How to Know If Your Diabetic Test Strips Are Still Good

Test strips are still good if the box is sealed, the expiration date has not passed, and the cardboard is undamaged. Those three checks cover most situations. The edge cases come down to storage and condition details, and most of them resolve quickly with a photo.

The expiration date is the one hard cutoff

The date printed on the box is non-negotiable. Expired strips are a hard no, regardless of how well they were stored or how clean the box looks. The enzymes that react to blood glucose degrade over time, which is why manufacturers publish an expiration date. The FDA advises against using test strips past the labeled expiration date because accuracy cannot be guaranteed once the chemistry has degraded. Past that date, we cannot take them.

For strips still ahead of today, dating affects value, not eligibility. Strips with 9+ months before expiration get the full rate. Strips with 3 to 8 months remaining we price case-by-case. Text a photo and we will give you the exact number. CGM sensors run on a different timeline: 7+ months before expiration for full rate, with shorter runway priced separately.

The date on the box is the expiration date of the strips inside, not a "sell by" cutoff we negotiate around. Strips expiring in October, with six months ahead of them today, are still good. Strips that expired last spring are not. The math is straightforward, but expiration dates are often printed small on a side panel. If you are not certain, text us a photo and we will read it.

A broken seal disqualifies the box

The box has to be sealed. For most major brands, that means the original factory seal has not been broken. An opened box cannot be re-sealed, and there is no way to verify what happened to the strips after opening. This applies even if every strip inside looks untouched.

This is a hard line. A box that was opened to use "just one or two," a box with the shrink wrap cut and re-taped, a box someone opened to count the contents — all disqualified. The seal is not about cleanliness. It is about being able to confirm that what is inside matches what is on the label. Whoever uses those strips downstream needs that certainty, and we cannot offer it once the seal is gone.

Box damage and the quarter rule

Physical damage is where things get more nuanced. Damage bigger than a quarter disqualifies the box. Damage smaller than a quarter may result in a deduction, not a full rejection. That reference is not a precise measurement, but it maps well to what a usable box looks like to someone grading it downstream.

What counts as damage: crushed corners, deep creases, water damage marks, tears in the cardboard. A surface scuff does not count. A slight bend that does not compromise the box structure may not count. A corner that has been folded back and re-flattened probably counts.

• Blood on the box. Even a single dried drop. Immediate no.
• Moisture or water damage. Warping, waterlines, or visible swelling. Immediate no.
• Crushed or torn cardboard bigger than a quarter. Disqualifying.
• Smaller damage. May be a deduction. Send a photo and we will tell you.

Send a photo for any damage question. We see damaged boxes every week and can tell from a clear shot whether something clears the threshold or does not.

Storage conditions that can affect strips before expiration

Test strips are sensitive to heat, humidity, and direct light. Most manufacturers recommend storing them away from direct sunlight, out of high-humidity areas, and away from temperature extremes. Bathroom medicine cabinets are the worst common choice. The CDC's diabetes resources and most brand package inserts both specify the acceptable temperature and humidity range.

For sealed boxes, storage problems are hard to see from the outside. The main visible sign is moisture damage on the cardboard. If the box looks clean, sealed, and structurally sound, storage is rarely the issue. The risk of heat damage on a sealed box stored in a kitchen drawer is much lower than on an opened container left in a hot car.

The scenario where storage actually matters: supplies left in an attic or unconditioned storage unit through several New England summers. Even if the expiration date is ahead, extreme repeated heat cycles can compromise the strips inside. When in doubt, send a photo. We can flag what we see on the outside, and if there is real uncertainty we will say so rather than take a pickup we cannot stand behind.

What "still good" means if you are thinking about selling

For selling, "still good" maps directly to three conditions: sealed, not expired, no significant damage. If all three are true, the strips are eligible. The offer depends on the brand, expiration timeline, and count, but the box clears the eligibility bar. See the full breakdown of when selling makes sense and what the rules are around legality and condition.

One thing worth saying clearly: if you need those strips over the next 30 days, selling is not the right call. The supply runs out before the next refill, and that is not a trade worth making. We only want what you are genuinely not going to use. A real surplus is the inventory we are here for — not a situation where someone needs the cash today and regrets it next week.

Switching to a CGM is the most common surplus scenario

When a doctor moves someone from test strips to a continuous glucose monitor, the leftover strips are usually in perfect shape. They were ordered and delivered like any other refill. Nothing happened to them. They are just no longer needed.

One customer made that switch and had 15 boxes of FreeStyle Lite sitting in the closet. Sealed, good dating, nothing wrong with any of them. We bought the lot. The payout covered the entire CGM co-pay. The switch cost nothing out of pocket, and the strips went to someone who could actually use them. That is the best version of this: supplies that pass every check, going somewhere useful, paying for the upgrade that replaced them.

If you are mid-switch or sitting on supplies from a monitoring method change, the guide on what to do with unused diabetic supplies covers the broader picture. The condition rules are the same regardless of how the surplus happened.

How to get a fast answer before making a trip

Text a photo to (617) 702-2220. Front of the box and the expiration date in the same shot. During business hours (Mon–Sat 9am–6pm, Sun 11am–4pm) you will usually hear back within about 60 minutes with a per-box number.

The photo quote is binding. Whatever we quote off the photo is what you walk away with at the pickup. We do not re-grade once we have the box in our hands. Local pickup is the specialty — Worcester County and 25 miles out, cash in your hand the same day in the core zone. Cash, Cash App, or Venmo, your call.

Check the full price guide for current top payouts on every brand we buy. For a comparison of how local pickup stacks up against sending supplies through the mail, see local vs. mail-in test strip buyback.