expiry rules and disposal in your area. Ask the doctor or nurse if your parent has repeated infections or sores at fingertip sites, severe pain with testing, or if readings are not consistent with lab tests. Call the doctor if a fingertip becomes red, swollen, hot or pus-filled. Call 112 for an emergency such as unresponsiveness or seizure.